I know this may be wrong place. But there is no place for crux in this linux forum.
And I believe that people in this forum are smart in compiling kernel.
that's why I post here...

on my Desktop which is with Core2Duo, 1GB ram and running Debian,
I installed crux-2.8 in VirtualBox, compiled kernel without any configuration
because I thought that kernel itself has made default or standard configuration.

After installation process, I reboot VM but I can't boot into newly installed crux.
the message I get is here:

so, i think, it is kernel compilation issue.
pls, anyone guide me!

set the crux virtual box machine to boot from cd or iso or whatever you used to install crux. mount the filesystem within the virtual machine and edit your /etc/lilo.conf so that you can boot your original version of the kernel. if your boot menu shows the old kernel already, then boot with that. get a copy of the .config from your running debian kernel in the crux kernel source directory, and run "make oldconfig" with it there. that should give you a working configuration.

ok, it works, thank you!

Just for the record, the kernel has little defaults. You truly need to configure it yourself. That, or just enable everything and make a huge ramdisk with every driver under the sun.

The errors like the one you saw above are generally due to not having included the chipset driver and/or the fs driver for your root file system. Those are needed either statically into your kernel or in the ramdisk, so the kernel can reach the rest of the drivers that live inside the fs, inside the disk.