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RE: Multifunction devices
If I recall correctly, 'ghost' config spaces on multifunction devices
violates the PCI spec and PC'99 requirements. This problem is should not be
expected in any new silicon.
> -----Original Message-----
> From: firstname.lastname@example.org [mailto:email@example.com]
> Sent: Thursday, 25 May, 2000 02:22
> To: firstname.lastname@example.org
> Subject: Multifunction devices
> We have a custom IC that just had first silicon show up in
> our lab. It is a
> multifunction device with two functions. So far we have
> found one problem in
> the PCI interface
> That problem is that the device issues a DEVSEL# for config
> space accesses to
> all 8 possible functions. The result is that we have 2
> functioning config spaces
> and 6 config spaces that have read-only registers that contain 0's.
> This is not a good thing, but I think it is a problem that
> can be lived with.
> The BARs return all 0's when read so the system won't
> allocate any space to
> the 6 extra devices, and we won't conflict with any other
> config spaces.
> Does anyone see a problem with not spending the time and
> money on fixing this
> if it remains that only bug?