[Xen-users] VFS: Unable to mount root fs on unknown-block(0,0)

[Bo <barnesno@xxxxxxxxx>]

I have compiled a kernel from the sources in xen-3.0.3_0-src.tgz.  I
generated an initrd via mkinitrd /boot/initrd-2.6.16.29-xen.img
2.6.16.29-xen (after doing a depmod) 

I did a make world/make install from the source directory, per
instructions in the README.  I extracted the files from the initrd file
to see what the init script looked like.  It has a line inserting the
ext3.ko module.

The last few lines from the output:

(XEN) Xen trace buffers: disabled
(XEN) Xen is relinquishing VGA console.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
input to Xen).
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(0,0)
 (XEN) Domain 0 crashed: 'noreboot' set - not rebooting.

The menu.lst (trimmed)

serial --unit=0 --speed=19200 --word=8 --parity=no --stop=1
terminal --timeout=10 serial console
title Fedora Core (2.6.16-29_FC4xen0)
        root (hd1,1)
        kernel /boot/xen.gz dom0_mem=262144 noreboot com1=19200n81
        module /boot/vmlinuz-2.6.16-xen ro root=/dev/hdb2 quiet
console=tty0 console=ttyS0,19200n8
        module /boot/initrd-2.6.16.29-xen.img

This seems to conform to everything I've ever been able to google on
making Domain 0 boot. Here is the section that boots normally.
title Fedora Core (2.6.11-1.1369_FC4)
        root (hd1,1)
        kernel /boot/vmlinuz-2.6.11-1.1369_FC4 ro root=LABEL=/12 rhgb quiet
        initrd /boot/initrd-2.6.11-1.1369_FC4.img

Note that I had to replace the root=LABEL=/12 with root=/dev/hdb2
because it complained about not finding that label.

There are no errors during compilation and no errors in the boot
messages prior to the failure.

The first few lines of the boot messages:

  Booting 'Fedora Core (2.6.16-29_FC4xen0)'

root (hd1,1)
 Filesystem type is ext2fs, partition type 0x83
kernel /boot/xen.gz dom0_mem=262144 noreboot com1=19200n81
   [Multiboot-elf, <0x100000:0x815d8:0x48a28>, shtab=0x1ca078,
entry=0x100000]
module /boot/vmlinuz-2.6.16-xen ro root=/dev/hdb2 quiet console=tty0
console=tt
yS0,19200n8
   [Multiboot-module @ 0x1cb000, 0x2d703c bytes]
module /boot/initrd.img
   [Multiboot-module @ 0x4a3000, 0x282200 bytes]

Any suggestions as what to try next would be appreciated.  I've googled
and read all I could find on FC and xen to no avail.

Thanks,
Bo



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