Hi Nathan , Bruce
thanks you all , grub seems to be working now . It is able to grub-install and
grub-mkconfig what I do is
1) having a file under /boot/grub/device.map as Bruce mentioned .
(hd0) /dev/sda
(hd1) /dev/sdb
sdb which has two partitions and I develop my LFS on it .
2) grub-install --grub-setup=/bin/true /dev/sdb
3) grub-mkconfig -o /boot/grub/grub.cfg
I check grub.cfg file as following
============== grub.cfg begin ========================
root:/boot/grub# cat grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by /usr/sbin/grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
set default=0
set timeout=5
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/10_linux ###
menuentry "GNU/Linux, Linux 2.6.30.5" {
insmod ext2
set root=(hd1,2)
search --no-floppy --fs-uuid --set e4adbac2-a338-4305-bafe-73f2adb307da
linux /boot/lfskernel-2.6.30.5 root=/dev/sdb2 ro
}
menuentry "GNU/Linux, Linux 2.6.30.5 (recovery mode)" {
insmod ext2
set root=(hd1,2)
search --no-floppy --fs-uuid --set e4adbac2-a338-4305-bafe-73f2adb307da
linux /boot/lfskernel-2.6.30.5 root=/dev/sdb2 ro single
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
=============== grub.cfg end =======================
refer "root=" in grub.cfg , I change my /etc/fstab as following
=============== /etc/fstab begin ===================
root:/boot/grub# cat /etc/fstab
# Begin /etc/fstab
# file system mount-point type options dump fsck
# order
/dev/sdb2 / ext3 defaults 1 1
#/dev/<yyy> swap swap pri=1 0 0
proc /proc proc defaults 0 0
sysfs /sys sysfs defaults 0 0
devpts /dev/pts devpts gid=4,mode=620 0 0
tmpfs /dev/shm tmpfs defaults 0 0
# End /etc/fstab
=============== /etc/fstab end ======================
but when I reboot , I got " kernel panic , not syncing:VFS:unable to mount root
fs on unknown-block(2,0)" , actually I try many different combinations just
wouldn't boot and got kernel panic every time .
@_@
BTW , I didn't change any things when I compile kernel .
--- 09/10/21 (三)，Bruce Dubbs <bruce.du...@gmail.com> ：
>
> > /boot/device.map should contains a listing of all
> drives, and the
> > partition they map to.
> >
> > ex:/ if you have 2 drives, and one floppy disk, it
> could contain.
> > (hd0) /dev/sda
> > (hd1) /dev/sdb
> > (fd0) /dev/floppy
> >
> >
> > I apologize, but I never did test to see if device.map
> is
> > automatically generated, or if I created it when I
> setup my grub2
> > system. Either way, echo "(hd0) /dev/sda" >
> /boot/device.map should
> > fix it
>
> I think that should be /boot/grub/device.map. At
> least that is how it is on my
> system.
>
> -- Bruce
>
> --
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