[ipxe-devel] Generating a BIOS/UEFI hybrid ISO image

Michael Brown mcb30 at ipxe.org
Thu Oct 7 14:03:06 UTC 2021

On 07/10/2021 14:52, Dean Westhead wrote:
> Sorry ... I didnt want to take lots of your time if it is only me having this issue and everyone else is working fine.
> In the old "working" ISO, there is the following files :
> boot.cat
> efiboot.img
> ipxe.krn
> isolinux.bin
> isolinux.cfg
> The new one that isnt seen as a EFI bootable disk has :
> boot.catalog
> esp.img
> ipxe.lkrn
> isolinux.big
> isolinux.cfg
> I will open the EFI image too and see what is in that as soon as i can and let you know about that too.

Thanks!  Most of those files are for BIOS booting: the relevant ones for 
UEFI are efiboot.img/esp.img, which should both be FAT filesystem images 
containing a file \EFI\Boot\BootX64.efi (which should be the ipxe.efi 


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