[uml-user] problems in ubd0 load

[gowri s. <gow...@ya...>]

The UML doesn't load and gives the following problem
'VFS: Cannot open root device "ubd0" or 62:00'

I was working with the 2.4.18um which didn't give any
problems. But once I upgraded the kernel to 2.4.22 I
cannot load the UML :-( I tried searching the mailing
list for the problem But I could not solve it

I execute linux through
./linux ubd0=cowfs,root_fs mode=tt eth0=daemon

Any inputs in this will be very helpful. I don't know
what mistake I'm making.

This is the Output:
-------------------

tracing thread pid = 23097
Linux version 2.4.22-5um (gshankar@moretti) (gcc
version 2.95.4 20011002 (Debian prerelease)) #8 Mon
Nov 3 16:47:47 CST 2003
On node 0 totalpages: 8192
zone(0): 8192 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: ubd0=cowfs,root_fs mode=tt
eth0=daemon root=/dev/ubd0
Calibrating delay loop... 758.46 BogoMIPS
Memory: 29132k available
Dentry cache hash table entries: 4096 (order: 3, 32768
bytes)
Inode cache hash table entries: 2048 (order: 2, 16384
bytes)
Mount cache hash table entries: 512 (order: 0, 4096
bytes)
Buffer cache hash table entries: 1024 (order: 0, 4096
bytes)
Page-cache hash table entries: 8192 (order: 3, 32768
bytes)
Checking for host processor cmov support...Yes
Checking for host processor xmm support...No
Checking that ptrace can change system call
numbers...OK
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No,
enabling workaround
POSIX conformance testing by UNIFIX
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society
NET3.039
Initializing RT netlink socket
Starting kswapd
devfs: v1.12c (20020818) Richard Gooch
(rg...@at...)
devfs: boot_options: 0x1
pty: 256 Unix98 ptys configured
SLIP: version 0.8.4-NET3.019-NEWTTY (dynamic channels,
max=256).
loop: loaded (max 8 devices)
PPP generic driver version 2.4.2
Universal TUN/TAP device driver 1.5 (C)1999-2002 Maxim
Krasnyansky
SCSI subsystem driver Revision: 1.00
blkmtd: error: missing `device' name

Initializing software serial port version 1
Netdevice 0 : daemon backend (uml_switch version 3) -
unix:/tmp/uml.ctl
mconsole (version 2) initialized on
/u/gshankar/.uml/MlJjKZ/mconsole
Failed to lock 'cowfs', err = 13
unable to open cowfs for validation
UML Audio Relay (host dsp = /dev/sound/dsp, host mixer
= /dev/sound/mixer)
Initializing stdio console driver
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 2048 bind
2048)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
VFS: Cannot open root device "ubd0" or 62:00
Please append a correct "root=" boot option
Kernel panic: VFS: Unable to mount root fs on 62:00

Thanks
Gowri

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