There are 2 new quirks:
- ResizeGpuBars : Control BAR size for over all system
- ResizeAppleGpuBars : Control BAR size specific to macOS. Supposedly macOS max BAR size is 1GB and using 1GB broke sleep for me so I am using 256 MB.
I ended up setting ResizeGpuBars to 16 GB (integer 14) and ResizeAppleGpuBars 256 MB (integer 8) . I am on x299 with RX6900XT and now I can finally enable resizeable BAR in windows and boot to macOS. Very happy with this feature so just wanted to share with everyone.
FYI when you first enable resizeble BAR in bios windows will give you a popup "Windows has detected a change in your hardware please restart blah blah" . You will have to restart before AMD catalyst lets you enable resizeable BAR.
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