Date: Tue, 8 Nov 2016 07:46:00 -0700 (MST) From: Warren Block <wblock@wonkity.com> To: Ian Smith <smithi@nimnet.asn.au> Cc: Manish Jain <bourne.identity@hotmail.com>, freebsd-questions@freebsd.org Subject: Re: How to restore FreeBSD boot manager on GPT disk ? Message-ID: <alpine.BSF.2.20.1611080742440.74332@wonkity.com> In-Reply-To: <20161108231123.T41537@sola.nimnet.asn.au> References: <mailman.140.1478606402.80500.freebsd-questions@freebsd.org> <20161108231123.T41537@sola.nimnet.asn.au>
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On Tue, 8 Nov 2016, Ian Smith wrote: > In freebsd-questions Digest, Vol 649, Issue 3, Message: 3 > On Tue, 8 Nov 2016 10:49:23 +0000 Manish Jain <bourne.identity@hotmail.com> wrote: > > > One thing I have loved about FreeBSD over the years is the superbly > > designed Boot Easy boot manager. If any other OS overwrites the MBR, it > > is straightforward to restore with 'boot0cfg -B /dev/ada0' > > > > That command only works on MBR disks though, as far as I know. Is there > > any equivalent command on a GPT disk ? > > Sadly, no. Noone has written a GPT equivalent of boot0cfg; perhaps it's > too hard, or developers perceive no use for multi-booting; I don't know. > > Often people will suggest using the GPL'd GRUB; I suppose that works ok > with GPT disks these days. You could research rather more complicated > Boot Environments, about which I know nothing, but I don't think these > enable a choice between e.g. BSD/s|Linux/s|Window/s systems as boot0cfg > does. [ Corrections to any misperceptions are welcome! ] > > Jack L. offered: > gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ada0 > > which restores the PMBR and GPT bootblocks to ada0p1, but that's not > (yet?) able to provide or restore multi-boot options as such. > > Are you forced to use GPT, because of UEFI-only motherboards? If the machine is booting in BIOS from a GPT disk, it *should* work to put boot0 on there, replacing the PMBR. I think, anyway, have not tested it.
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