Full modem firmware update "nrf_modem_full_dfu_digest" function not working

[berendvisser]

Hello,

I have implemented a full dfu based on the http flash sample and the full modem dfu api.

After writing the update to flash, i want to verify the written areas and compare the hashes to the hashes in "firmware.update.image.digest.txt".

This can be achieved by using

nrf_modem_full_dfu_digest(uint32_t addr, uint32_t size, struct nrf_modem_full_dfu_digest *digest_buffer);

,

However, this function returns an error, even after first uploading the bootloader.

Also, the modem starts correctly after rebooting, meaning the firmware was updated correctly.

I still want to be able to verify this though, how can i do this?

[Charlie]

Hi Berendvisser,

fmfu_fdev_load actually does the comparison of digests for the whole nRF cloud downloaded firmware sha256 hash and  firmware.update.image.digest.txt.

Can you adapt it for the general HTTP full modem firmware update(fmfu) digests comparison in your application?

Best regards,

Charlie

[berendvisser]

Hey Charlie,

In my implementation, instead of reading chunks from flash I get packets over uart.

I can still calculate the hash while uploading and compare it afterward to see if it matches the one from the header.

However, this way I can not verify if it was flashed correctly.

Later, I will try to run this example and find out how exactly it works.

Charlie said:

Mcumgr based full modem update AP

Kind regards,

Berend