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> There's 0 need to build MBRs for > EFI At least gptmbr.bin might come to mind (after all, GPT is part of the UEFI specs). Isohybrid with UEFI options perhaps too? > and I'm looking at why utils/ depends on mbr/ isohybrid(.pl) and mkdiskimage come to mind here? I'm not saying for certain these are the reasons for such dependencies, but they might (and perhaps

...urce code looks like a BIOS MBR program which shall search the "active" partition in GPT rather than in the MBR partition table. See comments about "EBIOS" detection and "CHS" addresses in https://github.com/geneC/syslinux/blob/master/mbr/gptmbr.S "Active" partitn would be the one which has bit 2 set in the Attributes field (byte offset 48 to 55) of its GPT entry: "Legacy BIOS Bootable". So indeed, EFI on hard disk does not need more of an MBR than the magic number at bytes 510, 511 and an MBR partition entry of type 0xEE or 0xEF. > > and...

...OS MBR program which shall search > the "active" partition in GPT rather than in the MBR partition table. > See comments about "EBIOS" detection and "CHS" addresses in > https://github.com/geneC/syslinux/blob/master/mbr/gptmbr.S > > "Active" partitn would be the one which has bit 2 set in the Attributes > field (byte offset 48 to 55) of its GPT entry: "Legacy BIOS Bootable". That's the main goal of gptmbr.bin: to be able to boot a GPT scheme in _BIOS_ mode. > So indeed, EFI on hard disk does not need more of an MBR t...