How to patch DSDT after upgrading CPU

[deeveedee]

I am using a DSDT that was a perfect match for my system. It was created by someone else, so I got lucky and don't really know what it took to pach the DSDT. Everything worked perfectly. I upgraded my Core2Duo CPU to a Xeon E5450 (quad core, socket 771 > 775 conversion) and had to add boot flag 'npci=0x3000' in order to boot.

Does my need to add the boot flag indicate that I need to patch my DSDT? If so, can I patch the current DSDT (for the Core2Duo CPU) or do I need to create a new DSDT and start from scratch? If I can start with the current DSDT, how do I patch it with MaciASL to reflect the CPU upgrade?

Thank you for any advice and assistance.

 

[deeveedee]

After reading multiple threads, it seemed that the best approach was to start fresh with a new DSDT (also good since I obtained the DSDT which was based on someone else's similar but not identical system). I extracted the DSDT using Clover F4, decompiled the DSDT/SSDT and fixed/patched the new DSDT with MacIASL. My system still requires boot flag 'npci=0x3000' in order to boot with working video. I'm running El Capitan on the Xeon E5450 without any problems. When patching the DSDT, I applied the ALC662 patch and still have VoodooHDA 2.8.7 kext installed. Sound works perfectly, but I may experiment with vanilla HDA kext to see if it works.

 

[mrjayviper]

I don't think you need to patch DSDT. just create a new SSDT?