Date: Wed, 21 Aug 2013 16:49:30 +0000 From: nox@FreeBSD.ORG (Juergen Lock) To: Thomas Mueller <mueller6724@bellsouth.net> Cc: "Andrey V. Elsukov" <ae@FreeBSD.org>, freebsd-stable@freebsd.org, Juergen Lock <nox@FreeBSD.ORG> Subject: Re: Change in loader or kernel: won't boot with kfreebsd in grub2 Message-ID: <20130821164930.GA57350@hub.freebsd.org> In-Reply-To: <289442.11660.bm@smtp105.sbc.mail.gq1.yahoo.com> References: <289442.11660.bm@smtp105.sbc.mail.gq1.yahoo.com>
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On Tue, Aug 20, 2013 at 02:54:44PM -0700, Thomas Mueller wrote: > This is what /cdrom/isolinux/isolinux.cfg shows for Super Grub2 Disk entry: > > LABEL grubdisk > MENU LABEL SGD: Super Grub2 Disk > kernel memdisk > append initrd=/bootdisk/grubdisk.img floppy raw > > This is from the latest SysRescCD beta. > > Now I wonder how or if one can access a CD or DVD from GRUB2. > > GRUB2 has (hd0) (hd1) (fd0) but no (cd) or (cd0). > Not sure about a physical cd but booting an iso should be possible using either memdisk from grub2 like in the posting I linked, http://ubuntuforums.org/showthread.php?t=1549847&page=13&p=10818457#post10818457 _or_ also using grub2's own loopback command like described here: http://michael-prokop.at/blog/2009/05/25/boot-an-iso-via-grub2/ (but btw the super grub disk iso should also boot directly when dd'd to an usb key, not only when burned to a cd/dvd.) It could only be that the partition table on your disk is somehow messed up/has leftover data from a previous install that confused loader and might confuse grub2 too so that it doesn't find the FreeBSD install... > I also wonder how or if one can boot a FreeBSD partition from GRUB2 or syslinux. > That's what super grub disk's autodetection should now detect correctly, if you want to write a grub.cfg entry manually (or type it live from a grub2 rescue shell) an example is also here: http://forums.freebsd.org/showthread.php?p=85122#post85122 but note as I said before if you want to boot a 9.1+ kernel directly w/o loader you need a grub 2.00 version that has the patch mentioned here: (that's now in debian and in FreeBSD ports but might not be in other grub2 versions floating around) http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=699002 > Tom > HTH, :) Juergen
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