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

["Jun Koi" <junkoi2004@xxxxxxxxx>]

Hi Mats,

On 6/13/07, Petersson, Mats <Mats.Petersson@xxxxxxx> wrote:
> > -----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].
No, that is not a reason in my case. I did it this way:
- Native kernel (2.6.18) is compiled with all the necessary drivers
built-in. That means I dont need initrd to boot my machine with this
kernel. And it boots well.
- I copied the .config of native kernel above to Dom0, and compile
Dom0 with this option. (Of course before compiling, I enabled Xen
option, as you can see in the .config of Dom0 I sent in the last
mail). Again this time I dont need initrd.

So it is logical that Dom0 must boot, but it fails actually. That is
why I find the situation very strange.


> > 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.
OK, I will do that, as it is not desired to buy a serial card :-)

Thanks,
Jun

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