WatchDog timer crash - System reboots to old image / recovery image

mangOH Red
#1

Hi,

On our custom WP76xx board, the current or default image is as below.
We have added 2 legato applications for wifi working. Added this app using command line update.

We observed that on 4 out of 10 boards watch dog timer crash happens and it reboots. But when it reboots, on the board the user legato applications which were installed, is now uninstalled on the board.

Can you help resolve this issue ?

root@swi-mdm9x28-wp:~# cm info
Device: WP7607
IMEI: 359779080351469
IMEISV: 5
FSN: [ 33.717828] i2c-msm-v2 78b8000.i2c: NACK: slave not responding, ensure its powered: msgs(n:1 cur:0 tx) bc(rx:0
V3021586291610
Firmware Version: SWI9X07Y_02.18.05.00 000000 jenkins 2018/07/19 17:40:21
Bootloader Version: SWI9X07Y_02.18.05.00 000000 jenkins 2018/07/19 17:40:21
MCU Version: 002.009
PRI Part Number (PN): 9908663
PRI Revision: 001.002
Carrier PRI Name: GENERIC
Carrier PRI Revision: 002.041_002
SKU: 1104192
Last Reset Cause: Crash
Resets Count: Expected: 30 Unexpected: 6
root@swi-mdm9x28-wp:~# [ 37.210163] usb 1-1: device descriptor read/64, error -110

#2

does your application cause the watchdog timer crash?

Please also see here:
https://docs.legato.io/latest/toolsTarget_update.html

“Updated or modified systems enter a probationary period (default 30 minutes) during which time an app or framework daemon failure will result in a roll-back to the previous “good” system. For development and testing, you can mark a system good (pass), bad (fail) or defer.”

#3

the legato apps does not cause any crash, it just waits for at commands on a socket.

If the udpate -g is entered, this will include the apps which are updated later ? like the user legato apps when the watchdog crash happens and recovers , the installed app will be up after reboot ?

#4

I think so, but in case it still disappear, you need to build your application to legato.cwe, just like the user legato apps