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Date:      Thu, 09 Aug 2012 14:57:31 +0400
From:      "Andrey V. Elsukov" <bu7cher@yandex.ru>
To:        Lawrence Stewart <lstewart@freebsd.org>
Cc:        "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org>, Marcel Moolenaar <marcel@FreeBSD.org>
Subject:   Re: gpart rewrites pmbr in a way which breaks Win 7 EFI bootloader
Message-ID:  <5023979B.4010903@yandex.ru>
In-Reply-To: <50237B73.9040301@freebsd.org>
References:  <50237B73.9040301@freebsd.org>

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On 09.08.2012 12:57, Lawrence Stewart wrote:
> After identifying the cause of the problem and a workaround (please see=
 the README.txt at the above
> URL for full details and pre/post gpart dumps of the MBR+GPT), I have t=
he following questions:
>=20
> - Should gpart be writing 0x80 (active) in the protective MBR entry?

AFAIK, this was added because some BIOS could not boot without it.

>   - Why is Windows EFI bootloader so sensitive to 0x80 in pmbr?

This question you should ask to the Microsoft. :)

> - Should gpart be silently rewriting the protective MBR entry at all wh=
en only asked to make changes
> to the GPT?

The PMBR is part of GPT metadata described in the UEFI spec. So, I think =
it can.

--=20
WBR, Andrey V. Elsukov




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