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Re: [Bug-xorriso] Acer Aspire V5-121 doesn't see USB ISO as bootable

From: Thomas Schmitt
Subject: Re: [Bug-xorriso] Acer Aspire V5-121 doesn't see USB ISO as bootable
Date: Sun, 26 Feb 2017 17:24:34 +0100


Carlo Caione wrote:
> "mbr_only" and "mbr_only_copy" both work fine only with the
> partition type 0x00.

I am happy to see that "mbr_only" is still a viable alternative
to nested partitions like in Ubuntu's ISO.

So i will introduce a xorrisofs option to set the MBR partition type of
the ISO filesystem partition. My advise is then to stay with "mbr_only"
as general layout.

> Are you planning to add a new mode to your grub-mkrescue-sed.sh script?

The new option (let's call it -iso_mbr_part_type for now) may then
be added to the arguments of the grub-mkrescue run which uses
xorriso-1.4.7/frontends/grub-mkrescue-sed.sh as "xorriso".

There was an intermediate version interval, when grub-mkrescue demanded
an argument "--" between its options and those for xorrisofs. My
2.02~beta2-36 in a Debian Sid VM needs it, but current git based versions
do not any more, as don't do old versions. So first one will try

  grub-mkrescue ... -iso_mbr_part_type 0x00

and if it complains
  grub-mkrescue: invalid option -- 'i'
then one will use the intermediatly demanded "--" argument:

  grub-mkrescue ... -- -iso_mbr_part_type 0x00

I will now begin to develop this new option (and its library API calls
and its xorriso command). I'll give you a note when a new xorriso-1.4.7
development snapshot tarball is uploaded for testing.

The wish to set the partition type will not be fulfillable if the
layout includes a standards conformant GPT, because there the MBR
partition must have type 0xee (and cannot be mountable anyways).
CHRP prescribes MBR partition type 0x96 for the whole ISO.

Have a nice day :)


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