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

From: Alexander E. Patrakov
Subject: Re: [Bug-xorriso] grub-mkrescue does not boot on older Macs as USB stick
Date: Fri, 25 Dec 2015 22:35:56 +0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0

(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

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