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Dear Linux Kernel readers,
I'm wondering if someone can help me with a problem: I'm trying to
use NFSROOT to store all my Linux files on an HP/UX machine. But there
seems to be a bug in either the HP/UX NFS server, or the Linux NFS
client.
The bug is that the major number of any character or block device
which is stored on the HP box, is shown as "0" on the Linux box.
The symptoms of this is that on booting, the kernel can't open
/dev/tty1, and I get the message "Unable to open initial console".
I have attached a transcript which shows this problem, using the tty*
char device files as an example.
I would appreciate ideas from anyone who could tell me how to go
about finding:
i) Whether the problem is on the HP/UX side or the Linux side, and
ii) How to get some diagnostic information which shows this.
Many thanks,
Mitch.
-- | mailto:mjd#NOSPAM@nsmd.aus.hp.com | Not an official view of: | | mailto:mjd#NOSPAM@alphalink.com.au | Telecom Management Divn | | Remove the #NOSPAM to send me mail | Hewlett Packard Australia |--------------C6830A62C94 Content-Type: text/plain; charset=us-ascii; name="typescript" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="typescript"
Script started on Fri Jan 2 19:39:41 1998 hpiw0234:/# uname -a Linux hpiw0234 2.0.33 #15 Fri Jan 2 19:22:18 EST 1998 i486 unknown
hpiw0234:/# grep tty /etc/groups tty::5:
/* Note that on the linux box, group ID 5 is "tty". The owner/group IDs of * tty0 is 0, 5. */
hpiw0234:/# cd /dev hpiw0234:/dev# ls -l tty tty[0-9] crw-rw-rw- 1 root tty 5, 0 Jul 18 1994 tty crw------- 1 root tty 4, 0 Jul 18 1994 tty0 crwx-w---- 1 root tty 4, 1 Jan 2 19:39 tty1 crwx-w---- 1 root tty 4, 2 Jan 2 19:40 tty2 crw--w--w- 1 root root 4, 3 Jan 2 19:27 tty3 crw--w--w- 1 root root 4, 4 Jan 2 19:27 tty4 crw--w--w- 1 root root 4, 5 Jan 2 19:27 tty5 crw--w--w- 1 root root 4, 6 Jan 2 19:27 tty6 crw-rw-rw- 1 root tty 4, 7 Jul 18 1994 tty7 crw-rw-rw- 1 root tty 4, 8 Jul 18 1994 tty8 crw-rw-rw- 1 root tty 4, 9 Jul 19 1994 tty9
/* Note that the major/minor number of tty0 is 4, 0. */
hpiw0234:/dev# telnet taco
/* Taco is an HPUX 10.20 box */
Trying 99.99.99.99... Connected to taco. Escape character is '^]'. HP-UX taco B.10.20 A 9000/778 200999999 two-user license
login: mjd Password: mjd@taco [~] cd /mnt/taco/d0001/mjd/linux/dev
/* This is where I'm storing my NFSROOT Linux volume.
mjd@taco [/mnt/taco/d0001/mjd/linux/dev] ls -l tty tty[0-9] crw-rw-rw- 1 root daemon 5 0x000000 Jul 18 1994 tty crw------- 1 root daemon 4 0x000000 Jul 18 1994 tty0 crwx-w---- 1 root daemon 4 0x000001 Jan 2 16:56 tty1 crwx-w---- 1 root daemon 4 0x000002 Jan 2 16:58 tty2 crw--w--w- 1 root root 4 0x000003 Jan 2 16:52 tty3 crw--w--w- 1 root root 4 0x000004 Jan 2 15:54 tty4 crw--w--w- 1 root root 4 0x000005 Jan 2 15:54 tty5 crw--w--w- 1 root root 4 0x000006 Jan 2 15:54 tty6 crw-rw-rw- 1 root daemon 4 0x000007 Jul 18 1994 tty7 crw-rw-rw- 1 root daemon 4 0x000008 Jul 18 1994 tty8 crw-rw-rw- 1 root daemon 4 0x000009 Jul 19 1994 tty9
mjd@taco [/mnt/taco/d0001/mjd/linux/dev] id daemon uid=1(daemon) gid=5(daemon)
/* Note that on the HP box, GID 5 is daemon. This is just what I want. * Note also that tty0 has the correct major/minor number: 4, 0. * Now let's try and see if the problem is the HP NFS server, by * mounting it to the HP. */
mjd@taco [/mnt/taco/d0001/mjd/linux/dev] cd / mjd@taco [/] su2 Password for user mjd:
root@taco [~] cd / root@taco [/] mount -F nfs taco:/mnt/taco/d0001 /mnt2 root@taco [/] cd /mnt2/mjd/linux/dev root@taco [/mnt2/mjd/linux/dev] ls -l tty tty[0-9] crw-rw-rw- 1 root daemon 5 0x000000 Jul 18 1994 tty crw------- 1 root daemon 4 0x000000 Jul 18 1994 tty0 crwx-w---- 1 root daemon 4 0x000001 Jan 2 16:56 tty1 crwx-w---- 1 root daemon 4 0x000002 Jan 2 16:58 tty2 crw--w--w- 1 root root 4 0x000003 Jan 2 16:52 tty3 crw--w--w- 1 root root 4 0x000004 Jan 2 15:54 tty4 crw--w--w- 1 root root 4 0x000005 Jan 2 15:54 tty5 crw--w--w- 1 root root 4 0x000006 Jan 2 15:54 tty6 crw-rw-rw- 1 root daemon 4 0x000007 Jul 18 1994 tty7 crw-rw-rw- 1 root daemon 4 0x000008 Jul 18 1994 tty8 crw-rw-rw- 1 root daemon 4 0x000009 Jul 19 1994 tty9 root@taco [/mnt2/mjd/linux/dev] exit
/* No, that looks fine. tty0 has major/minor numbers of 4, 0. * So let's try mounting it to the Linux box... */
mjd@taco [/] exit logout Connection closed by foreign host.
hpiw0234:/# mount -t nfs -o rw taco:/mnt/taco/d0001/mjd/linux /mnt hpiw0234:/# cd /mnt/dev hpiw0234:/mnt/dev# ls -l tty tty[0-9] crw-rw-rw- 1 root tty 0, 0 Jul 18 1994 tty crw------- 1 root tty 0, 0 Jul 18 1994 tty0 crwx-w---- 1 root tty 0, 1 Jan 2 16:56 tty1 crwx-w---- 1 root tty 0, 2 Jan 2 16:58 tty2 crw--w--w- 1 root root 0, 3 Jan 2 16:52 tty3 crw--w--w- 1 root root 0, 4 Jan 2 15:54 tty4 crw--w--w- 1 root root 0, 5 Jan 2 15:54 tty5 crw--w--w- 1 root root 0, 6 Jan 2 15:54 tty6 crw-rw-rw- 1 root tty 0, 7 Jul 18 1994 tty7 crw-rw-rw- 1 root tty 0, 8 Jul 18 1994 tty8 crw-rw-rw- 1 root tty 0, 9 Jul 19 1994 tty9
/* Oops, the minor number is preserved, but the major number is 0. Ouch! */
hpiw0234:/dev# exit Script done on Fri Jan 2 19:42:25 1998
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