Re: PCI Card causing PC to Hang

["Kevin Brace" <kevinbraceusenet@hotmail.com>]

Have you used a logic analyzer to see what is going on the PCI bus?
If the card you are talking about is freezing up the computer, that probably 
means that the card is claiming the transaction by asserting DEVSEL#, but is 
not asserting TRDY# to end the transfer.
Since this card freezes up your computer during before booting an operating 
system, possibly a burst Configuration cycle might be occurring.
You shouldn't assume that a burst Configuration cycle will never occur 
because I heard some Intel chipsets do initiate a burst Configuration cycle, 
and to interrupt (Nothing to do with INTx#.) a burst Configuration cycle, 
you should assert STOP# at the same time TRDY# gets asserted.



Kevin Brace (In general, don't respond to me directly, and respond within 
the mailing list.)



>From: Alex Huntley <Alex.Huntley@renishaw.com>
>To: "'pci-sig@znyx.com'" <pci-sig@znyx.com>
>Subject: PCI Card causing PC to Hang
>Date: Thu, 30 May 2002 10:22:11 +0100
>
>Greetings
>
>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
>space.
>
>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
>appreciated.
>
>Many thanks
>
>Alex Huntley
>
>--------------------------------------
>Design Engineer
>Renishaw plc
>New Mills
>Wotton-under-Edge
>Gloucestershire
>GL12 8JR
>United Kingdom
>
>Tel. +44 (0) 1453 524524
>Fax.+44 (0) 1453 524201
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