By passing the kernel panic parameter, the system automatically resets after 3 seconds when kernel panic happen

example:

　　bootargs  'board=xxxxx console=ttyS0,115200 ubi.mtd=overlay rootfs=/dev/mtdblock:rootfs  rootfstype=squashfs noinitrd init=/sbin/init  panic=3'

[    4.850000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

[    4.850000] Rebooting in 3 seconds..

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