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<DIV><SPAN class=727402620-28042006><FONT face=Arial color=#800000 size=2>I've
looked at the original BIOS source and the internal versions of the
documentation, and here's what I've determined: As near as I can tell, you
cannot disable the PCI header for the device at 00:12:4. The original BIOS
(written by others on the BIOS team here at AMD in Colorado) virtualized the PCI
headers via SMM code, and that header was masked when internal graphics were
disabled. Without SMM code, you cannot do the same
thing.</FONT></SPAN></DIV>
<DIV><SPAN class=727402620-28042006><FONT face=Arial color=#800000
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=727402620-28042006><FONT face=Arial color=#800000
size=2>Interesting info/notes:</FONT></SPAN></DIV>
<DIV><SPAN class=727402620-28042006><FONT face=Arial color=#800000 size=2>If you
disable memory space via the PCI header (PCI header register 04, bit 1 -- clear
to zero), you should disable it somewhat.</FONT></SPAN></DIV>
<DIV><SPAN class=727402620-28042006><FONT face=Arial color=#800000
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=727402620-28042006><FONT face=Arial color=#800000 size=2>If the
F4 Video Configuration trap bit (F0, Index 42h, bit 1) is set, the system will
generate SMIs when trying to access the PCI header registers. This should
be clear for a non-SMM system.</FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#800000 size=2></FONT> </DIV>
<DIV><SPAN class=727402620-28042006><FONT face=Arial color=#800000 size=2>I
suppose you could special-case the device in your PCI scan/enumeration code, but
that is probably more kludgy than you'd like. Could you reduce the
device's resource requirements to zero?</FONT></SPAN></DIV><!-- Converted from text/rtf format -->
<P><SPAN lang=en-us><FONT face=Arial color=#800000 size=2> --
Steve G.<BR></FONT><BR><B></B><B></B><B><FONT face=Arial color=#0000ff
size=2>Steve Goodrich</FONT></B><FONT face=Arial></FONT> <FONT face=Arial
color=#0000ff size=2>(</FONT></SPAN><A
href="mailto:Steven.Goodrich@amd.com"><SPAN lang=en-us><U></U><U></U><U><FONT
face=Arial color=#0000ff
size=2>Steven.Goodrich@amd.com</FONT></U></SPAN></A><SPAN lang=en-us><FONT
face=Arial color=#0000ff size=2>)</FONT><BR><FONT face=Arial size=2>Advanced
Micro Devices, Inc.<BR>1351 S. Sunset Street</FONT><BR><FONT face=Arial
size=2>Mail Stop 83-36</FONT><BR><FONT face=Arial size=2>Longmont, CO
80501</FONT><BR><FONT face=Arial size=2>303-774-5129 (fax:
303-774-5801)<BR><A
href="http://www.amd.com/embeddedprocessors">http://www.amd.com/embeddedprocessors</A></FONT><FONT
face=Arial> </FONT></SPAN></P>
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