XL_CMD_INTR_ENB
CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_INTR_ENB|XL_INTRS);
CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_INTR_ENB);
CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_INTR_ENB|0);