Date: Tue, 22 Nov 2011 03:50:04 +1100 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Bruce Cran <bruce@cran.org.uk> Cc: freebsd-questions@freebsd.org Subject: Re: 9.0 and bsdinstall - avoiding updating the MBR Message-ID: <20111122030531.U72022@sola.nimnet.asn.au> In-Reply-To: <20111121101201.6336C10656E5@hub.freebsd.org> References: <20111121101201.6336C10656E5@hub.freebsd.org>
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In freebsd-questions Digest, Vol 390, Issue 1, Message: 18 On Mon, 21 Nov 2011 01:47:27 +0000 Bruce Cran <bruce@cran.org.uk> wrote: > I'm planning to install FreeBSD alongside a whole range of Windows > builds for testing. In 8.x it's possible to tell the installer not to > bother updating the MBR so you can use something like EasyBCD to boot it > via the Windows bootloader instead. Is it still possible on 9.0-RC2 > using bsdinstall? I don't seem to remember seeing any option to avoid > writing out the new boot code. Hi, I gather not (yet?) Can save the MBR with (eg) 'boot0cfg -f ~/mymbr adaX' for safety, dd it back if need be, and/or use fdisk(8) -p, -t and -f flags to save, test and restore just the slice table. At least they're precautions I'm taking, really not wanting to clobber win2k (for BIOS updates :), 8.2-RELEASE or a shared UFS partition when next trying to install 9.0-RC2 to slice 2, currently 7.4-RELEASE .. % boot0cfg -v ad0 # flag start chs type end chs offset size 1 0x00 0: 1: 1 0x0b 1023: 5:63 63 8385867 2 0x00 1023:255:63 0xa5 1023: 13:63 8385930 125821080 3 0x00 1023:255:63 0xa5 1023: 15:63 134207010 33543342 4 0x80 1023:255:63 0xa5 1023: 14:63 167750730 66685815 version=2.0 drive=0x80 mask=0xf ticks=182 bell=# (0x23) options=packet,update,nosetdrv volume serial ID a8a8-a8a8 default_selection=F4 (Slice 4) % fdisk -p ad0 # /dev/ad0 g c232581 h16 s63 p 1 0x0b 63 8385867 p 2 0xa5 8385930 125821080 p 3 0xa5 134207010 33543342 p 4 0xa5 167750730 66685815 a 4 cheers, Ian
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