r18
uint32 r18;
uint32 r18;
uint8_t r17, r18, r19, r20;
mtw_rf_write(sc, 0, 18, mt7601_rf_chan[i].r18);
frame->r16, frame->r17, frame->r18, frame->r19);
dprintf("r16-r19: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->r16, frame->r17, frame->r18, frame->r19);