On Fri, Apr 19, 2019 at 11:01:51AM +0200, Thomas Schmitt wrote: > Hi, > > i wrote: > > > this is the xorriso run for producing a layout like "isohybrid --uefi" > > Florian Pelz wrote: > > No, it still gets stuck. :( > > Then it must be something inside the EFI partition which makes the > Macbook firmware dismiss the partition for booting. > >
For x86_64 iso images, the Macbook does *not dismiss*. It gets stuck in the lightgray startup screen forever without showing a menu with the drives to boot from, except for the Debian ISO image, for which a menu is shown with an »EFI partition« that runs a bootloader when chosen. > Can you get EFI to confess that the x86_64 USB stick indeed has a > recognizable EFI partition ? > > I do not currently know how. Maybe by changing the bootx64.efi on its EFI partition? > > I could try burning a DVD and attempt to boot from it. > > On DVD the El Torito boot equipment should lead EFI to the same partition > image as the partition table should do on USB stick. > But a try cannot harm. > > Will try now. > For now i say thanks for three found bugs in my own software, during > this discussion: > I am happy something good came of it. Regards, Florian