Compaq TRU64 AA-RNG2A-TE - Manual (Page 109)

else {
lan_set_attribute(sc->ehm.current_val, NET_PROMISC_NDX, (void *)0);
}
WRITE_CMD(sc, CMD_FILTER+i); 7
1 If loopback mode is requested, enables it.
2 Sets the LAN loopback attribute for EHM support.
3 Selects to receive frames that are sent to both the local address and the
broadcast address.
4 If the network device receives all multicast packets, selects all group
addresses.
5 If the network device receives all packets destined to all stations, selects
promiscuous mode.
6 Sets the LAN promiscuous mode attribute for EHM support.
7 Calls the WRITE_CMD macro to write data to the command port register.
In this call, the data to be written is the set receive (RX) filter command
(CMD_FILTER) with the appropriate flags set.
8.2.11 Setting the Debug Flag
The following code shows how the el_init_locked( ) routine sets the
debug flag for turning on debugging on a running system. This task is
optional.
if (ifp->if_flags & IFF_DEBUG) 1
sc->debug++;
else
sc->debug = 0;
if (sc->debug) { 2
WRITE_CMD(sc, CMD_WINDOW3);
i = READ_TXF(sc);
printf("el%d: Transmit FIFO size == %d\n", unit, i);
i = READ_RXF(sc);
WRITE_CMD(sc, CMD_WINDOW1);
printf("el%d: Receive FIFO size == %d\n", unit, i);
}
1 Sets debug mode if the IFF_DEBUG bit is set.
2 If debugging mode is set, prints the transmit and receive first-in/first-out
(FIFO) sizes.
8.2.12 Enabling TX and RX
The following code shows how the el_init_locked( ) routine enables
transmit (TX) and receive (RX). Make sure that you perform similar
initialization tasks for the hardware device that your network driver
controls.
Implementing the Initialization Section 8–9