RE: [Xen-devel] Xen doesnt recognize my root fs, while native kernel can ???

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jun Koi
> Sent: 13 June 2007 09:54
> To: Keir Fraser
> Cc: xen-devel
> Subject: Re: [Xen-devel] Xen doesnt recognize my root fs, 
> while native kernel can ???
> 
> On 6/13/07, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
> > On 13/6/07 08:49, "Jun Koi" <junkoi2004@xxxxxxxxx> wrote:
> >
> > >>> The point is that Xen doesnt boot in the first place, 
> so I cannot
> > >>> provide xm dmesg!
> > >>>
> > >>> Below is the output from dmesg (native kernel) and 
> Dom0's .config.
> > >>> Anything else do you need?
> > >>
> > >> Can you get a serial line on the machine?
> > >
> > > Opps, that is compicated, as I dont have a cable to do that.
> > >
> > > So if you have no suggestion, perhaps I must try this 
> way. But perhaps
> > > it take more than a week, as I am away in few days.
> >
> > There's a decent chance that comparing the two dmesg 
> outputs will show some
> > important deviation in the case of running on Xen that is 
> causing the boot
> > failure. Without the failing output it's hard to know where to start
> > looking.
> >
> 
> I see, but can you imagine some reasons why that happens?  It makes
> absolute no sense to me.

There are lots of possible reasons. The most likely is that your kernel
in the native has drivers that are not part of the Xen default
configuration. 

The other very common problem is that you don't have those necessary
drivers in the "initrd" for your Xen. This is a problem that is posted
about three times a week (at least) on the Xen Users mailing list [where
this problem probably should be discussed - but I think since it's
started here, we'll keep it here]. 

> 
> I have found that my machine has no serial port, so perhaps I must buy
> a serial card to debug this problem. Wonder if there is another way to
> avoid that (?)
If you have a digital camera and you add "noreboot" to the commandline
of "xen.gz" in your grub configuration, maybe you can upload (to some
photo-web-site or such) a screen-shot of the final few lines of the boot
and send a link to the list - that may not give all clues, but at least
it will indicate what's going on. 

--
Mats
> 
> Thanks,
> Jun
> 
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> 
> 



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