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>
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[-- Attachment #1 --] 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 the following questions: > > - 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 when 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. -- WBR, Andrey V. Elsukov [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) iQEcBAEBAgAGBQJQI5egAAoJEAHF6gQQyKF6QvgH/iPjNJAIYAUuEAa07+mN+TA5 flaGVh3IAYPX6azxkbntjQ3UHmSn9supba+6hLNfMrgNOYdmKdntfFL1WVJR8Tah lkmThWSV5IeLZM/L41G8k4bPe0cwGHhxupYqzG6pddMZamK8pNm2ERsZUBtSYidi L75ZvR3VTfl5lvRmKMzAZ5pKBjFsDBUVh3XMQ6HzZpGvIwH86t1mmZuspZSIr/Kf P65GZUFiNOOJ02xVjKIQR8ljJQM1BnMZ8K8qIurIvK+xaZVRn06EdgvGSJgDSZgX ibG8icV2apwON/trxst0cYXaOlP+CCEJr9H/SStJ8L1mtAN3NS6Tagez16sTEkM= =hjMX -----END PGP SIGNATURE-----help
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