wotcher,

I've just upgraded my kernel to 2.4.21 & patched for the new APCI (power management) functionality. The kernel upgrade & patch went without a hitch. I've added a grub file entry as follows:

title Red Hat Linux [ACPI Enabled] (2.4.21)
root (hd0,2)
kernel /boot/vmlinuz-2.4.21 ro root=LABEL=/
initrd /boot/initrd-2.4.21.img

Basically this is identical to all previous grub entries barring the kernel version number.

However when I try and boot with the new kernel, while everything starts ok, before long I get a kernel panic with the following error:

VFS: cannot open root device "LABEL=/" or 00:00
Please append a correct "root = " boot option

and blam! over she goes...

Any ideas here - it seems like a simple syntax error in the grub file but as I said the entry is identical to all previous entries.

The only other thing that's different is I don't have a module-info file in /boot/ for the new kernel. I'm told this doesn't matter however.

Any leads/directions before I start suspecting the APCI modules are at fault?

Cormac

if your root is mounted on "hda3" then your settings are correct. otherwise just use (hd0,root-partition-number-1).

in case if you are doing correctyly then try this

title Red Hat Linux [ACPI Enabled] (2.4.21)
root (hd0,2)
kernel (hd0,2)/boot/vmlinuz-2.4.21 ro root=LABEL=/
initrd (hd0,2)/boot/initrd-2.4.21.img

OR

title Red Hat Linux [ACPI Enabled] (2.4.21)
root (hd0,2)
kernel /boot/vmlinuz-2.4.21 ro root=LABEL=/ hdd=ide-scsi
initrd /boot/initrd-2.4.21.img

i was wrong above...but the most accurate answer is given below

instead of root=LABEL=/
do root=/dev/hdax (where x is the root partition number)

that should fix your problem