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RE: clk detection..

> what are the minimum requirements that the BIOS looks
> for inorder to allow a PCI CLK signal to be given to a
> PCI slot? is it that at a minimum, only a device id
> and vendor id need be seen during config. reads for
> the same? or are there any other signals, etc.. that
> ought to be seen?
I think there are no standards for this, so it would be platform

A BIOS might also (or alternatively) check that at least one of the
PRSNTn# signals is asserted.

It might even evaluate which PRSNTn# pins are asserted and evaluate
whether it can supply enough power to the card in the slot; but in that
event it probably should take more action than merely disabling the CLK
to that slot.