MP 1,1-5,1 Legacy BIOS Windows 11 upgrade from cMPro

[haralds]

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]

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.

 

[haralds]

Not sure what you mean by "csm."
Just to confirm, does it use legacy BIOS?

 

[Dayo]

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]

 

[haralds]

Thanks. I am still learning (supposed to be a quote by DaVinci in his old age.)

 

[Macschrauber]

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 ;-)

 

[haralds]

👍