imx reboot failed

ilyyxfe — Mon, 08 Apr 2019 08:56:16 GMT

i use the imx6sllevk。

when i log in, and try to reboot. but sometimes it can not reboot successfully.

pls check the follow log.

root@imx6sllevk:~# reboot
[ OK ] Stopped target Multi-User System.
Stopping Login Service...
[ OK ] Stopped target Remote File Systems.
Stopping Kernel Logging Service...
Stopping System Logging Service...
Stopping D-Bus System Message Bus...
[ OK ] S 霳topping Serial Getty on ttymxc0...
[ OK ] Stopped target System Time Synchronized.
[ OK ] Stopped target Containers.
[ OK ] Stopped target Timers.
[ OK ] Stopped target Sound Card.
Stopping Save/Restore Sound Card State...
[ OK ] Stopped Daily Cleanup of Temporary Directories.
Stopping Getty on tty1...
[ OK ] Stopped target Host and Network Name Lookups.
Stopping Network Name Resolution...
[ OK ] Stopped System Logging Service.
[ OK ] Stopped Serial Getty on ttymxc0.
[ OK ] Stopped Getty on tty1.
[ OK ] Stopped D-Bus System Message Bus.
[ OK ] Stopped Kernel Logging Service.
[ OK ] Stopped Login Service.
[ OK ] Stopped Network Name Resolution.
[ OK ] Stopped Save/Restore Sound Card State.
[ OK ] Stopped target Network.
Stopping Network Service...
[ OK ] Removed slice system-getty.slice.
[ OK ] Removed slice system-serial\x2dgetty.slice.
[ OK ] Stopped target Basic System.
[ OK ] Stopped target Paths.
[ OK ] Stopped Dispatch Password Requests to Console Directory Watch.
[ OK ] Stopped Forward Password Requests to Wall Directory Watch.
[ OK ] Stopped target Sockets.
[ OK ] Closed D-Bus System Message Bus Socket.
[ OK ] Stopped target System Initialization.
Stopping Network Time Synchronization...
Stopping Load/Save Screen Backlight…ightness of backlight:backlight...
Stopping Load/Save Random Seed...
[ OK ] Stopped Update is Completed.
[ OK ] Stopped Rebuild Dynamic Linker Cache.
[ OK ] Stopped Rebuild Hardware Database.
[ OK ] Stopped Rebuild Journal Catalog.
[ OK ] Stopped target Slices.
[ OK ] Removed slice User and Session Slice.
[ OK ] Closed Syslog Socket.
[ OK ] Stopped Network Time Synchronization.
[ OK ] Stopped Network Service.
[ OK ] Stopped Load/Save Screen Backlight Brightness of backlight:backlight.
[ OK ] Stopped Load/Save Random Seed.
[ OK ] Removed slice system-systemd\x2dbacklight.slice.
[ OK ] Stopped Apply Kernel Variables.
[ OK ] Stopped Create Volatile Files and Directories.
[ OK ] Stopped target Local File Systems.
Unmounting /var/volatile...
Unmounting Temporary Directory (/tmp)...
Unmounting /boot...
Unmounting /usr/bin/ttm_ttts/a...
[FAILED] Failed unmounting /var/volatile.
[FAILED] Failed unmounting Temporary Directory (/tmp).
[FAILED] Failed unmounting /boot.
[FAILED] Failed unmounting /usr/bin/ttm_ttts/a.
[ OK ] Stopped target Swap.
[ OK ] Reached target Unmount All Filesystems.
[ OK ] Stopped target Local File Systems (Pre).
[ OK ] Stopped Create Static Device Nodes in /dev.
[ OK ] Stopped Create System Users.
[ OK ] Stopped Remount Root and Kernel File Systems.
[ OK ] Reached target Shutdown.
systemd: 23 output lines suppressed due to ratelimiting
systemd-journald[148]: Failed to send WATCHDOG=1 notification message: Connection refused
random: crng init done
systemd-journald[148]: Failed to send WATCHDOG=1 notification message: Transport endpoint is not connected
systemd-journald[148]: Failed to send WATCHDOG=1 notification message: Transport endpoint is not connected
systemd-journald[148]: Failed to send WATCHDOG=1 notification message: Transport endpoint is not connected
systemd-journald[148]: Failed to send WATCHDOG=1 notification message: Transport endpoint is not connected
systemd-journald[148]: Failed to send WATCHDOG=1 notification message: Transport endpoint is not connected

it will print the last sentense repeatly.

the two modification i think may cause this

i enable the wdt and set the timeoutsec 128(default 60) during the probe.

i make the system read-only by modifying the local.conf before build the .sdcard

pls give some advice why this happen and how to solute it.

best regards

zhang

Re: imx reboot failed

igorpadykov — Mon, 08 Apr 2019 10:21:32 GMT

Hi xhang

reset is performed by WDOG_B signal on p.14 i.MX6SLL EVK schematic, by writing to

WDOGx_WCR register

MCIMX6SLL-EVK board Design files, including hardware schematics, Gerbers, and OrCAD files^{(REV 0)}

Probably you icorrectly changed wdt settings and you can try to debug it with oscilloscope using

Chapter 49 Watchdog Timer (WDOG) i.MX 6SLL Applications Processor Reference Manual ^{(REV 0)}

and sect.2.11 Watchdog (WDOG) attached Linux Manual.

Best regards
igor
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