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PCI Card causing PC to Hang


At Renishaw I've been working on a PCI card, which we've found causes
certain PCs to hang as the BIOS is running, just before the operating system
gets called. I've exhausted the tests I can think of and I've tested our
card with the Foxfire 2 card from PCI-SIG and everything appears to be okay.

Our card is I/O mapped with three 256 byte BAR spaces. The Foxfire card
tests running without our card in the PC indicate that there are no other
I/O mapped PCI devices on the bus which should cause any conflict of I/O

This only happens on certain PC's. We have one PC here which the card causes
to hang and the Foxfire card tests show that this PC runs "Configuration
Mechanism #2". The foxfire card tests show that the good PC, which our card
does work with, is running "Configuration Mechanism #1". 

Could somebody explain what the difference between these two mechanisms is,
or suggest where I could find this information out from?

Any other suggestions as to potential causes of our problem would also be

Many thanks

Alex Huntley

Design Engineer
Renishaw plc
New Mills
GL12 8JR
United Kingdom

Tel. +44 (0) 1453 524524
Fax.+44 (0) 1453 524201

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