xINTSR
CSR_WRITE(sc, xINTSR, IRQ_UCODE); /* pre-cautional W1C */
error = WAIT_FOR_SET(sc, xINTSR, IRQ_UCODE);
CSR_WRITE(sc, xINTSR, IRQ_UCODE); /* W1C load complete report */
status = CSR_READ(sc, xINTSR); /* not W1C */