Re: ISO installer image: GPT versus MBR partitions

["pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de>]

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