Difference between revisions of "RPI safe mode"
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| − | + | This results in config.txt being ignored (except for avoid_safe_mode). A default cmdline.txt is applied, and kernel_emergency.img is loaded (if not available, then just kernel.img). | |
| + | It provides a means of recovering from, e.g. | ||
| + | * too high an overclock | ||
| + | * a typo in cmdline.txt | ||
| + | * an incorrect kernel=<filename> parameter | ||
| + | * an invalid display mode | ||
| + | without requiring a PC. | ||
| + | (Obviously it won't help if you've deleted start.elf...) | ||
| + | |||
| + | The busybox based kernel_emergency.img has /boot mounted, and vi installed so you can fix up config.txt or cmdline.txt. | ||
| + | (You can also mount /dev/mmcblk0p2 and fix up the rootfs if you have problems there that stop you booting). | ||
| + | |||
| + | Short Jumpers 5&6. | ||
| + | Be very careful with where you insert the jumper. Some pins carry power, so shorting those would not be a good idea. Third row from the end. | ||
| + | |||
| + | |||
| + | More info: | ||
http://www.raspberrypi.org/phpBB3/viewtopic.php?f=29&t=12007 | http://www.raspberrypi.org/phpBB3/viewtopic.php?f=29&t=12007 | ||
Revision as of 19:44, 30 August 2012
This results in config.txt being ignored (except for avoid_safe_mode). A default cmdline.txt is applied, and kernel_emergency.img is loaded (if not available, then just kernel.img).
It provides a means of recovering from, e.g.
- too high an overclock
- a typo in cmdline.txt
- an incorrect kernel=<filename> parameter
- an invalid display mode
without requiring a PC. (Obviously it won't help if you've deleted start.elf...)
The busybox based kernel_emergency.img has /boot mounted, and vi installed so you can fix up config.txt or cmdline.txt. (You can also mount /dev/mmcblk0p2 and fix up the rootfs if you have problems there that stop you booting).
Short Jumpers 5&6. Be very careful with where you insert the jumper. Some pins carry power, so shorting those would not be a good idea. Third row from the end.
More info:
http://www.raspberrypi.org/phpBB3/viewtopic.php?f=29&t=12007
