On 05/10/2021 15:18, Dean Westhead wrote:
Yes ... that is what i have been trying .... and failing ! hehe !

it all "makes" without any errors and after installing the xorriso package the 
genfsimg runs without any errors too.

The only problem is that the outputted combined.iso will not boot a Dell UEFI 
laptop and RUFUS only sees the ISO as BIOS only too.

If I copy over to the src/util directory the old geniso file and add the rule 
into into the Makefile.pcbios to use it, the resultant
ISO file works fine on both BIOS and UEFI machines.

The ISO file is also about 1Mb smaller when created with the genfsimg than with 
the geniso file .... almost like it is failing to add the
bin-x86_64-efi/ipxe.efi file.

Did you try comparing the contents of the .iso images generated through both methods, including the contents of the embedded UEFI boot image (the ESP)?

Michael
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