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haralds

macrumors 68030
Original poster
Jan 3, 2014
2,984
1,246
Silicon Valley, CA
I am running OpenCore, but boot Mojave/Windows 10 "natively" using legacy BIOS boot and prefer to keep it that way. On my MacBook Pro 2018, I upgraded to Windows 11 using some registry entries using UEFI boot.

Has anybody run this configuration? Reverting is a bit of a PITA. I will create an image using WinClone, but at >1TB on my Windows install it's a bit of a PITA.
 

Macschrauber

macrumors 68030
Dec 27, 2015
2,976
1,483
Germany
I have a csm Windows 11 in my drawer sitting on a spinner.

I updated it a while ago with the registry change on a MP3,1 with a Kepler GPU running Win natively.
 

Dayo

macrumors 68020
Dec 21, 2018
2,256
1,278
The Compatibility Support Module (CSM) is what (U)EFI units, such as cMP, use to boot Legacy Bootcode. It provides compatibility with the older/legacy, pre (U)EFI, boot process. That is, CSM [INSERT SOMETHING HERE] = Legacy [INSERT SAME HERE]
 

Macschrauber

macrumors 68030
Dec 27, 2015
2,976
1,483
Germany
Yes, I sometimes write csm/bios/legacy. But I thought as a legacy Windows 10 is installed and legacy is wanted this should be clear ;-)
 
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