[Xen-users] Problems with root=?? with hdb and Windows XP.

[Trevor Furnell <trevor.furnell@xxxxxxxxxxxxxxx>]

Hi;

        I'm having trouble getting dom1 to start.
        As expected I'm not doing things the easy way.
        I have a second hard drive in the machine that
        has WindowsXP installed on it. The drive was
        formated as fat32.

        The error I'm getting is.
------- start --------
VFS: Cannot open root device "hdb" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
 <c0418394> panic+0x3c/0x188  <c0651ac1> mount_block_root+0x1e0/0x1ee
 <c0651b18> mount_root+0x49/0x4e  <c0651bea> prepare_namespace+0xcd/0xfe
 <c0402242> init+0x206/0x2c6  <c0404a3a> ret_from_fork+0x6/0x14
 <c040203c> init+0x0/0x2c6  <c040203c> init+0x0/0x2c6
 <c0402989> kernel_thread_helper+0x5/0xb
---------- end --------

        My config file is.
--- start ------
name="Windows-XP"
kernel = "/boot/vmlinuz-2.6.17-1.2145_FC5xenU"
builder='linux'
memory = 1024
vcpus=1
pae=0
acpi=0
apic=0
cpus = ""
root = "/dev/hdb ro"
disk = [ 'phy:/dev/hdb,sda1,w' ]
on_poweroff = 'destroy'
on_reboot   = 'destroy'
on_crash    = 'destroy'
device_model = '/usr/lib/xen/bin/qemu-dm'
sdl=1
vnc=1
vncviewer=0
dhcp="dhcp"
---- end ----------

        not sure if this is relevant but
        an fdisk -l shows
-------- start ------------
Disk /dev/hda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1          13      104391   83  Linux
/dev/hda2              14       30401   244091610   8e  Linux LVM

Disk /dev/hdb: 203.9 GB, 203928109056 bytes
255 heads, 63 sectors/track, 24792 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
   Device Boot      Start         End      Blocks   Id  System
/dev/hdb1   *           1       24792   199141708+   c  W95 FAT32 (LBA)
-------- end ----------------------

        a pointer to a good web site explaining the
        root=?? line or just a straight out fix  :-)
        would be muchly appreciated.

--
Thanks.
Trevor Furnell

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