Re: booting from wd0b / raidframe

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On Wed, Dec 09, 2009 at 09:27:44PM +0000, David Laight wrote:
> Look at sys/arch/i386/stand/bootxx/boot1.c, rules foe finding /boot are:
> 
> 1) Try for a filesystem at the start of the 'type 169' partition
> 2) Add 64 sectors and try again
> 3) Look at disklabel (2nd sector of ptn) info for 'a'
> 3a) If 'a' is FS_RAID, add 64 sectors
> 3b) look for fs.
> 
> Once an fs is located (probbaly looking for magic numbers) then try
> to open /boot itself.

1)

Partition table:
0: NetBSD (sysid 169)
    start 63, size 1953525105 (953870 MB, Cyls 0-121601/80/63), Active
Bootselector disabled.
First active partition: 0

 wd0b:   4195233        63       swap             # (Cyl.      0*- 4161)

So no filesystem there.


2)

# dd if=/dev/rwd0b skip=64 bs=512 count=1 | hexdump -C
00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
|................|
*

So nothing there either.


3)

Disklabel found:

# dd if=/dev/rwd0b skip=1 bs=512 count=1 | hexdump -C
1+0 records in
1+0 records out
512 bytes transferred in 0.023 secs (22260 bytes/sec)
00000000  57 45 56 82 05 00 00 00  72 61 69 64 00 00 00 00  |WEV.....raid....|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000020  00 00 00 00 00 00 00 00  00 02 00 00 3f 00 00 00  |............?...|
00000030  10 00 00 00 65 92 1d 00  f0 03 00 00 b0 6d 70 74  |....e........mpt|
00000040  00 00 00 00 00 00 00 00  10 0e 01 00 00 00 00 00  |................|
d_headswitch, d_trkseek, d_flags, d_drivedata[0]:
00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
d_spare[4], d_magic2, d_checksum, d_npartitions, d_bbsize
00000080  00 00 00 00 57 45 56 82  71 55 07 00 00 20 00 00  |....WEV.qU... ..|
                      |wd0a
                      v
00000090  00 20 00 00 b0 ff 3f 01  e0 03 40 00 00 00 00 00  |. ....?...@.....|
p_fstype
000000a0  13 00 00 00 a1 03 40 00  3f 00 00 00 00 00 00 00  |......@.?.......|
000000b0  01 00 00 00 71 6d 70 74  3f 00 00 00 00 00 00 00  |....qmpt?.......|
000000c0  00 00 00 00 b0 6d 70 74  00 00 00 00 00 00 00 00  |.....mpt........|
000000d0  00 00 00 00 10 02 80 07  90 03 80 01 00 00 00 00  |................|
000000e0  13 00 00 00 70 02 80 25  a0 05 00 09 00 00 00 00  |....p..%........|
000000f0  13 00 00 00 a0 65 f0 45  10 08 80 2e 00 00 00 00  |.....e.E........|
00000100  13 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000110  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|

p_fstype = 0x13 = 19 = FS_RAID => 3a) is true.

p_offset = 0x4003e0 = 4195296, 4195296 + 64 = 4195360, and its
partition table will be in 4195360 + 1

3b)

# dd if=/dev/rwd0d skip=4195361 bs=512 count=1 | hexdump -C
1+0 records in
1+0 records out
512 bytes transferred in 0.001 secs (512000 bytes/sec)
00000000  57 45 56 82 0e 00 00 00  72 61 69 64 30 00 00 00  |WEV.....raid0...|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000020  00 00 00 00 00 00 00 00  00 02 00 00 80 00 00 00  |................|
00000030  08 00 00 00 ff 4f 00 00  00 04 00 00 00 ff 3f 01  |.....O........?.|
00000040  00 00 00 00 00 00 00 00  10 0e 01 00 00 00 00 00  |................|
00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000080  00 00 00 00 57 45 56 82  86 43 05 00 00 20 00 00  |....WEV..C... ..|
                      |raid0a
                      v
00000090  00 20 00 00 00 00 40 00  00 00 00 00 00 00 00 00  |. ....@.........|
000000a0  07 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000000b0  00 00 00 00 00 ff 3f 01  00 00 00 00 00 00 00 00  |......?.........|
*
000000d0  00 00 00 00 00 ff ff 00  00 00 40 00 00 00 00 00  |..........@.....|
000000e0  07 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000000f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000200

p_fstype = 7 = FS_BSDFFS

and

/dev/raid0a on / type ffs (local)
# ls -l /boot
-r--r--r--  1 root  wheel  65276 Dec  8 17:36 /boot


Yet I can boot from the network, but not from the disk...
(pxeboot nfs:netbsd, raid0:rootfs)
(I think in the previous email I checked the mbr, and bootxx, so this is
becoming a mystery... All I can think of to try next is a newer NetBSD60
as opposed to the NetBSD40 bootxx combination)

Cheers,

Patrick