Date: Fri, 10 Aug 2012 12:31:39 +0400 From: "Andrey V. Elsukov" <ae@FreeBSD.org> 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: <5024C6EB.1040109@FreeBSD.org> In-Reply-To: <50246E2C.1070604@freebsd.org> References: <50237B73.9040301@freebsd.org> <5023979B.4010903@yandex.ru> <5023A907.7060800@freebsd.org> <C43A8456-1B69-47BE-AFB5-3288CD16E789@xcllnt.net> <50246E2C.1070604@freebsd.org>
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[-- Attachment #1 --] On 10.08.2012 6:13, Lawrence Stewart wrote: >> What about the following: We have the kernel keep track of the firmware >> used. On x86 this is either BIOS or UEFI in the common case. Other F/W >> implementations like U-Boot, OFW, etc are possible as well, especially >> on non-x86 machines. >> >> The geom_part scheme uses this information to determine how to behave >> with respect to the PMBR. When booted with BIOS, non-standard stuff is >> accepted by virtue of what we've seen in the field. With UEFI we can >> start off being anal (read: strictly compliant) and extend out based >> on what we run into. >> >> In particular: this way we also don't mess up the EFI/GPT support that >> is there on ia64. >> >> Thoughts? It seems this is not enough. The problem, that Lawrence has, is not related to BIOS/UEFI. Automatic detection of various standard violation is handy for our users, but sometimes false positives occur. To solve all problems it seems we need to introduce several quirks, e.g.: #define GPT_QUIRK_BOOTCAMP 0x0001 /* boot camp supported */ #define GPT_QUIRK_MSLOADER 0x0002 /* don't set Active flag to the PMBR entry */ #define GPT_QUIRK_IGNOREPMBR 0x0004 /* don't require PMBR entry */ The same quirks should be added to the loader(8). -- WBR, Andrey V. Elsukov [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) iQEcBAEBAgAGBQJQJMbxAAoJEAHF6gQQyKF69JMIAJtcBy9l2eLRvPhJ1YMW/SBP 7hWXYHodzAyrBUCvRzTgA3x7wbHfsCsR0qDi7CKUyfPN/4WQlP8l0SzLgssV357r z3Ly3/7wiOaCLV0Kw70/J7h0zay2IO8ab/WioVfckm/13K7/hoUxw6FSNbMfkUFT 68acW67W4XzEPInh9PndtnAjv4cGg9k1ShrUaLa22XJC2OjGMDGY2p33AXY+zoWM vdq7VxE2dNciCt/uGdA+eQw9PvZLrvh4j8i/PJCa9VZxNaLimoSLQxeCSMw7Gr5h vutnkSH1axhFiFWVBUkk1Rn8MEoYuz72P/8seqypGCEscDDTqzg/otF0y5wTq58= =1aut -----END PGP SIGNATURE-----
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