Date: Tue, 22 May 2007 10:21:47 +0200 From: Arne Schwabe <schwabe@uni-paderborn.de> To: Ivan Voras <ivoras@fer.hr> Cc: freebsd-hackers@freebsd.org Subject: Re: GPT boot loader? Message-ID: <4652A81B.1070301@uni-paderborn.de> In-Reply-To: <f2u7pf$7as$1@sea.gmane.org> References: <f2u7pf$7as$1@sea.gmane.org>
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Ivan Voras schrieb: > Hi! > > I've had the opportunity to talk to Adam Martin, Marcel Moolenaar and > Peter Wemm about making GPT bootable, but not all of them at the same > time, so I'd like this thread to be the meeting point on the subject. > > (Adam and Peter have offered to modify the boot loader chain, but > differently.) > > Summary: > > The idea is to replace bsdlabels with GPT. The problem is that GPT is > intended to be used with EFI and not to be bootable by regular BIOS > machines. For FreeBSD, there are two distinct cases: > > 1. the machine is GPT-only, there are no other MSDOS and bsdlabel partitions > 2. the machine is dual-boot or has some other need to retain MSDOS > partitions. > > The second case is more convoluted as it means the MBR will hold a > regular MSDOS partition table, and one of those partitions will hold a > GPT - which is trivially done with GEOM but completely non-standard. > 3. Use the GPT + MBR Format EFI Macs use. It has a normal MBR and a GPT and the MBR mirrors a subset of the GPT. The most challenging but conforms with EFI/GPT Arne
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