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  • Where has you got "use this PE32 machine code which is independent of CPU architecture or ISA"? en.wikipedia.org/wiki/Portable_Executable : PE is the standard executable format in EFI environments.[2]. And following [2]: "The most distinguishing feature of UEFI Images is that the first set of bytes in the UEFI Image file contains an image header that defines the encoding of the executable image....#define EFI_IMAGE_MACHINE_x64 0x8664..." So as I understood code is specific for each ISA. But maybe you have more sensible source and reason. Commented Dec 15, 2021 at 7:43