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these are for embedded boards though

Does that mean it can't be used for desktop PCs? I remember using it in the past but on a vm.

I won't use it myself, but it's linux, it's technically possible to use it in and out a vm anywhere

SkiffOS also supports desktop PCs (with the intel/desktop layer) + EFI with rEFInd / GRUB. Also supports the Steam Deck.