VR_BCR1          1422 dev/pci/if_vr.c 	VR_CLRBIT(sc, VR_BCR1, VR_BCR1_TX_THRESH);
VR_BCR1          1423 dev/pci/if_vr.c 	VR_SETBIT(sc, VR_BCR1, VR_BCR1_TXTHRESHSTORENFWD);