diff --git a/miosix/arch/common/drivers/serial_stm32.cpp b/miosix/arch/common/drivers/serial_stm32.cpp
index 4c5448e8fb83e58cfa126bcebbdca011a10bfe6b..422bd1a93e82063ab9da09a26e8ee1f8b40f5b0e 100644
--- a/miosix/arch/common/drivers/serial_stm32.cpp
+++ b/miosix/arch/common/drivers/serial_stm32.cpp
@@ -73,7 +73,7 @@ void __attribute__((noinline)) usart1irqImpl()
 /**
  * \internal interrupt routine for usart1
  */
-void __attribute__((naked)) USART1_IRQHandler()
+void __attribute__((naked, weak)) USART1_IRQHandler()
 {
     saveContext();
     asm volatile("bl _Z13usart1irqImplv");
@@ -93,7 +93,7 @@ void __attribute__((noinline)) usart2irqImpl()
 /**
  * \internal interrupt routine for usart2
  */
-void __attribute__((naked)) USART2_IRQHandler()
+void __attribute__((naked, weak)) USART2_IRQHandler()
 {
     saveContext();
     asm volatile("bl _Z13usart2irqImplv");
@@ -113,14 +113,14 @@ void __attribute__((noinline)) usart3irqImpl()
  * \internal interrupt routine for usart3
  */
 #if !defined(STM32F072xB)
-void __attribute__((naked)) USART3_IRQHandler()
+void __attribute__((naked, weak)) USART3_IRQHandler()
 {
     saveContext();
     asm volatile("bl _Z13usart3irqImplv");
     restoreContext();
 }
 #else  //!defined(STM32F072xB)
-void __attribute__((naked)) USART3_4_IRQHandler()
+void __attribute__((naked, weak)) USART3_4_IRQHandler()
 {
     saveContext();
     asm volatile("bl _Z13usart3irqImplv");
diff --git a/miosix/arch/cortexM0_stm32f0/stm32f072rb_stm32f0discovery/core/stage_1_boot.cpp b/miosix/arch/cortexM0_stm32f0/stm32f072rb_stm32f0discovery/core/stage_1_boot.cpp
index 5186ae08cd19c0bbdd08caa44dfc4060ce23631d..31e682cae039f13c2691f83fb8addbc3bac4999e 100644
--- a/miosix/arch/cortexM0_stm32f0/stm32f072rb_stm32f0discovery/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM0_stm32f0/stm32f072rb_stm32f0discovery/core/stage_1_boot.cpp
@@ -225,8 +225,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_4_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_4_IRQHandler = Default_Handler
 #pragma weak CEC_CAN_IRQHandler = Default_Handler
 #pragma weak USB_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f100c8_microboard/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f100c8_microboard/core/stage_1_boot.cpp
index daa7dbf6bbce7e2e1286d3ce48a6b323d2799acc..dd99c7e350a3680cb956154f083c98611f23fb20 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f100c8_microboard/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f100c8_microboard/core/stage_1_boot.cpp
@@ -271,9 +271,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTCAlarm_IRQHandler = Default_Handler
 #pragma weak CEC_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f100c8_vaisala_rs41/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f100c8_vaisala_rs41/core/stage_1_boot.cpp
index daa7dbf6bbce7e2e1286d3ce48a6b323d2799acc..dd99c7e350a3680cb956154f083c98611f23fb20 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f100c8_vaisala_rs41/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f100c8_vaisala_rs41/core/stage_1_boot.cpp
@@ -271,9 +271,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTCAlarm_IRQHandler = Default_Handler
 #pragma weak CEC_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f100cb_tempsensor/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f100cb_tempsensor/core/stage_1_boot.cpp
index daa7dbf6bbce7e2e1286d3ce48a6b323d2799acc..dd99c7e350a3680cb956154f083c98611f23fb20 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f100cb_tempsensor/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f100cb_tempsensor/core/stage_1_boot.cpp
@@ -271,9 +271,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTCAlarm_IRQHandler = Default_Handler
 #pragma weak CEC_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f100cx_generic/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f100cx_generic/core/stage_1_boot.cpp
index daa7dbf6bbce7e2e1286d3ce48a6b323d2799acc..dd99c7e350a3680cb956154f083c98611f23fb20 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f100cx_generic/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f100cx_generic/core/stage_1_boot.cpp
@@ -271,9 +271,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTCAlarm_IRQHandler = Default_Handler
