Not enough address space

[Mark Yeager <yeager@rtviz.com>]

Hi,

What happens when the devices on the PCI bus request more address space
than the system has available?  

The PCI spec does not outline the expected system behavior for this
failure mode.  Is it up to the system manufacturer to decide what to do?

We make a card that has jumpers to control the amount of PCI memory
address space that the card requests.  Since we can respond to 64 bit
addresses, we can request up to 2 GB, way too much for most machines now
out there.

My bet is that the system simply will fail to boot.  Other engineers
here wonder if the system will allocate less address space than
requested.

And, if the system fails to boot, how does the user know that this is
the reason?  (So we can document when to change the jumpers.)

Thanx
MOY
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