Date: Mon, 17 Sep 2012 17:27:57 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: jhb@freebsd.org (John Baldwin) Cc: freebsd-hardware@freebsd.org Subject: Re: Booting from 3TB drive (UFS, BIOS) Message-ID: <201209171527.q8HFRw8q048154@lurza.secnetix.de> In-Reply-To: <201209170850.09992.jhb@freebsd.org>
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John Baldwin wrote: > On Monday, September 17, 2012 8:41:09 am Oliver Fromme wrote: > > Problem is, the machine doesn't have an EFI BIOS and does > > *not* support GPT. So it will use the compatibility MBR > > of the GPT, I assume. And MBR isn't able to represent > > addresses beyond 2 TB, so the slice containing the boot > > partition will have to be within the first 2 TB of the > > drive, right? > > No. > [...] > We support booting from GPT without EFI. It will work fine. The BIOS will > see a PMBR that does indeed only cover 2TB, but that doesn't matter. The > whole point of the PMBR is to fool BIOSs. :) Tools that understand GPT (such > as gpart) will see the GPT table and it's partitions. FreeBSD's GPT bootstrap > code (/boot/pmbr and /boot/gptboot) will see the GPT and use 64-bit LBAs for > all I/O, so they can handle the partition being anywhere on the disk. Ok, now I got it. Thanks for bearing with me. :) Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd "Share your knowledge. It is a way to achieve immortality." -- The Dalai Lama
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