 #pragma weak CEC_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f100rb_stm32vldiscovery/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f100rb_stm32vldiscovery/core/stage_1_boot.cpp
index daa7dbf6bbce7e2e1286d3ce48a6b323d2799acc..dd99c7e350a3680cb956154f083c98611f23fb20 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f100rb_stm32vldiscovery/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f100rb_stm32vldiscovery/core/stage_1_boot.cpp
@@ -271,9 +271,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTCAlarm_IRQHandler = Default_Handler
 #pragma weak CEC_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f100rc_solertegiard/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f100rc_solertegiard/core/stage_1_boot.cpp
index ff4624415bf0b0ce7e7ccc164e61338f404657cc..13fb3fff969643cacbeecc1462d53867fcae810a 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f100rc_solertegiard/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f100rc_solertegiard/core/stage_1_boot.cpp
@@ -289,9 +289,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak CEC_IRQHandler = Default_Handler
@@ -300,8 +300,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak TIM14_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Channel1_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f103c8_breakout/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f103c8_breakout/core/stage_1_boot.cpp
index b763b45c1ce04d700885262a897fe339510af462..1a9d3165f45a8a2a971cc60515af91ad304de5de 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f103c8_breakout/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f103c8_breakout/core/stage_1_boot.cpp
@@ -261,9 +261,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak USBWakeUp_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f103cb_als_mainboard_rev2/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f103cb_als_mainboard_rev2/core/stage_1_boot.cpp
index 7c8cba6c189220d7f0dd2abaa03ae1faca67d48b..7a188a258cd858b8ce1e3e29a9b364e1baba63db 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f103cb_als_mainboard_rev2/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f103cb_als_mainboard_rev2/core/stage_1_boot.cpp
@@ -262,9 +262,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTCAlarm_IRQHandler = Default_Handler
 #pragma weak USBWakeUp_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f103cx_generic/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f103cx_generic/core/stage_1_boot.cpp
index 7c8cba6c189220d7f0dd2abaa03ae1faca67d48b..7a188a258cd858b8ce1e3e29a9b364e1baba63db 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f103cx_generic/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f103cx_generic/core/stage_1_boot.cpp
@@ -262,9 +262,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTCAlarm_IRQHandler = Default_Handler
 #pragma weak USBWakeUp_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f103ve_mp3v2/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f103ve_mp3v2/core/stage_1_boot.cpp
index d1f91b32fc4efa4a7e334af58a8f88ff0edb59c4..4da9c2d7af2f5a75a10fc4491ac10cf68a1d652f 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f103ve_mp3v2/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f103ve_mp3v2/core/stage_1_boot.cpp
@@ -323,9 +323,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTCAlarm_IRQHandler = Default_Handler
 #pragma weak USBWakeUp_IRQHandler = Default_Handler
@@ -338,8 +338,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Channel1_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f103ve_strive_mini/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f103ve_strive_mini/core/stage_1_boot.cpp
index c73356cdbfebb0de8c6cb78c65dabc5e6be69249..4e8d5096227ff5bbbb6e05c5527b8d6a5652b6ef 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f103ve_strive_mini/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f103ve_strive_mini/core/stage_1_boot.cpp
@@ -331,9 +331,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTCAlarm_IRQHandler = Default_Handler
 #pragma weak USBWakeUp_IRQHandler = Default_Handler
@@ -346,8 +346,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Channel1_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f103ze_redbull_v2/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f103ze_redbull_v2/core/stage_1_boot.cpp
