51 lines
2.0 KiB
Plaintext
51 lines
2.0 KiB
Plaintext
$OpenBSD: README,v 1.1 2010/11/08 20:12:13 jasper Exp $
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GRUB's configuration file is /grub/menu.lst which is described in detail
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in GRUB's info page. A minimal menu.lst looks like this:
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default 0
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timeout 5
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title OpenBSD
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root (hd0,3)
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chainloader +1
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GRUB is currently not able to directly load the OpenBSD kernel, so you have
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to use the chainloader. To activate GRUB, you have to run grub-install like
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this:
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# grub-install --no-floppy hd0
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It will install GRUB in the MBR of your first harddrive. grub-install will
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run very slowly if the floppy drive is probed without disk in it.
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See GRUB's info page for further details and caveats(!) of this method.
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To completely deinstall GRUB, you have to delete /grub and install a new
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bootloader into your bootdisk's MBR (look at fdisk(8)'s -u option).
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Booting multiple OpenBSD instances from the same disk
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When setting up multiple instances of OpenBSD on a single disk, you have
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to make sure OpenBSD is installed into primary partitions only. These have
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to end on cylinder boundaries like this
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# fdisk sd0
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Disk: sd0 geometry: 17873/255/63 [287129745 Sectors]
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Offset: 0 Signature: 0xAA55
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Starting Ending LBA Info:
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#: id C H S - C H S [ start: size ]
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------------------------------------------------------------------------
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0: A6 11751 0 1 - 15667 254 63 [ 188779815: 62926605 ] OpenBSD
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1: A6 7834 0 1 - 11750 254 63 [ 125853210: 62926605 ] OpenBSD
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2: A6 3917 0 1 - 7833 254 63 [ 62926605: 62926605 ] OpenBSD
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*3: A6 0 1 1 - 3916 254 63 [ 63: 62926542 ] OpenBSD
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When booting, the kernel will use the disklabel from the first OpenBSD
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partition found, therefor grub has to set the partition type of unused
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partitions to another value as can be seen in
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${TRUEPREFIX}/share/examples/grub/menu.lst. The type of the last
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partition, in this case partition 3, has to stay at 0xa6 in all cases,
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otherwise grub won't be able to find its /grub/menu.lst file. This means
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you have to install grub in the OpenBSD partition with the largest number.
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