topic Hardfault handler log saving in i.MX RT Crossover MCUs

Hardfault handler log saving

Seongyon_Jeong — Wed, 12 Mar 2025 06:35:59 GMT

I.MXRT1020-EVK board. MCUXpressoIDE 24.12 , SDK_2.x_EVK-MIMXRT1020 2.13.0

When hardfault occurred, I tried to move the previously logged content to flash.

This coding-job was based on an example that included Shell among an example using FreeRTOS.

1. fsl_debug_console.c

Before delivering the printbuffer to the DbgConsole_Vprintf function, we delivered the same content to the ringbuffer allocated 8KB using pvMalloc so that it can be stored continuously.

2. semihost_hardfault.c

In this function, if it is not under the _semihost_return condition of the existing code, jump to a function called hardfault_handler_main in BL.

Hardfault_handler_main call hardfault_log_save_sc.

In hardfault_log_save_sc, the logs in the area 8KB assigned to the malloc defined in fsl_debug_console.c were sorted so that they were stored in the 3F0 and 3F1 sectors of flash from the very first log.
In RT1020, the 3F0 sector number of flash corresponds to 0x603F_0000 .

The reason why I'm posting the question here is. After creating a trigger_hardfault CMD command and function that deliberately attempts to write a value to the null point in the shell
volatile int *ptr = (int *)0x00000000; // NULL pointer
*ptr = 42; // trigger hardfault

If intentionally causing hardfault.

Ease the first sector of hardfault_log_save_sc is successfully executed, but then the second sector erase and dump to Dram -> flash do not work.

How do I fix the file semihost_hardfault.c for hardfault handlers in SDK so that I can write what's in DRAM in flash correctly and fall out indefinitely?

Re: Hardfault handler log saving

Seongyon_Jeong — Wed, 12 Mar 2025 06:42:33 GMT

Ease the first sector of hardfault_log_save_sc is successfully executed

=> Erasing the first sector of hardfault_log_save_sc is successfully executed

Miss spelling..

Re: Hardfault handler log saving

Sam_Gao — Wed, 12 Mar 2025 08:55:36 GMT

Hi @Seongyon_Jeong

It seems there are some issues about hardFault handle which are developed from your side. Generally speaking, it is out of our support role.

Here I would like to give advice that it's hard to handle flash sections, please follow flash_componment_nor_flexspi example to see how to use Nor_Flash_Erase_Sector Nor_Flash_Read functions.

Re: flash component project

Seongyon_Jeong — Thu, 13 Mar 2025 08:27:33 GMT

This is my SDK version for RT1020 EVK

I download two example from SDK

freertos_hello_flash_operation works fine.

But flash component nor is not.

Just Only , Import SDK example -> select this example -> finish (no change, just default)
But. Build & Download the image Using GUI Flash Tool of MCUXpressoIDE. ,

and. Nothing....... so, I Enter debug mode of this project.

then....

I do not change anything in this project. just import & build & down.

but this faced to Hardfault directly.....

So, I tested another project, they work fine with Default SDK Example Project state.

I think the Example project has problem

Re: flash component project

Sam_Gao — Thu, 13 Mar 2025 09:15:15 GMT

Hi @Seongyon_Jeong

I used the latest SDK(v24.12 or v2.16.0) which need IDE v24 to run the same example (evkmimxrt1020_flash_component_nor_flexspi), but both of them all works fine.

Please double check from your side.

https://github.com/nxp-mcuxpresso/mcux-sdk-examples/tree/5a158afe9cdb70ca449667ed71490afd29655710/evkmimxrt1020/component_examples/flash_component/flexspi_nor

***NOR Flash Component Demo Start!*** ***NOR Flash Page 0 Read/Write Success!*** ***NOR Flash Page 1 Read/Write Success!*** ***NOR Flash Page 2 Read/Write Success!*** ***NOR Flash Page 3 Read/Write Success!*** ***NOR Flash Page 4 Read/Write Success!*** ***NOR Flash Page 5 Read/Write Success!*** ***NOR Flash Page 6 Read/Write Success!*** ***NOR Flash Page 7 Read/Write Success!*** ***NOR Flash Page 8 Read/Write Success!*** ***NOR Flash Page 9 Read/Write Success!*** ***NOR Flash Page 10 Read/Write Success!*** ***NOR Flash Page 11 Read/Write Success!*** ***NOR Flash Page 12 Read/Write Success!*** ***NOR Flash Page 13 Read/Write Success!*** ***NOR Flash Page 14 Read/Write Success!*** ***NOR Flash Page 15 Read/Write Success!*** ***NOR Flash All Pages Read/Write Success!***

Re: flash component project

Seongyon_Jeong — Fri, 14 Mar 2025 02:38:59 GMT

I did double checks. but Still hardfault occures
But I change SDK version or RT1020... SDK 2.13 -> SDK 24.12 then It works fine

After comparing two version with diff sw tool,
Now I guess , previous SDK version Example has problem.

anyway. thanks for your f/up