Xen devel - Jul 2006 - RE: [Xen-ia64-devel] Re: [PATCH] Add lost logic for VGAinitialization

>From: Keir Fraser
>Sent: 2006年7月26日 15:15
>
>
>On 26 Jul 2006, at 05:46, Zhang, Xiantao wrote:
>
>> This patch adds lost logic for vga initialization. It was lost after
>> changing to new Qemu.
>> Signed-off-by : Kevin Tian <kevin.tian@intel.com>
>> Signed-off-by : Zhang Xiantao <xiantao.zhang@intel.com>
>
>How come the new qemu code seems to have perfectly working VGA
>without
>this patch?
>
>  -- Keir
>
It''s IA64 specific. On xen/x86, vga bios is copied to 0xD0000 by guest 
firmware. However on ia64 platform, native firmware depends on some 
initialization vga state at power on and so does guest firmware. That''s
why that vga bios initialization stub is required for vti domain, to match 
platform requirement.

Thanks
Kevin

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On 26 Jul 2006, at 09:54, Tian, Kevin wrote:
>
> It''s IA64 specific. On xen/x86, vga bios is copied to 0xD0000 by
guest
> firmware. However on ia64 platform, native firmware depends on some
> initialization vga state at power on and so does guest firmware.
That''s
> why that vga bios initialization stub is required for vti domain, to 
> match
> platform requirement.
Thanks, makes sense.

  -- Keir


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