Trouble running Custom kernel

[shivanth m p]

I compiled a custom kernel on a virtual box and wen i try to boot the kernel
, It says "udev:Wating for device /dev/sda1"and then after 10 seconds it
drops to ramfs shell .
I think this is a configuration mistake .
 I tried to make the kernel with the distro specific .config file from
/proc/config.gz , But it still doesn't respond .

Anybody had this problem before ?  May be you guys could help me out .
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