Re: Cannot create BIOS ANDUEFI ISO

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

> the binary generated will not boot unless the EFI option is checked

Did you check whether the ISO has boot lures for legacy PC-BIOS ?

With a dowloaded Debian Live ISO, these lures are reported by

  xorriso -indev debian-live-12.0.0-amd64-standard.iso -report_el_torito plain -report_system_area plain

as

  ...
  El Torito images   :   N  Pltf  B   Emul  Ld_seg  Hdpt  Ldsiz         LBA
  El Torito boot img :   1  BIOS  y   none  0x0000  0x00      4        4285
  ...
  System area summary: MBR isohybrid cyl-align-off GPT APM
  ...

The "El Torito boot img" line with "BIOS" indicates bootability by
legacy PC-BIOS from real or emulated optical media .
The word "isohybrid" in the "System area summary" indicates that the MBR
code is ready to execute the El Torito boot image for booting by legacy
PC-BIOS from real or emulated hard disk or USB stick.

If these initial boot lures present, then the problem is in later stages
of boot software, e.g. in the ISOLINUX menu or in the initrd.


> I have installed grub-pc-bin

AFAIK, Debian Live uses SYSLINUX/ISOLINUX as BIOS boot equipment.
The necessary binaries are in  binary package "isolinux".
El Torito boot image:

  /usr/lib/ISOLINUX/isolinux.bin

MBR code for using the boot image from hard disk or USB stick:

  /usr/lib/ISOLINUX/isohdpfx.bin


Have a nice day :)

Thomas