grub 2 modules for linux i386

[Dallas Clement]

Can someone please tell me what grub modules are required for a linux
i386 grub 2 install?

I am supplying the following modules to the 'mkimage' command:

fs_module=$(/sbin/grub-probe --target=fs \
          --device-map=${root_part_dir}/boot/grub/device.map \
          ${root_part_dir}/boot/grub)

modules="$fs_module _linux _chain pc"

/bin/grub-mkimage --output=${root_part_dir}/boot/grub/core.img \
                  --directory=${root_part_dir}/boot/grub $modules

I have verified that my fs_module is "ext2".  After installing grub 2 in
this fashion on my target system, Upon reboot I get:

GRUB Loading stage1.5

GRUB loading, please wait...
Error 15

---------

I'm guessing that I'm missing some module(s).  If someone could point
out what I'm doing wrong, I'd appreciate it.

Thanks in advance for any help!