Kernel boot problem?

[Grant <orblists@orbysrealm.com>]

Hey,

I kinda have a problem,

I have compiled now 4 kernel's and the first two kernel's got stuck on 
this message at boot.
<snip>
VFS: Cannot open root device "hda1" or unknown-block(3,1)
Please append a correct "root=" boot option
Kernel panic: VFS: Unable to mount root fs on unknown-block(0,0)
<end snip>

The other two kernels i did get stuck on this.
<snip>
VFS: Cannot open root device "hda1" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic: VFS: Unable to mount root fs on unknown-block(0,0)
<end snip>

The only difference in the two messages is the "unknown-block" section.

I used the old .config file so i would have what i needed for the new 
kernel and all i added was select a few sound card things.

Have i added something that i shouldnt have ? or something i have missed ?

I have checked the root= line in the grub config and it reads the same 
as the current kernel which is 2.6.7-1 and the one i am trying to 
compile is 2.6.8

Thanks in advance :)
Grant.