[Bug report] Unaligned memory acces with Zigbee R23 on nRF54

[Kampino]

How to reproduce:

Generate a production config (content doesn´t care because the error still exists after changing the content) and build / flash it:

nrfutil nrf5sdk-tools zigbee production_config zigbee_config.yml zigbee_config.hex --offset 0x17a000
nrfjprog --program zigbee_config.hex --verify

00> [00:00:44.726,567] <err> os: ***** USAGE FAULT *****
00> [00:00:44.726,573] <err> os:   Unaligned memory access
00> [00:00:44.726,590] <err> os: r0/a1:  0x00000000  r1/a2:  0x00051a8c  r2/a3:  0x0005317c
00> [00:00:44.726,598] <err> os: r3/a4:  0x00000000 r12/ip:  0x00000000 r14/lr:  0x0004088d
00> [00:00:44.726,602] <err> os:  xpsr:  0x69100000
00> [00:00:44.726,612] <err> os: s[ 0]:  0x0005019f  s[ 1]:  0x00000000  s[ 2]:  0x20009300  s[ 3]:  0x000501a5
00> [00:00:44.726,620] <err> os: s[ 4]:  0x0005019f  s[ 5]:  0x0003beed  s[ 6]:  0x500ca000  s[ 7]:  0x00041d77
00> [00:00:44.726,628] <err> os: s[ 8]:  0x000082ed  s[ 9]:  0x00008303  s[10]:  0x00050724  s[11]:  0x000497f7
00> [00:00:44.726,636] <err> os: s[12]:  0x00050614  s[13]:  0x00018a0b  s[14]:  0x00000000  s[15]:  0x00000001
00> [00:00:44.726,641] <err> os: fpscr:  0x00000000
00> [00:00:44.726,645] <err> os: Faulting instruction address (r15/pc): 0x00000000

Behaviour:

During the FIRST reset after flashing the config, this error occurs. After the second rese,t the firmware starts as expected.

Environment:

- Zigbee R23 (latest)
- NCS 2.9.0

[Kampino]

Hi Marte,

please let me try to reproduce it with one of the samples. If it´s successful I will provide you the neccessary steps. If I can´t reproduce it, I will check my code to make sure you can use it out of the box.

Sorry for the issues.

[Kampino]

Hi Marte Myrvold ,

I´ve updated the documentation and the project on GitHub. You should be able to build it now. I´ve tested it in WSL and with an Ubuntu VM and there was no issue. This should help you to reproduce the issue.

[Marte Myrvold]

Hi,

I see that the project is a workspace application and that I need to install the nRF Connect SDK and some additional sensor libraries and patches. Can you share a minimal example where you can reproduce this using the ncs-zigbee SDK without adding additional libraries?

Best regards,
Marte

[Kampino]

Hi Marte Myrvold ,

I´ve compiled the light bulb sample with the following config to make it usable for my board:

# Must be set to "y" because no external 32 kHz crystal is used here
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

CONFIG_GPIO=y
CONFIG_PWM=y

# Make sure printk is not printing to the UART console
CONFIG_LOG=y
CONFIG_LOG_PRINTK=y

CONFIG_DEBUG_OPTIMIZATIONS=y

CONFIG_USE_SEGGER_RTT=y
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_BACKEND_RTT_MODE_BLOCK=y
CONFIG_LOG_BUFFER_SIZE=4096
CONFIG_LOG_BACKEND_RTT_OUTPUT_BUFFER_SIZE=128
CONFIG_LOG_BLOCK_IN_THREAD=y

CONFIG_HEAP_MEM_POOL_SIZE=2048
CONFIG_MAIN_THREAD_PRIORITY=7

CONFIG_ZIGBEE_ADD_ON=y
CONFIG_ZIGBEE_APP_UTILS=y
CONFIG_ZIGBEE_ROLE_ROUTER=y

# Enable DK LED and Buttons library
CONFIG_DK_LIBRARY=y

# This example requires more workqueue stack
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

# Networking
CONFIG_NET_IPV6=n
CONFIG_NET_IP_ADDR_CHECK=n
CONFIG_NET_UDP=n

# Scene extension
CONFIG_ZIGBEE_SCENES=y

I´ve opened an RTT terminal after flashing the Zigbee config file, and I get this output

00> [00:16:18.850,864] <inf> ieee802154_nrf5: nRF5 802154 radio initialized

But I wasn´t able to reproduce the error.

Btw. the error is caused by flash read and sync during the "stream_flash_init" function.

[Vidar Berg]

Hello,

Please try with SDK v2.9.2 and see if you still encounter this fault exception. This bugfix release includes the following fix in MPSL which may lead to the same symptoms you have experienced:

Ref. https://docs.nordicsemi.com/bundle/ncs-2.9.2/page/nrfxlib/mpsl/CHANGELOG.html 

Best regards,

Vidar