BUS_MGR_ID
if (try_bmr && (fc->irm != -1) && (CSRARC(fc, BUS_MGR_ID) == 0x3f)) {
CSRARC(fc, BUS_MGR_ID) = fc->set_bmr(fc, fc->irm);
CSRARC(fc, BUS_MGR_ID) = fc->set_bmr(fc, bmr & 0x3f);
fp->mode.lreq.dest_lo = 0xf0000000 | BUS_MGR_ID;
device_printf(fc->bdev, "bus manager %d ", CSRARC(fc, BUS_MGR_ID));
if(CSRARC(fc, BUS_MGR_ID) != fc->nodeid) {
CSRARC(fc, BUS_MGR_ID) = 0x3f;