than bootp and rarp.
The code which splits a serverip:/rootpath string into rootip and a plain
pathname is now a separate net_parse_rootpath() function that can be
called by others. The code that sets the kernel env vars needed for
nfs_diskless is moved into net_open() so that the variables get set no
matter where the params came from.
There was already code in net_open() that allowed for the possibility that
some other entity has set up the network-related global variables. It uses
the rootip variable as the key, assuming that if it is set all the other
required variables are set too. These changes don't alter the existing
behavior, they just make it easier to actually write some new code to get
the params from another source (such as the U-Boot environment).
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