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IABSD.fr/ports/sysutils/grub/pkg/README
ajacoutot
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$OpenBSD: README,v 1.2 2011/06/02 13:41:41 ajacoutot Exp $ +----------------------------------------------------------------------- | Running ${FULLPKGNAME} on OpenBSD +----------------------------------------------------------------------- GRUB's configuration file is /grub/menu.lst which is described in detail in GRUB's info page. A minimal menu.lst looks like this: default 0 timeout 5 title OpenBSD root (hd0,3) chainloader +1 GRUB is currently not able to directly load the OpenBSD kernel, so you have to use the chainloader. To activate GRUB, you have to run grub-install like this: # grub-install --no-floppy hd0 It will install GRUB in the MBR of your first harddrive. grub-install will run very slowly if the floppy drive is probed without disk in it. See GRUB's info page for further details and caveats(!) of this method. To completely deinstall GRUB, you have to delete /grub and install a new bootloader into your bootdisk's MBR (look at fdisk(8)'s -u option). Booting multiple OpenBSD instances from the same disk When setting up multiple instances of OpenBSD on a single disk, you have to make sure OpenBSD is installed into primary partitions only. These have to end on cylinder boundaries like this # fdisk sd0 Disk: sd0 geometry: 17873/255/63 [287129745 Sectors] Offset: 0 Signature: 0xAA55 Starting Ending LBA Info: #: id C H S - C H S [ start: size ] ------------------------------------------------------------------------ 0: A6 11751 0 1 - 15667 254 63 [ 188779815: 62926605 ] OpenBSD 1: A6 7834 0 1 - 11750 254 63 [ 125853210: 62926605 ] OpenBSD 2: A6 3917 0 1 - 7833 254 63 [ 62926605: 62926605 ] OpenBSD *3: A6 0 1 1 - 3916 254 63 [ 63: 62926542 ] OpenBSD When booting, the kernel will use the disklabel from the first OpenBSD partition found, therefor grub has to set the partition type of unused partitions to another value as can be seen in ${TRUEPREFIX}/share/examples/grub/menu.lst. The type of the last partition, in this case partition 3, has to stay at 0xa6 in all cases, otherwise grub won't be able to find its /grub/menu.lst file. This means you have to install grub in the OpenBSD partition with the largest number.