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grub2: fix a few minor issues in help text

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The help text of grub2 explains the detailed steps to create a disk
image with grub2 installed on it. However, the steps for the
BIOS-based systems have a few minor issues fixed by this patch:

 - When calling partx to get the partitions detected, we should do it
   on the /dev/loop0 block device, and not on the underlying disk.img
   image file.
 - The grub-bios-setup utility must be called as root to work properly
   on /dev/loop0.
 - The steps to cleanup the partx and loop device were missing.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Thomas Petazzoni 2014-07-01 19:39:16 +02:00
parent a1a16ebb02
commit a3ac2a6f58
1 changed files with 6 additions and 3 deletions
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9
boot/grub2/Config.in
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@ -24,17 +24,20 @@ config BR2_TARGET_GRUB2
store Grub2. Leaving 1 MB of free space is safe. store Grub2. Leaving 1 MB of free space is safe.
3. Setup loop device and loop partitions 3. Setup loop device and loop partitions
sudo losetup -f disk.img sudo losetup -f disk.img
sudo partx -a disk.img sudo partx -a /dev/loop0
4. Prepare the root partition 4. Prepare the root partition
sudo mkfs.ext3 -L root /dev/loop0p1 sudo mkfs.ext3 -L root /dev/loop0p1
sudo mount /dev/loop0p1 /mnt sudo mount /dev/loop0p1 /mnt
sudo tar -C /mnt -xf output/images/rootfs.tar sudo tar -C /mnt -xf output/images/rootfs.tar
sudo umount /mnt sudo umount /mnt
5. Install Grub2 5. Install Grub2
./output/host/usr/sbin/grub-bios-setup \ sudo ./output/host/usr/sbin/grub-bios-setup \
-b ./output/host/usr/lib/grub/i386-pc/boot.img \ -b ./output/host/usr/lib/grub/i386-pc/boot.img \
-c ./output/images/grub.img -d . /dev/loop0 -c ./output/images/grub.img -d . /dev/loop0
6. Your disk.img is ready! 6. Cleanup loop device
sudo partx -d /dev/loop0
sudo losetup -d /dev/loop0
7. Your disk.img is ready!
To test your BIOS image in Qemu: To test your BIOS image in Qemu: