Hi Scott,
Any configuration access to
unimplemented functions should be master aborted. Your device probably
is not doing that. Hence the BIOS beleives that 8 functions are
implemented.
When the BIOS understands that it is a multifunction
device(from HeaderType), it finds out the number of implemented functions
by finding out which of them respond to config accesses.
The header type of all implemented
functions should have their MSB bit
set.
Rgds,
Sudeep
-----Original Message-----
From: Scott
Davis [mailto:sdavis@Futurex.com]
Sent: Friday,
May 17, 2002 10:59 PM
To: 'pci-sig@znyx.com'
Subject: Multifunction Add-In
Cards and PCI BIOS Enumeration
I've designed a multifunction PCI
Add-In card that uses the QuickLogic
QL5130 ESP for the bus interface.
The card has two functions so I've
created two configuration register sets --
one for each function. When the
PC BIOS enumerates the bus, it reports
that the card has been found and then
lists 8 functions -- the first two
functions correctly and then 6 unknown
functions. I've set the MSB of
the Header byte for both functions. My
questions are as
follows:
Has anyone seen this type of behavior before?
How do I
suppress the listing of the 6 unknown functions?
Should I be setting the MSB
of both header
bytes?
Thanks,
Scott
**************************Disclaimer************************************ Information contained in this E-MAIL being proprietary to Wipro Limited is 'privileged' and 'confidential' and intended for use only by the individual or entity to which it is addressed. You are notified that any use, copying or dissemination of the information contained in the E-MAIL in any manner whatsoever is strictly prohibited. ***************************************************************************