[Xen-devel] Re: [PATCH][RFC] gfx_passthru: warning when vgabios rom has invalid checksum

[Weidong Han <weidong.han@xxxxxxxxx>]

Noboru Iwamatsu wrote:
> Hi,
>
> According to the "PCI Firmware Spec Rev 3.0",
> the system firmware have to write the new checksum after resizing
> the expansion ROM area.
>
> So, when re-using the shadowed VGABIOS, the checksum must
> be valid, and if it is invalid, we should consider the BIOS has
> a bug or memory area is corrupted.
>
> This patch just add the warning message when checksum requires
> recalculation.
>
> I tried this following environments.
>
> Intel DX58SO + GeForce GTS250:        checksum is OK.
> Intel DX58SO + GeForce 9600GT:        checksum is OK.
> Fujitsu Q35 M/B + IGD:                checksum is bad.
>   
What does "checksum is bad" mean here?
> What do you think, Weidong?
> Is just warning enough? Or, should we stop loading the rom?
>
>   
Does it still work or not when checksum is bad? If it works, we should
not stop loading the rom.

Regards,
Weidong
> Regards,
> Noboru.
>   


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