index f388462c91e88df63bd64a2125ed2e0d83de31f5..0473ff256f0fd8653af12ee74c6cd6b28969718e 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f103ze_redbull_v2/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f103ze_redbull_v2/core/stage_1_boot.cpp
@@ -337,9 +337,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTCAlarm_IRQHandler = Default_Handler
 #pragma weak USBWakeUp_IRQHandler = Default_Handler
@@ -352,8 +352,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Channel1_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f1/stm32f103ze_stm3210e-eval/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f1/stm32f103ze_stm3210e-eval/core/stage_1_boot.cpp
index e789ff762e2e9ad71a6ec4d0ecd2da04281f73d3..4ebcfd5ab03553a0124a557d2e74aed8588474a3 100644
--- a/miosix/arch/cortexM3_stm32f1/stm32f103ze_stm3210e-eval/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f1/stm32f103ze_stm3210e-eval/core/stage_1_boot.cpp
@@ -341,9 +341,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTCAlarm_IRQHandler = Default_Handler
 #pragma weak USBWakeUp_IRQHandler = Default_Handler
@@ -356,8 +356,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Channel1_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f2/stm32f205_generic/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f2/stm32f205_generic/core/stage_1_boot.cpp
index a9a04045b70c657de8e75b1c9ac1d78799b31d6a..39e54beb5a96417c92a5eddd50899d0f519a74a3 100644
--- a/miosix/arch/cortexM3_stm32f2/stm32f205_generic/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f2/stm32f205_generic/core/stage_1_boot.cpp
@@ -366,9 +366,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -381,8 +381,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -400,7 +400,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f2/stm32f205rc_skyward_stormtrooper/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f2/stm32f205rc_skyward_stormtrooper/core/stage_1_boot.cpp
index e4d867df5998d8d7659ecc4b7d981f0b70b96f26..182b77ff60369402ff946166d2f6af90519cb349 100644
--- a/miosix/arch/cortexM3_stm32f2/stm32f205rc_skyward_stormtrooper/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f2/stm32f205rc_skyward_stormtrooper/core/stage_1_boot.cpp
@@ -335,9 +335,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -350,8 +350,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -367,7 +367,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f2/stm32f205rg_sony-newman/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f2/stm32f205rg_sony-newman/core/stage_1_boot.cpp
index da001959af756fde10132a251ee450288717926d..8a3c130c8a9e401ecb46d0eaccc35bd2f10c5ec9 100644
--- a/miosix/arch/cortexM3_stm32f2/stm32f205rg_sony-newman/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f2/stm32f205rg_sony-newman/core/stage_1_boot.cpp
@@ -339,9 +339,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -354,8 +354,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -373,7 +373,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f2/stm32f207ig_stm3220g-eval/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f2/stm32f207ig_stm3220g-eval/core/stage_1_boot.cpp
index a9a04045b70c657de8e75b1c9ac1d78799b31d6a..39e54beb5a96417c92a5eddd50899d0f519a74a3 100644
--- a/miosix/arch/cortexM3_stm32f2/stm32f207ig_stm3220g-eval/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f2/stm32f207ig_stm3220g-eval/core/stage_1_boot.cpp
@@ -366,9 +366,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -381,8 +381,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -400,7 +400,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f2/stm32f207ze_als_camboard/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f2/stm32f207ze_als_camboard/core/stage_1_boot.cpp
index 98b941e138675aa9139d0c9630ed32a4efc31dd6..13cc1c60f1ed1fed5d5636c01cf6f8aa326a269f 100644
--- a/miosix/arch/cortexM3_stm32f2/stm32f207ze_als_camboard/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f2/stm32f207ze_als_camboard/core/stage_1_boot.cpp
@@ -364,9 +364,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -379,8 +379,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -398,7 +398,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f2/stm32f207zg_EthBoardV2/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f2/stm32f207zg_EthBoardV2/core/stage_1_boot.cpp
