Hello.
I was trying to bring up GRUB fallback feature on x86_64 based OpenWRT
build.
I used this article as a reference.
http://www.linuxscrew.com/2012/04/24/grub-fallback-boot-good-kernel-if-new-one-crashes/
It's for Fedora, but I hope, that I can do something similar for openwrt.
Here's my config:
serial --unit=0 --speed=38400 --word=8 --parity=no --stop=1
terminal_input console serial; terminal_output console serial
set default="saved"
set timeout="5"
set root='(hd0,msdos1)'
set fallback="0 1"
menuentry "OpenWrt" {
linux /boot/vmlinuz root=/dev/sda2 rootfstype=ext4 rootwait
console=tty0 console=ttyS0,38400n8 noinitrd
savedefault fallback
}
menuentry "OpenWrt-backup" {
linux /boot/vmlinuz-backup root=/dev/sda3 rootfstype=ext4 rootwait
console=tty0 console=ttyS0,38400n8 noinitrd
savedefault fallback
}
menuentry "OpenWrt (failsafe)" {
linux /boot/vmlinuz failsafe=true root=/dev/sda2 rootfstype=ext4
rootwait console=tty0 console=ttyS0,38400n8 noinitrd
}
But, when I try to boot openwrt with this config I get message, that
command is not recognized.
Booting `OpenWrt'
error: can't find command `savedefault'.
Press any key to continue...
I believe, that in order to make fallback feature work, I need loadenv
module enabled. I enabled it, but it didn't help.
I also found an information, that I might be getting troubles with
savedefault because my kernel and rootfs are stored on 4GB USB stick. Is
this a problem?
Can I reconfigure a grub somehow in order to have this feature?
Thanks,
Alex
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