Troubleshooting boot issues
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Don't forget that the watchdog will reboot the machine after a some time. | Don't forget that the watchdog will reboot the machine after a some time. | ||
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Revision as of 05:12, 28 October 2008
When trying to debug boot problems, the following (or something simillar) may help you.
You'll need bootmenu [1] with a telnet or ssh server installed. I'll suppose that a telnet server is used:
- Boot Nxx0 and start the telnet/ssh server
- Connect USB cable to PC
- In your Linux PC run:
modprobe usbnet ifconfig usb0 up ip addr add dev usb0 192.168.10.2/24 telnet 192.168.10.1
(where 192.168.10.1 is the IP address of the Nxx0 device and 192.168.10.2 is an IP address in the same subnet to be used by your PC)
- You're now connected. Load required modules for accessing your root partition (not all of them are required):
insmod /lib/modules/2.6.21-omap1/jbd.ko insmod /lib/modules/2.6.21-omap1/mbcache.ko insmod /lib/modules/2.6.21-omap1/ext2.ko insmod /lib/modules/2.6.21-omap1/ext3.ko
- And mount the root partition (suppose it is /dev/mmcblk0p2):
mount /dev/mmcblk0p2 /mnt/new_root -t ext3 -o noatime
- Now run:
cd /mnt/new_root mount -obind /tmp /mnt/new_root/tmp pivot_root . mnt/initfs export OSSO_VERSION=$(cat /etc/osso_software_version)
- And you're ready to manually boot it:
cd /etc/init.d ./rcS ./rc 2
This will do the whole bootup procedure (not exactly, but the interresting part) and you'll be able to watch all bootup messages.
Don't forget that the watchdog will reboot the machine after a some time.