Just pushed a hacky commit[1] to an "efildr_hack" branch at git.zytor.com/users/sha0/syslinux.git The commit message goes: This introduces support for chaining to tianocore's EDK2's DUET's EFILDRs. You should use EFILDR for FAT12, EFILDR16 for FAT16, EFILDR32 or EFILDR64 (depending on the architecture) for FAT32. Usage: chain.c32 efildr=<filename> where <filename> is the appropriate EFILDR filename. Might be handy for anyone wanting to boot DUET from Syslinux. Not suggested for Syslinux master, as it is hacky. - Shao Miller [1] http://git.zytor.com/?p=users/sha0/syslinux.git;a=commitdiff;h=d3c25645c8b9a cf4280734fabf836678d1aa8cab