URL:
<http://savannah.gnu.org/bugs/?46716>
Summary: Protective MBR partition is not marked as bootable
Project: GNU GRUB
Submitted by: patrakov
Submitted on: Сбт 19 Дек 2015 11:37:38
Category: Booting
Severity: Major
Priority: 5 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Originator Name: Alexander E. Patrakov
Originator Email: [email protected]
Open/Closed: Open
Discussion Lock: Any
Release:
Release: 2.02~beta1
Reproducibility: Every Time
Planned Release: None
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Details:
Some old BIOSes (including the one in Intel DG965SS desktop board) refuse to
treat a USB drive as bootable if it has no bootable MBR partitions. This
applies to all iso images that are created by grub-mkrescue and written to a
USB flash drive with dd.
Changing the byte at offset 0x1be to 0x80 in the resulting iso makes it
bootable on such boards.
Images produced by xorriso with isolinux as recommended at
http://www.syslinux.org/wiki/index.php/Isohybrid do have 0x80 at offset 0x1be,
so I think it is a bug in GRUB, not in xorriso.
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