BLE FOTA success, but fails final stage

[jju]

I have finally got FOTA working with external flash, but I have a strange problem.

When the FOTA is complete, the mcuboot fails, but the new image boots correctly.

So it seems to work, but I would like to know the root cause for this problem.

Below is a dump from my terminal.

[00:00:01.307,373] <inf> mcuboot: Image 0 copying the secondary slot to the primary slot: 0x3133c bytes
[00:00:05.330,017] <dbg> mcuboot: boot_write_magic: writing magic; fa_id=3 off=0x6dff0 (0x7dff0)
[00:00:05.330,322] <dbg> mcuboot: boot_copy_image: erasing secondary header
[00:00:05.373,046] <dbg> mcuboot: boot_copy_image: erasing secondary trailer
[00:00:05.376,342] <err> os: ***** BUS FAULT *****
[00:00:05.376,373] <err> os: Precise data bus error
[00:00:05.376,373] <err> os: BFAR Address: 0xfffffffa
[00:00:05.376,373] <err> os: r0/a1: 0xffffffea r1/a2: 0x0006d000 r2/a3: 0x00001000
[00:00:05.376,403] <err> os: r3/a4: 0x0000bc30 r12/ip: 0x00000000 r14/lr: 0x00000ca5
[00:00:05.376,403] <err> os: xpsr: 0xa1000000
[00:00:05.376,403] <err> os: Faulting instruction address (r15/pc): 0x00009940
[00:00:05.376,434] <err> os: >>> ZEPHYR FATAL ERROR 25: Unknown error on CPU 0
[00:00:05.376,464] <err> os: Current thread: 0x20000758 (unknown)
�boot_go6.004,730] <err> fatal_error: Resetting system

New firmware loads correctly here...

The faulting instruction address: 0x00009940 is:

C:/ncs/v2.6.1/zephyr/drivers/clock_control/clock_control_nrf.c:124

Which is the line: return GET_STATUS(get_sub_data(dev, type)->flags);

[Sigurd Hellesvik]

Hi,

This is for a custom board right?

Do you, by chance, have a nRF52840DK or similar DK with external flash? If so, it would be interesting to see if you get similar issues with the DK and the same code?

Regards,
Sigurd Hellesvik

[jju]

Hi, 

Thank you for your reply. :-)

Yes, it is a custom board.

No, I do not have a nRF52840DK, only board I have is a nRF52 DK (52832) ,but this is without external flash.

But I don't understand, how the board could cause this behavior. ?

[Sigurd Hellesvik]

jju said:

But I don't understand, how the board could cause this behavior. ?

Nothing specific, but it is always nice to reduce the problem. (Less variables).

But let's see what we can do with a custom board.

I have finally got FOTA working with external flash

As part of a larger project, or just a sample doing only this?

[jju]

It's a part of a larger project, but for start, I also get the error, when I just modified the peripheral_lbs sample to support external flash.

[Sigurd Hellesvik]

Interesting. Can you explains what changes you did to peripheral_lbs?