NRF91DK Board nRF52840 Unable to load/boot Zephyr RTOS

[OryF]

Hello, thanks for reviewing this.

I am trying to install and run Zephyr on the nRF52840 module that is on-board the nRF91 DK board. I have gone through the setup process and get a bus fault error when I flash it, and I have tried several samples.

For this topic lets go with me trying to get the bluetooth broadcast example
I ran `cmake -GNinja -DBOARD=nrf52_pca10090 ..` from a clean `build` directory, then ran `ninja`, finally running `ninja flash`. This results in a successful flash but the serial output is always:

```
***** BUS FAULT *****
  Instruction bus error
***** Hardware exception *****
Current thread ID = 0x2000007c
Faulting instruction address = 0xf806f0
Fatal fault in essential thread! Spinning...
```
Due to the DK board being relatively new, I haven't found anything on this issue. I can successfully run Zephyr samples on other various nRF52 DK boards, but not this one.
I checked my dependencies, that I have everything needed from zephyr for this, cross compiler, switch set to nRF52, etc

Where do I begin to discover the cause of this? Is it already known?

Thanks again

[Sigurd]

Hi,

What sample did you test?

OryF said:

-DBOARD=nrf52_pca10090

I guess that you meant nrf52840_pca10090.

Did set the switch SW5 to nRF52 ?

[OryF]

The beacon sample as well as the hello world sample. And yes the nRF52 switch is selected

Update: I saw on https://docs.zephyrproject.org/latest/samples/hello_world/README.html that a single thread option existed, so I found a prj_single.conf in a different zephyr project, and brought it into my hello_world directory. I edited it so that it only disabled multithreading. I installed this on the nRF52840 and it threw the same error with different values

.***** BUS FAULT *****
  Instruction bus error
***** Hardware exception *****
Current thread ID = 0x00000000
Faulting instruction address = 0x1dc0

[OryF]

bump?

Any other suggestions?

[Sigurd]

Hi,

When you build for board=nrf52840_pca10090, it will load this board control fw.

That means that the prj.conf for the project, need to include this line: CONFIG_GPIO=y

[OryF]

Thank you Sigurd! I appreciate this advice. May I ask where I missed this in the documentation? And where I can find info on modifying the required files in general? Thanks, have a great day