Preserving reset reason with NRF bootloader (SDK15.2)

RE: Preserving reset reason with NRF bootloader (SDK15.2)

Cory Klopotic — Tue, 14 Apr 2020 16:35:00 GMT

Thanks for this post, it quickly help me locate the same issue. Not sure if Nordic did some changes in the SDK (I'm using 15.3). That same line of code was on line 239 and was wrapped inside of an IF statement. I was able to work around this issue without modifying the SDK Files. I just had to go into the sdk_config.h file and UNCHECK the "NRF_BL_APP_CRC_CHECK_SKIPPED_ON_SYSTEMOFF_RESET" option (located under nRF_Bootloader>>nrf_bootloader - Bootloader settings>>Application integrity checks.

RE: Preserving reset reason with NRF bootloader (SDK15.2)

Nathan Morsa — Tue, 16 Jul 2019 13:43:10 GMT

Hello Israel,

Unless I'm mistaken, you can indeed read and write to the RESETREAS register. But this was not a solution to this problem.

Here is the patch I applied:

--- a/components/libraries/bootloader/nrf_bootloader.c	Tue Oct 30 13:29:35 2018 +0100
+++ b/components/libraries/bootloader/nrf_bootloader.c	Tue Feb 05 18:06:54 2019 +0100
@@ -228,7 +228,7 @@
     if (NRF_BL_APP_CRC_CHECK_SKIPPED_ON_SYSTEMOFF_RESET &&
         (nrf_power_resetreas_get() & NRF_POWER_RESETREAS_OFF_MASK))
     {
-        nrf_power_resetreas_clear(NRF_POWER_RESETREAS_OFF_MASK);
+        //nrf_power_resetreas_clear(NRF_POWER_RESETREAS_OFF_MASK);
         ret = false;
     }
     else if (NRF_BL_APP_CRC_CHECK_SKIPPED_ON_GPREGRET2 &&

By reading then clearing it in the application, I have not encountered any side-effect since then.

RE: Preserving reset reason with NRF bootloader (SDK15.2)

Israel — Tue, 16 Jul 2019 11:58:02 GMT

Hello Nathan,

What do you mean by saving and restoring the content of RESETREAS? To my understanding you cannot write back to RESETREAS, writing a '1' its what actually clears the register.....

I am having the same issue as you describe, did you just left the line nrf_power_resetreas_clear(NRF_POWER_RESETREAS_OFF_MASK); commented out?

Does anyone know why the NRF Bootloader clears the reset reason in the first place?

RE: Preserving reset reason with NRF bootloader (SDK15.2)

Marjeris Romero — Wed, 06 Feb 2019 14:07:30 GMT

Hi Nathan,

I don't think it will be a problem if you modify the SDK library as long as you do the clear in the application (main.c).

Best Regards,

Marjeris