Physical memory handling changes

Paul Kranenburg has updated the code that manages physical memory in NetBSD/sparc (see the NetBSD-current versions of pmap.c, machdep.c, and autoconf.c), resulting in these "user visible" changes:

The kernels message buffer size is now 8192 (was 4096) on all platforms under NetBSD/sparc. sun4 users: The full first page is now used, since there should be sufficient sanity checking in the message buffer initialization code to detect possible corruption by boot programs. Testing on a sun 4/490 showed no problems.

sun4m PROMs may allow you to not have a memory bank starting at physical address 0. The NetBSD bootstrap code now also deals with this, so you can plug your memory modules into any slot supported by the machine's PROM.

If you encounter any problems, please drop Paul a note.

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