[jeroenhd]

I think the problem here is that ReactOS wants to keep Windows compatibility. Don't forget ReactOS started out as an NT5 clone; I doubt porting Windows XP's NTLDR to UEFI would be as trivial as you may think it is.

The source code for the bootloader doesn't seem all that complicated: https://github.com/reactos/reactos/tree/master/boot/freeldr Basic support seems to be finished, but there are still a few open tasks regarding EFI support: https://jira.reactos.org/browse/CORE-9841?jql=labels%20%3D%2....

Based on https://jira.reactos.org/browse/CORE-16175, I think the project is using Microsoft's bootloader to load the ReactOS kernel during the testing phase. If that's the level of compatibility they're going for, I can imagine implementing full UEFI support will take ages.

[Kwpolska]

Some people have supposedly made Windows XP boot under UEFI by using some stuff from Windows Longhorn/Vista/7: https://www.betaarchive.com/forum/viewtopic.php?p=456492#p45...

[zamadatix]

As soon as I read UEFI in the news letter I knew this forum post would end up in the comments :). The newsletter is about UEFI class 3, I.e. no CSM, where that is not. There are some later posts in that thread about using UefiSeven which is a project which hacks minimal int10h support but at that point you might as well just have modified freeloader for proper support instead.