[SeaBIOS] [Qemu-devel] [PATCH 1/2] pci: Automatically patch PCI device id in PCI ROM

Gerd Hoffmann kraxel at redhat.com
Mon Oct 18 12:09:23 CEST 2010

On 10/15/10 23:05, Anthony Liguori wrote:
> On 10/15/2010 03:51 PM, Stefan Weil wrote:
>> PCI device with different device ids sometimes share
>> the same rom code. Only the device id and the checksum
>> differ in a boot rom for such devices.
> BTW, SeaBIOS doesn't reject ROMs when they're loaded via rombar, only
> when they're loaded via romfile.

SeaBIOS rejects them when loaded from the rom bar and doesn't reject 
them when loaded via fw_cfg.

Using the rom bar is the prefered way though, fw_cfg is only there for 
compatibility with older versions.

> Maybe it's better to use fw_cfg to explicitly tell SeaBIOS to ignore the
> PCI device id in the rom header for a certain device?

Patching the rom is fine IMHO.  Why create + use a separate 
communication path when we can use a much simpler approach?


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