DCRN_L2C0_CFG
r = mfdcr(dcrbase_l2c + DCRN_L2C0_CFG) &
mtdcr(dcrbase_l2c + DCRN_L2C0_CFG, r);
r = mfdcr(dcrbase_l2c + DCRN_L2C0_CFG);