Autobooting 3/180 from sd0 rather than xy0

[Ittai Hershman]

Thanks to the many respondents.  I obviously didn't look carefully
enough at the manuals...			-Ittai

Alex Dupuy was the first, so here is the solution in his words:

You want to update the eeprom for your system.  Since the XY has higher
priority than the SD in the normal sequence, you have to specify an
explicit default boot device.  The command needed to do that is:

        eeprom "default_boot=true" "bootdev=sd(0,0,0)"

You need to be superuser (or have write access to /dev/eeprom) to do this.