is PCITAG big enough for future expansion?

[Alan Cox]

On Iau, 2005-07-21 at 02:59 +1000, Dave Airlie wrote:
> I'm not fully up on the PCI spec, but what are the defined sizes for the
> 
> domain, bus, device and function
> 
> can these become larger than 255? we munge them all into an unsigned


device + function is 8bits (8 functions, 32 slots)
bus is 8bits

domain to X is a bit different to domain to the PCI space I suspect. A
system can have multiple unconnected PCI busses that are not part of a
domain (ie dont share config space)

I also don't know what the new PCI replacements do to all these values,
and that may be more important ?