Serial LTE Modem Application (NRF9160) FOTA does not apply new update

[ronald-blackline]

Hi,

I have the SLM application running in a custom board with uses the NRF9160. The SLM is driven an external microprocessor within the same board. Everything seems to work but FOTA will not apply the update.

Basically, we send the following commands after we confirmed successful network registration:

AT#XFOTA=8
AT#XFOTA=1,"">xxxxxx.amazonaws.com/app_update.bin"

This sequence of commands downloaded the FOTA image successfully. Then, we apply the AT#RESET command and this is what we are seeing from RTT

00> *** Booting Zephyr OS build v2.7.0-ncs1 ***
00> I: Starting bootloader
00> I: Primary image: magic=good, swap_type=0x4, copy_done=0x1, image_ok=0x1
00> I: Secondary image: magic=good, swap_type=0x2, copy_done=0x3, image_ok=0x3
00> I: Boot source: none
00> I: Swap type: test
00> D: erasing trailer; fa_id=3
00> D: initializing status; fa_id=3
00> D: writing swap_info; fa_id=3 off=0x6ffd8 (0x7ffd8), swap_type=0x2 image_num=0x0
00> D: writing swap_size; fa_id=3 off=0x6ffd0 (0x7ffd0)
00> D: writing magic; fa_id=3 off=0x6fff0 (0x7fff0)
00> D: erasing trailer; fa_id=7
00> D: writing copy_done; fa_id=3 off=0x6ffe0 (0x7ffe0)
00> I: Bootloader chainload address offset: 0x10000
00> I: Jumping to the first image slot
00> *** Booting Zephyr OS build v2.7.0-ncs1 ***
00> I: Starting bootloader
00> I: Primary image: magic=good, swap_type=0x2, copy_done=0x1, image_ok=0x3
00> I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
00> I: Boot source: none
00> I: Swap type: revert
00> I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
00> D: erasing trailer; fa_id=7
00> D: writing image_ok; fa_id=7 off=0x6ffe8 (0xeffe8)
00> D: writing swap_size; fa_id=7 off=0x6ffd0 (0xeffd0)
00> D: writing magic; fa_id=7 off=0x6fff0 (0xefff0)
00> D: erasing trailer; fa_id=3
00> D: initializing status; fa_id=3
00> D: writing swap_info; fa_id=3 off=0x6ffd8 (0x7ffd8), swap_type=0x4 image_num=0x0
00> D: writing image_ok; fa_id=3 off=0x6ffe8 (0x7ffe8)
00> D: writing swap_size; fa_id=3 off=0x6ffd0 (0x7ffd0)
00> D: writing magic; fa_id=3 off=0x6fff0 (0x7fff0)
00> D: erasing trailer; fa_id=7
00> D: writing copy_done; fa_id=3 off=0x6ffe0 (0x7ffe0)
00> I: Bootloader chainload address offset: 0x10000
00> I: Jumping to the first image slot

After this, the SLM gets run again and we read the following response from the application:

b'\x00Ready\r\n'
b'\r\n'
b'#XFOTA: 5,1,-9\r\n'

This basically indicates failure in the FOTA process. Can someone please help.

[Håkon Alseth]

Hi,

ronald-blackline said:

I was able to make it work but I have to remove one of the required configuration I have to use in my project. I have this config defined:

CONFIG_SLM_START_SLEEP=y

Whenever I removed this configuration in the project, the actual image swap is successful. If I put it back in, the swap reverts back (thus failing). I investigated and whenever the following APIs are called (in main.c) ...

nrf_power_resetreas_get(NRF_POWER_NS);
nrf_power_resetreas_clear(NRF_POWER_NS, 0x70017);

... the swap fails.

As a workaround I moved the following calls before the *nrf_power_resetreas_* APIs:

handle_nrf_modem_lib_init_ret();
handle_mcuboot_swap_ret();

I just wanted to notify you that we have a proposed fix merged to main branch now:

https://github.com/nrfconnect/sdk-nrf/pull/7040

 

Kind regards,

Håkon