Re: dom0 won't boot -- Fixed

[Barry Rountree <rountree@cs.uga.edu>]

On Friday 30 July 2004 03:27 am, Ian Pratt wrote:
> > On Thursday 29 July 2004 08:29 pm, Ian Pratt wrote:
> > > All of that output is from grub, you're not seeing anything from
> > > Xen.
> > >
> > > Try "com1=115200,8n1" and make sure that you've got the baudrate
> > > at the other end set correctly (I thought grub defaulted to 9600?)
> >
> > It's set correctly -- 

[snip an embarrassing moment of hubris] 

> > title Xen-Serial
> > serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
> > terminal serial
> > kernel (hd0,4)/boot/xen.gz dom0_mem=131072 com1=115200 noht noreboot
> > module (hd0,4)/boot/vmlinuz-2.4.26-xen0 root=/dev/sda5 ro console=ttyS0
>
> You're setting the serial baud rate to 9600 in grub, then 115200
> in Xen? That doesn't sound sane. The baudrate mismatch is so
> gross that you probably wouldn't even see garbage.
>
DOH!  Yup, absolutely right.

> Try com1=9600,8n1   (I ca't remember whether the ',8n1' is
> mandatory but let's assume it is...)

The interesting bit:

FAT: bogus logical sector size 0
UMSDOS: msdos_read_super failed, mount aborted.
FAT: bogus logical sector size 0
FAT: bogus logical sector size 0
Kernel panic: VFS: Unable to mount root fs on 08:05
 <0>Rebooting in 1 seconds..(XEN) Domain 0 shutdown: rebooting machine!
(XEN) Reboot disabled on cmdline: require manual reset

The damning line from the kernel .config file:

# CONFIG_XFS_FS is not set

while /etc/fstab wants

/dev/sda5 / xfs defaults 1 1

Oooops....<blush>

Thanks to everybody who helped; I'll see if I can come up with a more 
interesting problem next time...

Barry

> Ian


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