Date: Tue, 8 Nov 2016 23:52:45 +1100 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Manish Jain <bourne.identity@hotmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: How to restore FreeBSD boot manager on GPT disk ? Message-ID: <20161108231123.T41537@sola.nimnet.asn.au> In-Reply-To: <mailman.140.1478606402.80500.freebsd-questions@freebsd.org> References: <mailman.140.1478606402.80500.freebsd-questions@freebsd.org>
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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? cheers, Ian
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