nrf52840-DK device fails to boot with Unaligned memory access error

[Anupam Roy]

Hi,

Problem: nrfconnect  device fails to boot with Unaligned memory access error

• expected behavior: nRF52840-DK chip device should boot normally

• actual behavior: nRF52840-DK chip device fails to boot normally and keeps continuously re-booting with Unaligned memory access error

• steps to reproduce:
  1. build connectedhomeip/examples/lock-app/nrfconnect for nRF52840-DK board
  2. Flash zephyr.hex file in nRF52840-DK with nRF Connect v3.5.0 Windows application
  3. Power up

• system configuration: lock-app/nrfconnect for nRF52840-DK board

• screenshots, images, logs, etc.

nRF5280-DK board fails to boot normally and keeps reboot automatically with Error messages

Boot Log
Z+
W+▒ещ5
I: 8 Sectors of 4096 bytes
I: alloc wra: 0, ff0
I: data wra: 0, 0
*** Booting Zephyr OS version 2.4.99 ***
I: Init CHIP stack
I: SoftDevice Controller build revision:
I: e5 c7 9c d9 91 00 1d 66 |.......f
I: ea fb 6e 7b 98 2f 42 0d |..n{./B.
I: f1 60 93 c8 |.`..
I: Starting CHIP task
I: Init Thread stack
I: 496[DL] OpenThread started: OK
I: 499[DL] Setting OpenThread device type to MINIMAL END DEVICE
I: 505[ZCL] Using ZAP configuration...
I: 508[ZCL] deactivate report event
D: 511[IN] TransportMgr initialized
I: 515[IN] local node id is lu

D: 518[DL] SetAdvertisingEnabled(true)
E: ***** USAGE FAULT *****
E: Unaligned memory access
E: r0/a1: 0x2000583d r1/a2: 0x0006f8e6 r2/a3: 0x0000001a
E: r3/a4: 0x0006f901 r12/ip: 0xffffffff r14/lr: 0x00048e8f
E: xpsr: 0x21000000
E: Faulting instruction address (r15/pc): 0x0004ad56
E: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
E: Current thread: 0x20002eb0 (main)
E: Resetting systemI: nRF5 802154 radio initialized
I: 8 Sectors of 4096 bytes
I: alloc wra: 0, ff0
I: data wra: 0, 0

Kindly suggest what could be the issue and how to resolve it? Thank You very much

[Øyvind]

Hello, 

I will need some time to look into the CHIP documentation and test this my self, as I have never used it before.

The documentation of the CHIP lock-app states the following:
"The example requires the nRF Connect SDK v1.4.0. You can either install it along with the related tools directly on your system or use a Docker image that has the tools pre-installed."
"The application requires the nRF Connect SDK v1.4.0 to work correctly."

Have you installed NCS v1.4.0? Have you followed instructions given in "Using native shell for setup"?

Kind regards,
Øyvind

[Anupam Roy]

Hello,

I performed following steps before building lock-app sample.

1. nRF SDK Download & Installation

cd ~/

mkdir ncs

cd ncs

~/ncs$ west init -m github.com/.../sdk-nrf --mr master

~/ncs$ west update

~/ncs$ west zephyr-export

2. Zephyr SDK Download

cd ~/

$wget github.com/.../zephyr-sdk-0.12.2-x86_64-linux-setup.run

$chmod +x zephyr-sdk-0.12.2-x86_64-linux-setup.run

$./zephyr-sdk-0.12.2-x86_64-linux-setup.run -- -d ~/zephyr-sdk-0.12.2

3. Set Zephyr Environment

Run following command

$souce ~/ncs/zephyr/zephyr-env.sh <= This will set ZEPHYR_BASE environment variable

4. Build lock-app sample application

cd /<connectedhomeip>/examples/lock-app/nrfconnect

<connectedhomeip>/examples/lock-app/nrfconnect \$west build -b nrf52840dk_nrf52840

After step#4, zephyr.hex file is successfully generated. Following is the final Build Log.

Build Log

=====================================

[535/575] Performing configure step for 'chip-gn'
Done. Made 49 targets from 63 files in 470ms
[536/575] Performing build step for 'chip-gn'
[228/228] stamp obj/ABS_PATH/home/chip/...config/nrfconnect/chip-gn/default.stamp
[570/575] Linking CXX executable zephyr/zephyr_prebuilt.elf
Memory region Used Size Region Size %age Used
FLASH: 471532 B 1 MB 44.97%
SRAM: 154537 B 256 KB 58.95%
IDT_LIST: 200 B 2 KB 9.77%
[575/575] Linking CXX executable zephyr/zephyr.elf

=======================================

Please let me know if anything is missed. Thank You

BR,

-Anupam Roy

[Øyvind]

Hi, 

Have you tried to build the samples under nrf\samples\connectedhomeip? I'm currently having some issues with my NCS install, but working on a fix.

Kind regards,
Øyvind

[Anupam Roy]

Hello,

 I did not try to build these samples. I will give it a try.

BR,

-Anupam Roy

[Anupam Roy]

Hello,

  I did not try to build these samples. Can i build  lock app  for nrf52840dongle_nrf52840 hardware?

BR,

[Øyvind]

Yes, please give them a try. Unfortunately, these are the only officially supported boards as far as I can see: 

nrf52840dk_nrf52840, nrf5340dk_nrf5340_cpuapp

That does not mean that it will not work with the dongle, make sure to add nrf52840dongle_nrf52840.overlay similar to the one found here:

modules\lib\connectedhomeip\examples\lock-app\nrfconnect\boards\nrf52840dk_nrf52840.overlay

Let me know how it works for you.