Re: [Bug-xorriso] grub-mkrescue does not boot on older Macs as USB stick

["Alexander E. Patrakov" <patrakov@gmail.com>]

(all of the testing below was actually performed by Robert Jones, I only 
built the ISOs)

25.12.2015 01:17, Andrei Borzenkov пишет:
> 23.12.2015 22:37, Alexander E. Patrakov пишет:
>> Bytes 0x3e .. 0x1fe: x86 bootstrap code, which is not executed and thus
>> is likely not significant.
>>
>
> Wanna bet?
>
> Could you test if the attached patch works for you on newer Mac? Note,
> that it still does not detect EFI bootable USB stick if it is inserted
> before power on - only when you stop in boot manager and insert stick.

I cannot confirm this finding. The ISOs made before the fix hang the 
boot manager if booted from a USB flash drive. The ISOs made with the 
fix boot correctly (and show exactly one "EFI Boot" entry) both when 
cold-plugged and when hot-plugged.

The testing was done with grub commit id a9399f2.

> It also still does not boot from the second (unknown) EFI suggested for
> CD. But this second choice is also present only when CD is inserted
> before power on - it is not shown if CD is inserted in boot manager.

Not tested.

> I also do not get "Windows" menu choice on USB. May be because there is
> no active partition.

Even if I add a one-sector bootable partition of type 0 (as done by 
xorriso 1.4.3 with -DLibisofs_protective_msdos_plus_boot_dummY 
-DLibisofs_pmpbd_on_lba0), it doesn't show "Windows" when booted from USB.

-- 
Alexander E. Patrakov