index 98b941e138675aa9139d0c9630ed32a4efc31dd6..13cc1c60f1ed1fed5d5636c01cf6f8aa326a269f 100644
--- a/miosix/arch/cortexM3_stm32f2/stm32f207zg_EthBoardV2/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f2/stm32f207zg_EthBoardV2/core/stage_1_boot.cpp
@@ -364,9 +364,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -379,8 +379,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -398,7 +398,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32f2/stm32f207zg_nucleo/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32f2/stm32f207zg_nucleo/core/stage_1_boot.cpp
index ccf892d3d0808ee2b10739674f3c9c999f7da026..c82dd4852011f16e10d91718f124e2c9b5b2771b 100644
--- a/miosix/arch/cortexM3_stm32f2/stm32f207zg_nucleo/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32f2/stm32f207zg_nucleo/core/stage_1_boot.cpp
@@ -366,9 +366,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -381,8 +381,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -400,7 +400,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM3_stm32l1/stm32l151c8_als_mainboard/core/stage_1_boot.cpp b/miosix/arch/cortexM3_stm32l1/stm32l151c8_als_mainboard/core/stage_1_boot.cpp
index 3a5277349eb77b28eba7fc4e332a3f736494db5d..edb253c4d37ab7ee70292ab64983a8574df57db2 100644
--- a/miosix/arch/cortexM3_stm32l1/stm32l151c8_als_mainboard/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM3_stm32l1/stm32l151c8_als_mainboard/core/stage_1_boot.cpp
@@ -274,9 +274,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak USB_FS_WKUP_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_atsam4l/atsam4lc2aa_generic/core/stage_1_boot.cpp b/miosix/arch/cortexM4_atsam4l/atsam4lc2aa_generic/core/stage_1_boot.cpp
index 4b2d5468ff64db3907223440bab3408347d3305c..290b503872b8b45f81428e8ad67dea793074bfbb 100644
--- a/miosix/arch/cortexM4_atsam4l/atsam4lc2aa_generic/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_atsam4l/atsam4lc2aa_generic/core/stage_1_boot.cpp
@@ -360,9 +360,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak TWIM1_Handler = Default_Handler
 #pragma weak TWIS1_Handler = Default_Handler
 #pragma weak USART0_Handler = Default_Handler
-#pragma weak USART1_Handler = Default_Handler
-#pragma weak USART2_Handler = Default_Handler
-#pragma weak USART3_Handler = Default_Handler
+// #pragma weak USART1_Handler = Default_Handler
+// #pragma weak USART2_Handler = Default_Handler
+// #pragma weak USART3_Handler = Default_Handler
 #pragma weak ADCIFE_Handler = Default_Handler
 #pragma weak DACC_Handler = Default_Handler
 #pragma weak ACIFC_Handler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f3/stm32f303vc_stm32f3discovery/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f3/stm32f303vc_stm32f3discovery/core/stage_1_boot.cpp
index e544d2abdea830386596d7a04b6cd5d69eb8b619..6ddde0068262fdbd2bb72becc8e5a47af5c6663d 100644
--- a/miosix/arch/cortexM4_stm32f3/stm32f303vc_stm32f3discovery/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f3/stm32f303vc_stm32f3discovery/core/stage_1_boot.cpp
@@ -320,9 +320,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak USBWakeUp_IRQHandler = Default_Handler
@@ -332,8 +332,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak TIM8_CC_IRQHandler = Default_Handler
 #pragma weak ADC3_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Channel1_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f4/stm32f401re_nucleo/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f4/stm32f401re_nucleo/core/stage_1_boot.cpp
index 9c2b18f8913cbe401f90c014ac54d9c3f2edc536..aed21829b021cbf3355e68d0916a2a2269751a4d 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f401re_nucleo/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f401re_nucleo/core/stage_1_boot.cpp
@@ -306,8 +306,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -324,7 +324,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f4/stm32f401vc_stm32f4discovery/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f4/stm32f401vc_stm32f4discovery/core/stage_1_boot.cpp
