rev 1.29 of pmap.c causes me to die....mmu fault...I can't track
it down at the moment (other commitments)- 1.28 seems to work.

fyi

(dies in pmap_protect-

fffffc00004f71b0


    trap entry = 0x2 (memory management fault)
    a0         = 0x50
    a1         = 0x1
    a2         = 0x0
    pc         = 0xfffffc00004f7274
    ra         = 0xfffffc00004f726c
    curproc    = 0xfffffe00005b1200
        pid = 1, comm = swapper