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Re: [Qemu-devel] diskimage HOWTO

From: Bai Shuwei
Subject: Re: [Qemu-devel] diskimage HOWTO
Date: Mon, 24 Aug 2009 16:30:54 +0800

On 8/24/09, Kevin Wolf <address@hidden> 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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