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[Qemu-devel] diskimage HOWTO

From: Bai Shuwei
Subject: [Qemu-devel] diskimage HOWTO
Date: Mon, 24 Aug 2009 13:39:53 +0800

Hi, All:
  I want to build a test enviroment with QEMU and buildroot. But I don't know how to build the diskimage which same as linux-0.2.img offered by BUILD-ROOT. I build the diskimage following the 
   buildroot-2009.05/docs/README.diskimage, but failure.
   The bellow is my process.
   # dd if=/dev/zero of=img bs=4096 count=16384
   # echo -e "n\np\n1\n\nw\n" | fdisk -C 16065 -H 255 -S 63 ./img
   # losetup -o 512 /dev/loop0 img
   # mkfs.ext2 -m0 -Lslash /dev/loop0
   # mount -oloop,rw /dev/loop0 fs/
   # cp -a ../root/* fs/
..root is the filesystem built by BUILD-ROOT and the bzImage has been copied into root/boot/, grub.lst has been created too.
  # umount fs/
  # losetup -d /dev/loop0
  # losetup /dev/loop0 img
  # grub --device-map=/dev/null
grub> device (hd0) img
device (hd0) img
grub> geometry (hd0) 16065 255 63
geometry (hd0) 16065 255 63
drive 0x80: C/H/S = 16065/255/63, The number of sectors = 258084225, img
   Partition num: 0,  Filesystem type unknown, partition type 0x83
grub> root (hd0,0)
root (hd0,0)
 Filesystem type unknown, partition type 0x83
grub> setup (hd0)
setup (hd0)

Error 17: Cannot mount selected partition

I don't know why it is error. Gald if you can help or give me some document on it.
Best Regards!
Bai SHuwei

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