From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mathieu Ropert <mro@adviseo.fr>
Subject: Re: RE: [Xen-tools] xen doesn't support "Framebuffer
	consolesupport"properly
Date: Tue, 25 Apr 2006 11:31:19 +0200
Message-ID: <444DEC67.2080204@adviseo.fr>
References: <000c01c667af$05f974d0$5f00000a@rmortimer>
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To: Robert Mortimer <rmortimer@bluechiptechnology.co.uk>
Cc: xen-tools@lists.xensource.com, Andrew Liu <liushengping@tsinghua.org.cn>, xen-devel@lists.xensource.com
List-Id: xen-devel@lists.xenproject.org

Basically, *any* screen output require access to video memory :)
However, Xen offer a virtual console facility to domU so they can output 
things, but it's a text-only console (although they are some projects of 
providing a virtual framebuffer support).
Dom0 has direct access to video memory so it shouldn't be a problem to 
use framebuffer on it.

Mathieu

Robert Mortimer wrote:

>Is this a DomU or a Dom0 kernel?
>
>>>From my scant understanding the following is true:-
>
>only Dom0 gets to see the true hardware still runs above the hypervisor
>
>If frambuffer mode requires direct access to hardware then it may not work.
>I am not positive but does frambuffer involves direct writing to video
>memory
>
>DomU gets to see idealized Xen hardware and presumably uses some sort of Xen
>video driver.
>
>DomU does no direct rendering to screen instead it uses VNC
>
>I may however be so so wrong as I am a bit new to this
>
>Robert
>
>  
>
>>-----Original Message-----
>>
>>When I turn on the "Framebuffer console support" in compiling kernel,
>>after system startup, the console doesn't work properly and the kernel
>>parameter( for example: vga=719) doesn't do any effect on kernel.
>>
>>who can help me ?
>>thanks in advance!
>>Andrew Liu
>>
>>
>>
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>>http://lists.xensource.com/xen-tools
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>>
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