B44_DMARX_STAT
if (br32(bp, B44_DMARX_STAT) & DMARX_STAT_EMASK) {
b44_wait_bit(bp, B44_DMARX_STAT, DMARX_STAT_SIDLE,
prod = br32(bp, B44_DMARX_STAT) & DMARX_STAT_CDMASK;