Editing Troubleshooting boot issues

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When trying to debug boot problems, the following (or something simillar) may help you.
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You'll need bootmenu [http://fanoush.wz.cz/maemo/#initfs] with a telnet or ssh server installed. I'll suppose that a telnet server is used:
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You'll need the initfs_flash with a telnet or ssh server installed. I'll suppose that a telnet server is used:
* Boot Nxx0 and start the telnet/ssh server
* Boot Nxx0 and start the telnet/ssh server
* Connect USB cable to PC
* Connect USB cable to PC
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* In your Linux PC run:
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* Run:
  modprobe usbnet
  modprobe usbnet
  ifconfig usb0 up
  ifconfig usb0 up
  ip addr add dev usb0 192.168.10.2/24
  ip addr add dev usb0 192.168.10.2/24
  telnet 192.168.10.1
  telnet 192.168.10.1
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(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)
 
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* You're now connected. Load required modules for accessing your root partition (not all of them are required):
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* You're now connected. Load required modules for accessing your root partition:
  insmod /lib/modules/2.6.21-omap1/jbd.ko  
  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/mbcache.ko  
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  insmod /lib/modules/2.6.21-omap1/ext3.ko
  insmod /lib/modules/2.6.21-omap1/ext3.ko
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* And mount the root partition (suppose it is /dev/mmcblk0p2):
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* And mount the root partition:
  mount /dev/mmcblk0p2 /mnt/new_root -t ext3 -o noatime
  mount /dev/mmcblk0p2 /mnt/new_root -t ext3 -o noatime
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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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== Reporting reboot issues ==
 
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When reporting strange booting/rebooting issues here is a list of information that is helpful in debugging:
 
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* Output of <code>/proc/bootreason</code>
 
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* Output of <code>/var/lib/dsme/stats/lifeguard_resets</code>
 
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* Application running when the reboot occurred
 
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* State of device - idle with cover, idle without cover, turned off, in use, etc.
 
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* Mode of device - R&D or production mode
 
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* <code>dmesg</code> after a successful boot. This will show whether the OOM (out of memory) killer is reaping processes.
 
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<code>/proc/bootreason</code> can have the following values:
 
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pwr_key Power key was pressed to switch on device
 
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32wd_to Watchdog reset - something was consuming too much CPU causing a watchdog reset, or kernel crashed
 
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sw_rst Software reset (critical system application crashing or being killed by the kernel OOM-killer)
 
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rtc_alarm An alarm woke up the device
 
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You need to install XTerm or [[SSH]] to get a console. Then use <code>cat</code> to get the contents of a particular file.
 
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You can create a <code>core-dumps</code> directory on the internal flash card, then crashing applications will leave core files in it. Use <code>file core.*</code> to find out the name of the crashed application. In theory, you can use <code>gdb</code> to get the stack trace, but without debug symbols it wont be any use. If you copy <code>*.core</code> files to your Linux PC you can use <code>gdb</code> see what program crashed, use <code>gdp -core core.xxxx</code> where <code>xxxx</code> is the number of the file.
 
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And finally, file [http://bugs.maemo.org bugs] against the problem applications!
 
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[[Category:N8x0]]
 
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[[Category:Power users]]
 

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