[Lguest] VFS: Cannot open root device "lgba" or unknown-block(254, 0)

[James Turnbull]

Hi all

Playing with lguest and having what may be a PEBCAK moment but not sure.

Kernel is 2.6.23-rc3 and base.img is a debootstrap'ed sarge disk image.

Am getting the below error - also tried with the xen rootfile suggested
by Rusty's doco - and got the same error.

Any help much appreciated.

# lguest 64m /home/download/linux-2.6.23-rc3/vmlinux --tunnet=10.0.0.90
--block=base.img root=/dev/lgba

Reserving virtual address space above 0xffc00000
Linux version 2.6.23-rc3 (root at debian) (gcc version 4.1.3 20070812
(prerelease) (Debian 4.1.2-15)) #3 SMP Fri Aug 31 01:14:45 EST 2007
BIOS-provided physical RAM map:
 LGUEST: 0000000000000000 - 0000000004000000 (usable)
0MB HIGHMEM available.
64MB LOWMEM available.
Zone PFN ranges:
  DMA             0 ->     4096
  Normal       4096 ->    16384
  HighMem     16384 ->    16384
Movable zone start PFN for each node
early_node_map[1] active PFN ranges
    0:        0 ->    16384
DMI not present or invalid.
Allocating PCI resources starting at 10000000 (gap: 04000000:fc000000)
Built 1 zonelists in Zone order.  Total pages: 16256
Kernel command line: root=/dev/lgba
Local APIC disabled by BIOS -- you can enable it with "lapic"
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
PID hash table entries: 256 (order: 8, 1024 bytes)
Console: colour dummy device 80x25
console [hvc0] enabled
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 60848k/65536k available (2576k kernel code, 4668k reserved, 825k
data, 248k init, 0k highmem)
virtual kernel memory layout:
    fixmap  : 0xffb4c000 - 0xffbff000   ( 716 kB)
    pkmap   : 0xff400000 - 0xff800000   (4096 kB)
    vmalloc : 0xc4800000 - 0xff3fe000   ( 939 MB)
    lowmem  : 0xc0000000 - 0xc4000000   (  64 MB)
      .init : 0xc045b000 - 0xc0499000   ( 248 kB)
      .data : 0xc038426d - 0xc0452744   ( 825 kB)
      .text : 0xc0100000 - 0xc038426d   (2576 kB)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Security Framework v1.0.0 initialized
SELinux:  Disabled at boot.
Capability LSM initialized
Mount-cache hash table entries: 512
CPU: L1 I cache: 16K, L1 D cache: 16K
CPU: L2 cache: 256K
Compat vDSO mapped to ffbfe000.
SMP alternatives: switching to UP code
Freeing SMP alternatives: 16k freed
CPU0: Intel(R) Pentium(R) III CPU             1133MHz stepping 01
SMP motherboard not detected.
Local APIC not detected. Using dummy APIC emulation.
Brought up 1 CPUs
Booting paravirtualized kernel on lguest
NET: Registered protocol family 16
PCI: Fatal: No config space access function found
Setting up standard PCI resources
ACPI: Interpreter disabled.
Linux Plug and Play Support v0.97 (c) Adam Belay
pnp: PnP ACPI: disabled
PnPBIOS: Disabled
PCI: Using ACPI for IRQ routing
PCI: If a device doesn't work, try "pci=routeirq".  If it helps, post a
report
PCI: System does not support PCI
PCI: System does not support PCI
NET: Registered protocol family 8
NET: Registered protocol family 20
NET: Registered protocol family 2
Time: lguest clocksource has been installed.
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 2, 24576 bytes)
TCP bind hash table entries: 2048 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
audit: initializing netlink socket (disabled)
audit(1188489413.220:1): initialized
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
fuse init (API version 7.8)
JFS: nTxBlock = 475, nTxLock = 3805
SGI XFS with ACLs, security attributes, realtime, large block numbers,
no debug enabled
SGI XFS Quota Management subsystem
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
isapnp: Write Data Register 0xa79 already used
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize
lgba: device 1 at major 254
PNP: No PS/2 controller found. Probing ports directly.
i8042.c: No controller found.
mice: PS/2 mouse device common for all mice
lguest is afraid of lguest
TCP bic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
Using IPI No-Shortcut mode
VFS: Cannot open root device "lgba" or unknown-block(254,0)
Please append a correct "root=" boot option; here are the available
partitions:
fe00    1049600 lgba (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(254,0)
lguest: CRASH: VFS: Unable to mount root fs on unknown-block(254,0)

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