At last, I've managed to test ASUS Prime X299-A II after 2 months of sitting at home.
The patched BIOS and SSDT for CPU did the 'start' magic.
Other SSDTs were adapted from ASUS Prime X299-A.
GC-Titan Ridge controller was flashed with a patched firmware (thanks to @CaseySJ and @Elias64Fr...
Because, as I wrote, GRUB shell says that the register is 0x00 already.
But there might be a problem with the current M/B because it can't shut down from Windows and some times from BIOS (it stucks with 00 on POST coder and the fan on the card run at 100%).
I'm trying to configure a new Prime X299-A II for upcoming builds (as Prime X299-A is out of stock everywhere) and have a very weird problem (considering the current progress with the updated X299 M/Bs).
The Catalina installer is not booting - hangs on +++++++++++.
In BIOS (version...
I've spent a few hours flashing and then checking 4* GC-Titan Ridge controllers (for future builds) last Thursday.
All 4 flashed w/o issues.
All 4 worked on Windows.
But only 2 worked on macOS:banghead::crazy:.
Then I noticed (Thunderbolt software panel on Windows) that non-working on...