LOOPBK            227 drivers/net/ethernet/microchip/encx24j600_hw.h #define LOOPBK (1 << 4)
LOOPBK            213 drivers/net/ethernet/sis/sis900.h 	FAERR   = 0x00040000, LOOPBK   = 0x00020000, RXCOL   = 0x00010000