10.9 Unable to see secondary PCI Bus on Dell Precision T7600 - is a DSDT fix possible?

[giffinmike3000]

So here's what the situation seems to be:

The Dell Precision T7600 has a secondary PCI Bus with two additional slots at the top of chassis, which are only active when there is a second CPU in the system.

I have this 2nd CPU installed (2 CPUs total) - so in Windows - and Linux - I can happily use these additional two slots without any issue.

 

However, no matter what DSDT I use (From Linux or Windows), compiled, patched in MaciASL - with the SSDT's or without -- I cannot for the life of me, get OSX to see the cards I have installed in these two slots. 

I've also tried manually creating the plist file, converting it to hex and using the device-properties boot flag (I'm currently using Chameleon for the boot loader)  -- nothing gets either of the cards to show up.

 

 

I am very unfamiliar with DSDT modifying, but I'm typically pretty good at hacking these types of things, but frankly I am lost. I can't find any guide or help for DSDT on how to do anything but add Graphics Cards - nothing on how to add a secondary PCI Bus to the system.  I've tried adapting the articles and posts and guides to conform to my situation, but I assume I am either missing something simple, or way off on the wrong track here.

 

I've verified the cards work fine in OSX86 by moving them to the lower slots - and they indeed work fully as intended once moved to the lower 'normal' slots.

 

Unfortunately this is not a solution for me, because I have those lower slots filled with other cards. 

 

Honestly, I'm not clear if a DSDT hack is really the fix here - it looks like OSX just wont scan the second PCI Bus, even with the proper DSDT.aml in place. 

 

 

Any ideas or help would be extremely appreciated. 

 

 

Thank you

 

 

[giffinmike3000]

haha - ok, I hope this helps someone -- 30 minutes after I posted this I found the solution for my problem on my own.

 

I set the # of PCI Busses under 'PCI Bus Configuration' in the BIOS, from 64 PCI Buses to *256 PCI Buses*  -- and set the MMIO Space Size to 'small' 

and all the missing cards just showed up.