Kernel panic on compile of installed sources of 8.1

Hi a.I just tried to compile the complete Suse 8.1 kernel after going through the layers of questions ( is there no file which contains the details of these flags) after adding a bigphysarea patch to the kernel. Did a build .. installed the new kernel At Boot I get the following error: Kernel Panic: -- VFS: Unable to mount root FS 08:33 Please help.. Vishal