[c-nsp] SXI4a or SXI5

[Randy McAnally]

> > 2. Any gotcha's when going from SXF ->  SXI?
> 
> Can you be more specific?

I'm thinking boot code (getting stuck in rommon for some weird reason) and
config format changes -- for example, I don't want to be caught with my pants
down with half my SVI's missing after the reboot, ect.

Some other info:

*  Currently booting SXF from disk0 (1Gb Sandisk) on both Sups.
*  Using only 67xx Ethernet linecards

-Randy