No modules are loaded during grub2 network boot on ppc64.

After fetching grub2 from the network, the grub menu is presented. If I go to the grub console and try to fire a few commands I get following output:

grub> echo 'foo'
error: can't find command `echo'.
grub> help
error: can't find command `help'.
grub> 

The same behavior happens if I choose one of the grub menu entries. It fails to boot because there is no 'linux' command.

It can be workaround adding a few insmod's to the grub config file, like:
insmod echo
insmod linux
...

This is the command line I used to generate grub's elf and modules directory:

grub-mknetdir --net-directory=/tftpboot --subdir=gustavold

== 

This is a revision of Matthew Garrett's patch 
grub-2.00-add-fw_path-search.patch. This should fix the "no modules 
loaded" issue.

Matthew's patch looks for the grub.cfg file in the bootlocation. In case 
the file is not found, it continues the normal path, which is to look 
for the grub.cfg using the prefix.

The issue comes from the fact that the original patch does not clear the 
grub_errno in case the grub.cfg is not found in the bootlocation. This 
leads to a fake error later when grub tries to open the file "command.lst".