Unable to mount /dev/root

[Igor V. Ruzanov]

>> # CONFIG_HOTPLUG is not set
>
> You need CONFIG_HOTPLUG for udev to work correctly, without this option
> you may not get the device-nodes even if you compiled the right drivers
> in your kernel.
>
Thanks for your hint! I set CONFIG_HOTPLUG to 'y'. Also i added some 
derivative options:

CONFIG_HOTPLUG_PCI=y
CONFIG_HOTPLUG_PCI_FAKE=m
CONFIG_HOTPLUG_PCI_CPCI=y
# CONFIG_HOTPLUG_PCI_CPCI_ZT5550 is not set
# CONFIG_HOTPLUG_PCI_CPCI_GENERIC is not set
CONFIG_HOTPLUG_PCI_SHPC=m

With them some error messages were disapperred from boot log but the 
system persists to be dropped into panic after rest of messages:

mount: could not find filesystem /dev/root
[...]
switchroot: mount failed: No such file or directory
Kernel panic - not syncing: No such file or directory


For little debug i unpacked my initrd image and modified 'init' script 
with several changes:

mount -o defaults --ro -t ext3 sda1 /sysroot
showlabels
sleep 5

where mount command was given in obvious way with telling of root device 
(in my case its a /dev/sda1 which also i point it in l4linux26.cfg) and 
showtables to show what are devices/partitions and their labels are 
exactly seen by nash. Noone of sd{a|b} devices was listed during of 
next boot log.

my l4linux26.cfg looks like:
sleep 1
task "vmlinuz-2.6.24-l4" "earlyprintk=yes mem=512M ro root=/dev/sda1 l4env_rd=initrd-2.6.24-l4.img"
all_sects_writable
allow_vga

i even tried to change root=/dev/sda1 with root=LABEL=/ as labeled my 
/dev/sda1 partition.


I suppose that my mistake could be in absence some kernel options that 
might be very specific for my hardware configuration:

CPU: Pentium Dual Core, 2GHz
RAM: 2048 Mb
Chipset: Intel G33 Express
HDD: SATA, 250Gb

or there is hypothetical way to 'dig' the problem from some another side ;)