The bootblock code in <arch/sparc/stand> now handles version 0 (Sparcstation 1,
IPC) PROMS. It also has some support for version 3 (Sparcstation 5).

It appears many fields in a version 3 PROMS 'struct promvec' are no longer
usable; pv_printf() and pv_putchar() are among these. This is most
inconvenient. Also, L1-A is not recognised while waiting for characters to
appear on the prom's stdin. I have no docs on this latest prom...

The bootblocks should be installed with `installboot' (also in <sparc/stand>).

Be careful.

-pk

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