nrf5340: Halt on bus fault instead of reset

RE: nrf5340: Halt on bus fault instead of reset

Andrew- — Fri, 16 Feb 2024 16:30:48 GMT

If anyone else has this problem, in a non-secure build you will need to access the non-secure (POWER_NS) version of the register at address 0x40005618ul rather than 0x50005618ul to stop getting a security assert and constant reboot.

RE: nrf5340: Halt on bus fault instead of reset

GerardB — Thu, 04 May 2023 15:56:47 GMT

Hi Mike

We would also like to implement errata 161 on our nrf5340 project (we are using SDK v2.3.0) - but despite this post it is not clear to me how to do this!

Questions for you:

Did you ever resolve this issue (i.e: did it work when you "simply" changed the nrf_reset_h file directly, without changing anything else)?

Would really appreciate your help/feedback.

Thanks!

Gerard

RE: nrf5340: Halt on bus fault instead of reset

Kenneth — Mon, 24 Apr 2023 08:01:43 GMT

[quote user="MikeVM"]Should I leave board.c's initialization alone and just patch nrf_reset.h with the expectation that something is invoking nrf_reset_network_force_off? Confused.[/quote]

Sounds like a good idea. But to understand more about the cause of the error here you can add the following to you application prj.conf:

CONFIG_ASSERT=y
CONFIG_ASSERT_VERBOSE=y
CONFIG_ASSERT_NO_COND_INFO=n
CONFIG_ASSERT_NO_MSG_INFO=n
CONFIG_RESET_ON_FATAL_ERROR=n
CONFIG_THREAD_NAME=y

I suspect the problem is that the code is executed from nonsecure environment, and this cause a security exception that reset the system.

Best regards,
Kenneth

RE: nrf5340: Halt on bus fault instead of reset

Mike Mascari — Fri, 21 Apr 2023 13:47:51 GMT

Hi Kenneth.

Our board initialization code invoked by SYS_INIT at POST_KERNEL was doing:

NRF_RESET->NETWORK.FORCEOFF = RESET_NETWORK_FORCEOFF_FORCEOFF_Release;

When we replaced that with the 161 errata from nrf_reset.h:

	*(volatile uint32_t *)0x50005618UL = 1UL;
        NRF_RESET->NETWORK.FORCEOFF = RESET_NETWORK_FORCEOFF_FORCEOFF_Release <<
	  RESET_NETWORK_FORCEOFF_FORCEOFF_Pos;
        NRFX_DELAY_US(5);
        NRF_RESET->NETWORK.FORCEOFF = RESET_NETWORK_FORCEOFF_FORCEOFF_Hold <<
	  RESET_NETWORK_FORCEOFF_FORCEOFF_Pos;
        NRFX_DELAY_US(1);
        NRF_RESET->NETWORK.FORCEOFF = RESET_NETWORK_FORCEOFF_FORCEOFF_Release <<
	  RESET_NETWORK_FORCEOFF_FORCEOFF_Pos;
        *(volatile uint32_t *)0x50005618UL = 0UL;

the board continually reboots. Should I leave board.c's initialization alone and just patch nrf_reset.h with the expectation that something is invoking nrf_reset_network_force_off? Confused.

- Mike

RE: nrf5340: Halt on bus fault instead of reset

Kenneth — Wed, 19 Apr 2023 09:27:59 GMT

Hello,

Regarding implementing errata 161:
https://infocenter.nordicsemi.com/topic/errata_nRF5340_Rev1/ERR/nRF5340/Rev1/latest/anomaly_340_161.html

The errata says you should replace the following code:

NRF_RESET->NETWORK.FORCEOFF = RESET_NETWORK_FORCEOFF_FORCEOFF_Release;

with the following

*(volatile uint32_t *) 0x50005618ul = 1ul;
NRF_RESET->NETWORK.FORCEOFF = (RESET_NETWORK_FORCEOFF_FORCEOFF_Release << RESET_NETWORK_FORCEOFF_FORCEOFF_Pos);
delay_us(5); // Wait for at least five microseconds
NRF_RESET->NETWORK.FORCEOFF = (RESET_NETWORK_FORCEOFF_FORCEOFF_Hold << RESET_NETWORK_FORCEOFF_FORCEOFF_Pos);
delay_us(1); // Wait for at least one microsecond
NRF_RESET->NETWORK.FORCEOFF = (RESET_NETWORK_FORCEOFF_FORCEOFF_Release << RESET_NETWORK_FORCEOFF_FORCEOFF_Pos);
*(volatile uint32_t *) 0x50005618ul = 0ul;

I can see this require one change, for the board file (will depend on the board you have):
https://github.com/NordicSemiconductor/nrfx/blob/master/hal/nrf_reset.h#L137

Regarding implementing errata 160:
https://infocenter.nordicsemi.com/topic/errata_nRF5340_Rev1/ERR/nRF5340/Rev1/latest/anomaly_340_160.html

I can see this require two changes:
https://github.com/nrfconnect/nrfx/blob/master/mdk/system_nrf5340_application.c#L172
https://github.com/nrfconnect/nrfx/blob/master/mdk/system_nrf5340_network.c#L85

Hope this helps,
Kenneth

RE: nrf5340: Halt on bus fault instead of reset

Mike Mascari — Thu, 13 Apr 2023 12:05:32 GMT

Thank you Kenneth.

I attempted to migrate our app code to the latest nRF Connect SDK, but ran into challenges. Sorry to ask for hand-holding, but could you tell me which files in 1.6.1 should have the code added as specified in the 160 and 161 errata? Not sure exactly where to drop in those lines.

RE: nrf5340: Halt on bus fault instead of reset

Kenneth — Mon, 03 Apr 2023 11:15:52 GMT

Hello,

You are working on a rather old nRF Connect SDK, but please try to implement these two workarounds:
https://infocenter.nordicsemi.com/topic/errata_nRF5340_Rev1/ERR/nRF5340/Rev1/latest/anomaly_340_160.html
https://infocenter.nordicsemi.com/topic/errata_nRF5340_Rev1/ERR/nRF5340/Rev1/latest/anomaly_340_161.html

Best regards,
Kenneth