CPDMA_TX_RLIM
[CPDMA_TX_RLIM] = {CPDMA_DMACONTROL, 8, 0xffff, ACCESS_RW},
rmask = _cpdma_control_get(ctlr, CPDMA_TX_RLIM);
ret = _cpdma_control_set(ctlr, CPDMA_TX_RLIM, rmask);
_cpdma_control_set(ctlr, CPDMA_TX_RLIM, rmask);