Wi-Fi Scan Sample causing error (Boot_sig check failed for RPU(0))

[Michael Zeng]

Hi,

I am flashing a modified version of the wifi scan sample onto my nrf7002dk. Most of the time, the firmware will run and return the expected results. Sometimes, I will get this error:

[00:00:11.135,345] <err> wifi_nrf: wifi_nrf_hal_fw_chk_boot: Boot_sig check failed for RPU(0), Expected: 0x5A5A5A5A, Actual: 0xAAAAAAAA

[00:00:11.135,437] <err> wifi_nrf: wifi_nrf_fmac_fw_load: LMAC ROM boot check failed

[00:00:11.135,437] <err> wifi_nrf: wifi_nrf_fmac_dev_add_zep: wifi_nrf_fmac_fw_load failed

[00:00:11.135,467] <err> wifi_nrf: wifi_nrf_drv_main_zep: wifi_nrf_fmac_dev_add_zep failed

[00:00:11.135,772] <err> wifi_nrf: wifi_nrf_if_init_zep: Device wlan0 is not ready

[00:00:11.136,016] <err> wifi_nrf: wifi_nrf_if_start_zep: Device wlan0 is not ready

And the scanning fails. What is causing the error and how do I prevent this from happening?

Thanks,

Michael

[dejans]

Hi erichotterbeefcurry 

Could you please confirm that you see exactly the same error as Michael?

Could you please provide more information about your environment? 

You mentioned that you needed to move devices to another room for them to be able to work as expected. Could you provide more information on what has changed since then and now the error started to appear again?

What was running on your devices and where were they located (same room, different room, close to each other or not)?

When and how often did the error appear? Is the error intermittent or permanent?

Did rebooting the device help, as mentioned by Michael?

Best regards,
Dejan

[dejans]

Hi,

Which nrf7002-dk board revision do you use?

Best regards,
Dejan

[erichotterbeefcurry]

Hi Dejans, thanks for the detailed response!
To answer your questions. I have the same error message as Michael, but my Actual says 0x8888888.
We have 3 7002DKs that I tried flashing shell example to, all of them getting the same error.
When I first worked on the 7002DK, my desk had a router near it, and when it started getting the error, I showed it to my colleague in another room (that didn't have a router), and it worked after resetting, so we decided it may be interference from the router.
I can't recall how often the error appeared, but from yesterday, it was everytime I flashed wifi code to the DKs.
Rebooting the device did not help, I tried both --reset and --recover.
I did receive a reply from simonr that I should manually set the MAC address to the OTP memory.. I will give it a shot today. iirc my code used to have a section where it manually sets the MAC address, which I am not doing now. wifi_nrf library boot_sig check failed 

I will give you an update sometime today or tomorrow!
-Eric

[dejans]

Hi Eric,

Thank you for this information. Please let me know if you have any further questions.

Best regards,
Dejan