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

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

> -----Original Message-----
> From: Keir Fraser [mailto:keir@xxxxxxxxxxxxx] 
> Sent: 13 June 2007 10:45
> To: Jun Koi; Petersson, Mats
> Cc: xen-devel
> Subject: Re: [Xen-devel] Xen doesnt recognize my root fs, 
> while native kernel can ???
> 
> 
> That's fine. My conclusion is that this is user error: you 
> are trying to
> mount /boot/sda2 and you actually mean /dev/sda2.

Well spotted. I just expected it to say "/dev/" rather than "/boot/". 

--
Mats
> 
>  -- Keir
> 
> On 13/6/07 10:21, "Jun Koi" <junkoi2004@xxxxxxxxx> wrote:
> 
> > Here is the screenshot taken with a digital camera. I hope 
> the screen
> > is clear enough for you to see.
> > 
> > Thanks,
> > Jun
> > 
> > 
> > 
> > On 6/13/07, Jun Koi <junkoi2004@xxxxxxxxx> wrote:
> >> 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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