index e357cb5e84a777364b9749eaf1a2045e71177cbb..b5e0dcb614b215402d359318e0810abe203ac53f 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f401vc_stm32f4discovery/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f401vc_stm32f4discovery/core/stage_1_boot.cpp
@@ -306,8 +306,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -324,7 +324,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f4/stm32f407vg_bitsboard/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f4/stm32f407vg_bitsboard/core/stage_1_boot.cpp
index 9af45b2dab6b7ff30e445ebdbbc47cec0f959ec8..f4b99aec1770a7f32118cdc857799c661e494027 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f407vg_bitsboard/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f407vg_bitsboard/core/stage_1_boot.cpp
@@ -333,9 +333,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -348,8 +348,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -367,7 +367,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f4/stm32f407vg_stm32f4discovery/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f4/stm32f407vg_stm32f4discovery/core/stage_1_boot.cpp
index 41405d27bd2f25326ba14bbfd117bd55d50107a7..58feb9c19c27df4c825f5f389dbf04077a68fec7 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f407vg_stm32f4discovery/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f407vg_stm32f4discovery/core/stage_1_boot.cpp
@@ -332,9 +332,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -347,8 +347,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -366,7 +366,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f4/stm32f407vg_thermal_test_chip/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f4/stm32f407vg_thermal_test_chip/core/stage_1_boot.cpp
index c9c3030501b9a64f2dad451b5e9780a08b0eba7a..5224b072bb394c88e6dc7492f8ae1c94fba62362 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f407vg_thermal_test_chip/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f407vg_thermal_test_chip/core/stage_1_boot.cpp
@@ -333,9 +333,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -348,8 +348,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -367,7 +367,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f4/stm32f411ce_blackpill/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f4/stm32f411ce_blackpill/core/stage_1_boot.cpp
index 1c6ea2b3defe3b36afcb6cc90c3ee53bbc7d3d94..fc38f1b32f3c9794c1842209fff3e93981f0fa39 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f411ce_blackpill/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f411ce_blackpill/core/stage_1_boot.cpp
@@ -308,8 +308,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -326,7 +326,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f4/stm32f411re_nucleo/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f4/stm32f411re_nucleo/core/stage_1_boot.cpp
index 1c6ea2b3defe3b36afcb6cc90c3ee53bbc7d3d94..fc38f1b32f3c9794c1842209fff3e93981f0fa39 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f411re_nucleo/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f411re_nucleo/core/stage_1_boot.cpp
@@ -308,8 +308,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -326,7 +326,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f4/stm32f429zi_oledboard2/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f4/stm32f429zi_oledboard2/core/stage_1_boot.cpp
index c4d44696b753f7b640b88fef6e60305a869c5cf8..d3a2f52b44e80c89580569a35eec28d7fe934cae 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f429zi_oledboard2/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f429zi_oledboard2/core/stage_1_boot.cpp
@@ -358,9 +358,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -373,8 +373,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -392,7 +392,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
@@ -403,8 +403,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak CRYP_IRQHandler = Default_Handler
 #pragma weak HASH_RNG_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
-#pragma weak UART7_IRQHandler = Default_Handler
-#pragma weak UART8_IRQHandler = Default_Handler
+// #pragma weak UART7_IRQHandler = Default_Handler
+// #pragma weak UART8_IRQHandler = Default_Handler
 #pragma weak SPI4_IRQHandler = Default_Handler
 #pragma weak SPI5_IRQHandler = Default_Handler
