DSTCACHE_CTLSTAT
OUTREG(DSTCACHE_CTLSTAT, RB2D_DC_FLUSH_ALL);
OUTREG(DSTCACHE_CTLSTAT, RB2D_DC_FLUSH_ALL);
OUTREGP(DSTCACHE_CTLSTAT, RB2D_DC_FLUSH_ALL,
if (!(INREG(DSTCACHE_CTLSTAT) & RB2D_DC_BUSY))