Arch Linux

liangxiao

Member

Registered: 2016-11-26

Posts: 2

[SOLVED]grub load failed in qemu

Installing grub to a image file, and run under qemu follow bellow steps. I got failed.

$ fdisk -l --bytes sys.img
Disklabel type: gpt
Disk identifier: 9CB15CF3-83C7-4D26-8EED-B3BFF89EFE9A

Device     Start   End Sectors     Size Type
sys.img1    2048  4095    2048  1048576 BIOS boot
sys.img2    4096 61406   57311 29343232 Linux filesystem

setup loop device

$ sudo losetup -f --offset 2097152 --sizelimit 29343232 sys.img
$ losetup
NAME       SIZELIMIT  OFFSET AUTOCLEAR RO BACK-FILE         DIO
/dev/loop0  29343232 2097152         0  0 /home/arm/sys.img   0

making a ext4 format

$ mkfs.ext4 /dev/loop0
Discarding device blocks: done                            
Creating filesystem with 28652 1k blocks and 7168 inodes
Filesystem UUID: e3e10180-9512-477b-9451-2dd0ead5af23
Superblock backups stored on blocks: 
	8193, 24577

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (1024 blocks): done
Writing superblocks and filesystem accounting information: done

mount to /mnt for grub-install

$ sudo mount /dev/loop0 /mnt

final step, install grub

$ sudo grub-install --target=i386-pc --boot-directory=/mnt/boot sys.img
Installing for i386-pc platform.
Installation finished. No error reported.

and I launched qemu with sys.img

qemu sys.img

I get grub load fail and enter rescue mode as bellow

error: no such device: e3e10180-9512-477b-9451-2dd0ead5af23
error: unknown filesystem.
Entering rescue mode...

It's prefect work when I do those procedure on physical driver. I found the report of qemu: no such device's UUID is same as the step mkfs.ext4's result.
And the deference between image file and physical driver are loop device setup.
Should I miss something on this step?
Thanks in advance.

Last edited by liangxiao (2016-11-27 00:35:23)

liangxiao

Member

Registered: 2016-11-26

Posts: 2

Re: [SOLVED]grub load failed in qemu

It works when I load archlinux iso in qemu, and run grub-install inside qemu guest system.