 #pragma weak SPI6_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f4/stm32f429zi_skyward_anakin/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f4/stm32f429zi_skyward_anakin/core/stage_1_boot.cpp
index c4d44696b753f7b640b88fef6e60305a869c5cf8..d3a2f52b44e80c89580569a35eec28d7fe934cae 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f429zi_skyward_anakin/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f429zi_skyward_anakin/core/stage_1_boot.cpp
@@ -358,9 +358,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -373,8 +373,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -392,7 +392,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
@@ -403,8 +403,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak CRYP_IRQHandler = Default_Handler
 #pragma weak HASH_RNG_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
-#pragma weak UART7_IRQHandler = Default_Handler
-#pragma weak UART8_IRQHandler = Default_Handler
+// #pragma weak UART7_IRQHandler = Default_Handler
+// #pragma weak UART8_IRQHandler = Default_Handler
 #pragma weak SPI4_IRQHandler = Default_Handler
 #pragma weak SPI5_IRQHandler = Default_Handler
 #pragma weak SPI6_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f4/stm32f429zi_skyward_homeone/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f4/stm32f429zi_skyward_homeone/core/stage_1_boot.cpp
index c4d44696b753f7b640b88fef6e60305a869c5cf8..d3a2f52b44e80c89580569a35eec28d7fe934cae 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f429zi_skyward_homeone/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f429zi_skyward_homeone/core/stage_1_boot.cpp
@@ -358,9 +358,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -373,8 +373,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -392,7 +392,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
@@ -403,8 +403,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak CRYP_IRQHandler = Default_Handler
 #pragma weak HASH_RNG_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
-#pragma weak UART7_IRQHandler = Default_Handler
-#pragma weak UART8_IRQHandler = Default_Handler
+// #pragma weak UART7_IRQHandler = Default_Handler
+// #pragma weak UART8_IRQHandler = Default_Handler
 #pragma weak SPI4_IRQHandler = Default_Handler
 #pragma weak SPI5_IRQHandler = Default_Handler
 #pragma weak SPI6_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f4/stm32f429zi_stm32f4discovery/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f4/stm32f429zi_stm32f4discovery/core/stage_1_boot.cpp
index c4d44696b753f7b640b88fef6e60305a869c5cf8..d3a2f52b44e80c89580569a35eec28d7fe934cae 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f429zi_stm32f4discovery/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f429zi_stm32f4discovery/core/stage_1_boot.cpp
@@ -358,9 +358,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -373,8 +373,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -392,7 +392,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
@@ -403,8 +403,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak CRYP_IRQHandler = Default_Handler
 #pragma weak HASH_RNG_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
-#pragma weak UART7_IRQHandler = Default_Handler
-#pragma weak UART8_IRQHandler = Default_Handler
+// #pragma weak UART7_IRQHandler = Default_Handler
+// #pragma weak UART8_IRQHandler = Default_Handler
 #pragma weak SPI4_IRQHandler = Default_Handler
 #pragma weak SPI5_IRQHandler = Default_Handler
 #pragma weak SPI6_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32f4/stm32f469ni_stm32f469i-disco/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32f4/stm32f469ni_stm32f469i-disco/core/stage_1_boot.cpp
index b1e43630b7b8a80729958174f015e4cd7e8de317..b5751e429ebc2dc7b72a4796c6135e593846cda6 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f469ni_stm32f469i-disco/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f469ni_stm32f469i-disco/core/stage_1_boot.cpp
@@ -360,9 +360,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -375,8 +375,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDIO_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -394,7 +394,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
@@ -404,8 +404,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DCMI_IRQHandler = Default_Handler
 #pragma weak HASH_RNG_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
-#pragma weak UART7_IRQHandler = Default_Handler
-#pragma weak UART8_IRQHandler = Default_Handler
+// #pragma weak UART7_IRQHandler = Default_Handler
+// #pragma weak UART8_IRQHandler = Default_Handler
 #pragma weak SPI4_IRQHandler = Default_Handler
 #pragma weak SPI5_IRQHandler = Default_Handler
 #pragma weak SPI6_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32l4/stm32l476rg_nucleo/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32l4/stm32l476rg_nucleo/core/stage_1_boot.cpp
index 65e95347ef9346b04a03a96bfcaf85e7474e53b7..793a25ec2c43941b9d7ec8f72b4e84e362eecc8f 100644
--- a/miosix/arch/cortexM4_stm32l4/stm32l476rg_nucleo/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32l4/stm32l476rg_nucleo/core/stage_1_boot.cpp
@@ -332,9 +332,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak DFSDM1_FLT3_IRQHandler = Default_Handler
@@ -347,8 +347,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDMMC1_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Channel1_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM4_stm32l4/stm32l4r9zi_sensortile/core/stage_1_boot.cpp b/miosix/arch/cortexM4_stm32l4/stm32l4r9zi_sensortile/core/stage_1_boot.cpp
index 5664ef3bcdbec953ef81bb3300793f514a5b1323..c6714d0cf2bfe61ea2d6ce771aed895e6ebe6a9d 100644
--- a/miosix/arch/cortexM4_stm32l4/stm32l4r9zi_sensortile/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM4_stm32l4/stm32l4r9zi_sensortile/core/stage_1_boot.cpp
@@ -353,9 +353,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak DFSDM1_FLT3_IRQHandler = Default_Handler
@@ -367,8 +367,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDMMC1_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Channel1_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM7_stm32f7/stm32f746zg_nucleo/core/stage_1_boot.cpp b/miosix/arch/cortexM7_stm32f7/stm32f746zg_nucleo/core/stage_1_boot.cpp
index 79d1483ff1eb4954355ff732a61b5ef183db549b..f2c6c94759d7c426cd3e99cd3497f98eb3faee8d 100644
--- a/miosix/arch/cortexM7_stm32f7/stm32f746zg_nucleo/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM7_stm32f7/stm32f746zg_nucleo/core/stage_1_boot.cpp
@@ -367,9 +367,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -382,8 +382,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDMMC1_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -401,7 +401,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
@@ -411,8 +411,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DCMI_IRQHandler = Default_Handler
 #pragma weak RNG_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
-#pragma weak UART7_IRQHandler = Default_Handler
-#pragma weak UART8_IRQHandler = Default_Handler
+// #pragma weak UART7_IRQHandler = Default_Handler
+// #pragma weak UART8_IRQHandler = Default_Handler
 #pragma weak SPI4_IRQHandler = Default_Handler
 #pragma weak SPI5_IRQHandler = Default_Handler
 #pragma weak SPI6_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM7_stm32f7/stm32f767zi_nucleo/core/stage_1_boot.cpp b/miosix/arch/cortexM7_stm32f7/stm32f767zi_nucleo/core/stage_1_boot.cpp
index edb932de79b56a07b928749ee5e63ae0d6e0e5d4..6895956377aa78b2d1533ee1209c21a9f91c10e3 100644
--- a/miosix/arch/cortexM7_stm32f7/stm32f767zi_nucleo/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM7_stm32f7/stm32f767zi_nucleo/core/stage_1_boot.cpp
@@ -396,9 +396,9 @@ void (*const __Vectors[])() __attribute__((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -411,8 +411,8 @@ void (*const __Vectors[])() __attribute__((section(".isr_vector"))) =
 #pragma weak SDMMC1_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -430,7 +430,7 @@ void (*const __Vectors[])() __attribute__((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
@@ -441,8 +441,8 @@ void (*const __Vectors[])() __attribute__((section(".isr_vector"))) =
 #pragma weak CRYP_IRQHandler = Default_Handler
 #pragma weak RNG_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
-#pragma weak UART7_IRQHandler = Default_Handler
-#pragma weak UART8_IRQHandler = Default_Handler
+// #pragma weak UART7_IRQHandler = Default_Handler
+// #pragma weak UART8_IRQHandler = Default_Handler
 #pragma weak SPI4_IRQHandler = Default_Handler
