| primo |
06-02-2006 11:33 PM |
FreeBSD + NetBSD @ same hard disk
With a bit of disklabel black magic I'm able to access FreeBSD partitions from NetBSD but I couldn't otherwise. All I can do is access the NetBSD root partition with the device file of the entire slice (in my case /dev/ad3s2).
I have a Western Digital 80GB with /dev/ad3s1 containing FreeBSD 6.1, /dev/ad3s2 with NetBSD 3.0 and /dev/ad3s3 being an extended DOS partition that contains /dev/ad3s5 formatted with ext2 to contain some Linux distro to install later. When I tried adding a disklabel for /dev/ad3s2 from FreeBSD I could no longer boot from NetBSD. It's strange because disklabel in NetBSD does not touch (or so it seems) the raw hard drive, only the kernel's idea of it. I hoped that FreeBSD would do the same and with a reboot I would have those /dev/ad3s2[a-z] files to access individual NetBSD partitions. I will install NetBSD again. The goal isn't to recreate those bits in /dev/ad3s2 so my question is:
how can I access NetBSD partitions from NetBSD ?
NetBSD magic:
disklabel wd1
Code:
# /dev/rwd1d:
type: unknown
disk: WDC WD800BB-00J
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 16
sectors/cylinder: 1008
cylinders: 155061
total sectors: 156301488
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0 # microseconds
track-to-track seek: 0 # microseconds
drivedata: 0
16 partitions:
# size offset fstype [fsize bsize cpg/sgs]
a: 1573488 46154745 4.2BSD 1024 8192 46280 # (Cyl. 45788*- 47349*)
c: 32001480 46154745 unused 0 0 # (Cyl. 45788*- 77535*)
d: 156301488 0 unused 0 0 # (Cyl. 0 - 155060)
e: 23634576 47728233 4.2BSD 2048 16384 28256 # (Cyl. 47349*- 70796*)
f: 2597616 71362809 4.2BSD 2048 16384 27240 # (Cyl. 70796*- 73373*)
g: 4195800 73960425 4.2BSD 2048 16384 21880 # (Cyl. 73373*- 77535*)
i: 78140097 78156288 Linux Ext2 0 0 # (Cyl. 77536 - 155055*)
k: 46154682 63 unused 0 0 # (Cyl. 0*- 45788*)
l: 2097152 63 4.2BSD 2048 16384 28552 # (Cyl. 0*- 2080*)
m: 2662400 2097215 4.2BSD 2048 16384 28552 # (Cyl. 2080*- 4721*)
n: 8388608 4759615 4.2BSD 2048 16384 28512 # (Cyl. 4721*- 13043*)
o: 33006522 13148223 4.2BSD 2048 16384 28552 # (Cyl. 13043*- 45788*)
My /etc/fstab was:
Code:
/dev/wd1a / ffs rw 1 1
/dev/wd1e /usr ffs rw,softdep 1 2
/dev/wd1f /var ffs rw,nodev,nosuid 1 2
/dev/wd1g /home ffs rw,nodev,nosuid,softdep 1 2
kernfs /kern kernfs rw
# The linux option is used to emulate some files like /proc/cpuinfo
procfs /proc procfs rw,linux
# Linux swap
/dev/wd0j none swap sw 0 0
# Linux ext2
/dev/wd1i /mnt/wd ext2fs ro,nosuid,nodev 0 0
# FreeBSD 6.1
/dev/wd1l /mnt/bsd6/root ufs ro,nosuid,nodev 0 0
/dev/wd1m /mnt/bsd6/var ufs ro,nosuid,nodev 0 0
/dev/wd1n /mnt/bsd6/home ffs ro,nosuid,nodev,softdep 0 0
/dev/wd1o /mnt/bsd6/usr ufs ro,nosuid,nodev,softdep 0 0
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