RB2D_DSTCACHE_MODE
tmp = INREG(RB2D_DSTCACHE_MODE);
OUTREG(RB2D_DSTCACHE_MODE, tmp | (1 << 17)); /* FIXME */
OUTREG(RB2D_DSTCACHE_MODE, INREG(RB2D_DSTCACHE_MODE) |
OUTREG(RB2D_DSTCACHE_MODE, 0);