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

[Keir Fraser <keir@xxxxxxxxxxxxx>]

An easy mistake to make, and to overlook.

 K.

On 13/6/07 10:56, "Jun Koi" <junkoi2004@xxxxxxxxx> wrote:

> What a shame!!! I think I should go hanging myself!!!
> 
> Good bye forever! Best wishes to you and Xen project!!!!!
> 
> Jun
> 
> On 6/13/07, Petersson, Mats <Mats.Petersson@xxxxxxx> wrote:
>> 
>> 
>>> -----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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