From: Anton Blanchard <anton@samba.org>

This is a port of the nvram buffering/error logging code from 2.4 to 2.6.  It
includes moving /proc/rtas to /proc/ppc64/rtas and making /proc/rtas a
symlink to /proc/ppc64/rtas.  It also splits up the /dev/nvram device
read/write functions from the basic nvram access functions, and adds ppc_md
fields for the nvram access functions.