 #pragma weak SPI5_IRQHandler = Default_Handler
 #pragma weak SPI6_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM7_stm32f7/stm32f769ni_discovery/core/stage_1_boot.cpp b/miosix/arch/cortexM7_stm32f7/stm32f769ni_discovery/core/stage_1_boot.cpp
index ae2ecdedb2cb1c9ce2a669e280547ccd8a8b2824..e8ba2135fd061159b5982b7f38fe48ab0b108673 100644
--- a/miosix/arch/cortexM7_stm32f7/stm32f769ni_discovery/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM7_stm32f7/stm32f769ni_discovery/core/stage_1_boot.cpp
@@ -406,9 +406,9 @@ void (*const __Vectors[])() __attribute__((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak OTG_FS_WKUP_IRQHandler = Default_Handler
@@ -421,8 +421,8 @@ void (*const __Vectors[])() __attribute__((section(".isr_vector"))) =
 #pragma weak SDMMC1_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -440,7 +440,7 @@ void (*const __Vectors[])() __attribute__((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
@@ -451,8 +451,8 @@ void (*const __Vectors[])() __attribute__((section(".isr_vector"))) =
 #pragma weak CRYP_IRQHandler = Default_Handler
 #pragma weak RNG_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
-#pragma weak UART7_IRQHandler = Default_Handler
-#pragma weak UART8_IRQHandler = Default_Handler
+// #pragma weak UART7_IRQHandler = Default_Handler
+// #pragma weak UART8_IRQHandler = Default_Handler
 #pragma weak SPI4_IRQHandler = Default_Handler
 #pragma weak SPI5_IRQHandler = Default_Handler
 #pragma weak SPI6_IRQHandler = Default_Handler
diff --git a/miosix/arch/cortexM7_stm32h7/stm32h753xi_eval/core/stage_1_boot.cpp b/miosix/arch/cortexM7_stm32h7/stm32h753xi_eval/core/stage_1_boot.cpp
index 0f1c89a9f5a30fda61feff83129734a5d5889860..b595020c23886e04e4db8850cdfe9d1dde36e515 100644
--- a/miosix/arch/cortexM7_stm32h7/stm32h753xi_eval/core/stage_1_boot.cpp
+++ b/miosix/arch/cortexM7_stm32h7/stm32h753xi_eval/core/stage_1_boot.cpp
@@ -463,9 +463,9 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak I2C2_ER_IRQHandler = Default_Handler
 #pragma weak SPI1_IRQHandler = Default_Handler
 #pragma weak SPI2_IRQHandler = Default_Handler
-#pragma weak USART1_IRQHandler = Default_Handler
-#pragma weak USART2_IRQHandler = Default_Handler
-#pragma weak USART3_IRQHandler = Default_Handler
+// #pragma weak USART1_IRQHandler = Default_Handler
+// #pragma weak USART2_IRQHandler = Default_Handler
+// #pragma weak USART3_IRQHandler = Default_Handler
 #pragma weak EXTI15_10_IRQHandler = Default_Handler
 #pragma weak RTC_Alarm_IRQHandler = Default_Handler
 #pragma weak TIM8_BRK_TIM12_IRQHandler = Default_Handler
@@ -477,8 +477,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak SDMMC1_IRQHandler = Default_Handler
 #pragma weak TIM5_IRQHandler = Default_Handler
 #pragma weak SPI3_IRQHandler = Default_Handler
-#pragma weak UART4_IRQHandler = Default_Handler
-#pragma weak UART5_IRQHandler = Default_Handler
+// #pragma weak UART4_IRQHandler = Default_Handler
+// #pragma weak UART5_IRQHandler = Default_Handler
 #pragma weak TIM6_DAC_IRQHandler = Default_Handler
 #pragma weak TIM7_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream0_IRQHandler = Default_Handler
@@ -492,7 +492,7 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak DMA2_Stream5_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream6_IRQHandler = Default_Handler
 #pragma weak DMA2_Stream7_IRQHandler = Default_Handler
-#pragma weak USART6_IRQHandler = Default_Handler
+// #pragma weak USART6_IRQHandler = Default_Handler
 #pragma weak I2C3_EV_IRQHandler = Default_Handler
 #pragma weak I2C3_ER_IRQHandler = Default_Handler
 #pragma weak OTG_HS_EP1_OUT_IRQHandler = Default_Handler
@@ -503,8 +503,8 @@ void (* const __Vectors[])() __attribute__ ((section(".isr_vector"))) =
 #pragma weak CRYP_IRQHandler = Default_Handler
 #pragma weak HASH_RNG_IRQHandler = Default_Handler
 #pragma weak FPU_IRQHandler = Default_Handler
-#pragma weak UART7_IRQHandler = Default_Handler
-#pragma weak UART8_IRQHandler = Default_Handler
+// #pragma weak UART7_IRQHandler = Default_Handler
+// #pragma weak UART8_IRQHandler = Default_Handler
 #pragma weak SPI4_IRQHandler = Default_Handler
 #pragma weak SPI5_IRQHandler = Default_Handler
 #pragma weak SPI6_IRQHandler = Default_Handler