xen doesn't support "Framebuffer console support"properly

xen doesn't support "Framebuffer console support"properly

[Andrew Liu]

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

xen doesn't support "Framebuffer console support"properly

[Andrew Liu]

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

RE: [Xen-tools] xen doesn't support "Framebuffer consolesupport"properly

[Robert Mortimer]

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
>
>
>
> _______________________________________________
> Xen-tools mailing list
> Xen-tools@lists.xensource.com
> http://lists.xensource.com/xen-tools
>

Re: RE: [Xen-tools] xen doesn't support "Framebuffer consolesupport"properly

[Mathieu Ropert]

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
>>
>>
>>
>>_______________________________________________
>>Xen-tools mailing list
>>Xen-tools@lists.xensource.com
>>http://lists.xensource.com/xen-tools
>>
>>    
>>
>
>
>_______________________________________________
>Xen-devel mailing list
>Xen-devel@lists.xensource.com
>http://lists.xensource.com/xen-devel
>  
>