FW_NO_BUS_MANAGER
if (try_bmr && (fc->irm != -1) && (CSRARC(fc, BUS_MGR_ID) == FW_NO_BUS_MANAGER)) {
CSRARC(fc, BUS_MGR_ID) = FW_NO_BUS_MANAGER;
if ((bm & FW_NODE_MASK) == FW_NO_BUS_MANAGER)