Date: Thu, 9 Apr 1998 09:49:40 PDT From: "Marty Leisner" <leisner@sdsp.mc.xerox.com> To: questions@FreeBSD.ORG Subject: booting freebsd (multiple slices on a disk) Message-ID: <9804091649.AA17011@gnu.sdsp.mc.xerox.com>
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I tried to install the 2/22 snapshot
on a PC (already running 2.2).
My disk layout (from linux fdisk) is:
: leisner@compudyne;bsdfdisk -l
Disk /dev/hda: 64 heads, 63 sectors, 826 cylinders
Units = cylinders of 4032 * 512 bytes
Device Boot Begin Start End Blocks Id System
/dev/hda1 1 1 127 256000+ 6 DOS 16-bit >=32M
/dev/hda2 * 128 128 534 820512 5 Extended
/dev/hda3 825 825 825 2016 a OS/2 Boot Manager
/dev/hda4 535 535 686 306432 b5 Unknown
/dev/hda5 * 128 128 254 256000+ 7 OS2 20.0
/dev/hda6 * 255 255 381 256000+ 7 OS2 20.0
/dev/hda7 * 382 382 407 52384+ 83 Linux native
/dev/hda8 408 408 509 205600+ 83 Linux native
/dev/hda9 510 510 534 50368+ 6 DOS 16-bit >=32M NO NAME
Disk /dev/hdb: 64 heads, 63 sectors, 621 cylinders
Units = cylinders of 4032 * 512 bytes
Device Boot Begin Start End Blocks Id System
/dev/hdb1 1 1 152 306400+ b5 Unknown
/dev/hdb2 153 153 254 205632 6 DOS 16-bit >=32M
/dev/hdb3 255 255 431 356832 b5 Unknown
Warning: invalid flag 0000 of partition table 4 will be corrected by w(rite)
Disk /dev/hdd: 64 heads, 63 sectors, 621 cylinders
Units = cylinders of 4032 * 512 bytes
I'm using system commander (it changes the a5 ID to b5 [don't ask
me why...freebsd still boots]
When I tried to install on /dev/hda, it complained:
This region cannot be used for your root partition as the
FreeBSD boot code cannot deal with a root partition created
in that location.
Is this because it began at a cylinder > 512? (On the other hand,
OS/2 Bootmanager doesn't have a problem).
So I tried to put it on another slice on /dev/hdb (/dev/hdb3).
The install went OK (it would help enormously to give some indication
of the sizes when you install a system, instead of crunching for an hour
before running out of space). I can boot either /dev/hdb1 or /dev/hdb3
in system commander, but the system where is installed is always /dev/hdb1
(2.2).
I don't see support in there for multiple slices (did I miss something?)
It seems like if disk.c:devopen() got a parameter indicating the
disk slice, it would only look there (can it identify its disk slice
its running from?)
The alternative is to write a cheezy program which munges the
disk label magic number on the partition I don't want to boot...
marty leisner@sdsp.mc.xerox.com
Don't confuse education with schooling.
Milton Friedman to Yogi Berra
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