System Restore; Watchdog Function - Advantech RSB-4221 User Manual

4.14.4

System Restore

1. Click Settings / Backup & reset, then into main interface
2. Click System Restore:
3. Click restore and reboot, system will reboot for restore user data.
Note! Data is backed up to /data/data/ folder
4.15

Watchdog Function

The watchdog daemon auto startups when the android system boots. The default
timeout time is 60 seconds and the watchdog daemon refreshes every 2 seconds.
These two values can be modified.
1. Edit init.am335xevm.rc (you can find it under android_source _code/advantech/
rsb4221/):
# [Advantech]Set watchdog timer to 1 seconds and every 400 milliseconds to get
a 600 millisecond margin
service watchdogd /sbin/watchdogd 2000 58000
class core
Note! The "2000" means active time is every 2000 msecs!
The "5800" plus "2000" means the watchdog timeout is 60000 msecs!
These two values can be modified.
2. Rebuild the kernel image (refer to 4.4.2 Build android kernel) and create a
bootable SD card and test.
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