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Re: [Xen-devel] Vesa compatible card not detected by dom0 kernel

from [Jan Beulich]

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To:	"Miao Feng" <miaofeng@xxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] Vesa compatible card not detected by dom0 kernel
From:	"Jan Beulich" <JBeulich@xxxxxxxxxx>
Date:	Fri, 16 Dec 2005 14:18:03 +0100
Cc:	'xen-devel' <xen-devel@xxxxxxxxxxxxxxxxxxx>
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>>> "Miao Feng" <miaofeng@xxxxxxxxxxxxxxxx> 16.12.05 13:51:56 >>>
>Hi list:
>
>   i found that my vesa card can't be detected by the dom0 kernel and
>subsequently vesafb can't be brought up successfully, we do not
mention
>X.org system here. Seems that it is caused by the absence of the
video
>probing code, that originally packed in linux kernel (video.S).
>
>   that code is 16-bit mode oriented, but not feat for dom0 booting
up
>procedure. Do you think it is reasonable to past it on xen kernel?

No, it is not. The para-virtualized kernel starts in protected mode,
and hence can't (without complications) execute real-mode code.

Jan

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