[Buildroot] [Qemu-devel] diskimage HOWTO
baishuwei at gmail.com
Mon Aug 24 08:30:54 UTC 2009
On 8/24/09, Kevin Wolf <kwolf at redhat.com> wrote:
> Bai Shuwei schrieb:
> > 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
> This looks like the wrong offset. The first partition usually starts at
> sector 63. But probably you'll want to use kpartx which takes an image
> and creates device nodes for each partition.
This the result
qemu/xtratum# fdisk -ul img
You must set cylinders.
You can do this from the extra functions menu.
Disk rootfs: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders, total 0 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x545a5c26
Device Boot Start End Blocks Id System
img1 63 258084224 129042081 83 Linux
Partition 1 has different physical/logical endings:
phys=(1023, 254, 63) logical=(16064, 254, 63)
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