Add ability to take MAC address from the environment to DM9000 driver

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Ben Warren <bwarren@qstreams.com>

drivers/dm9000x.c

@@ -302,6 +302,21 @@ eth_init(bd_t * bd)
 	/* Set Node address */
 	for (i = 0; i < 6; i++)
 		((u16 *) bd->bi_enetaddr)[i] = read_srom_word(i);
+
+	if (!is_zero_ether_addr(bd->bi_enetaddr) &&
+	    !is_mutlicast_ether_addr(bd->bi_enetaddr)) {
+		/* try reading from environment */
+		u8 i;
+		char *s, *e;
+		s = getenv ("ethaddr");
+		for (i = 0; i < 6; ++i) {
+			bd->bi_enetaddr[i] = s ?
+				simple_strtoul (s, &e, 16) : 0;
+			if (s)
+				s = (*e) ? e + 1 : e;
+		}
+	}
+
 	printf("MAC: %02x:%02x:%02x:%02x:%02x:%02x\n", bd->bi_enetaddr[0],
 	       bd->bi_enetaddr[1], bd->bi_enetaddr[2], bd->bi_enetaddr[3],
 	       bd->bi_enetaddr[4], bd->bi_enetaddr[5]);

include/net.h

@@ -435,6 +435,29 @@ static inline void NetCopyLong(ulong *to, ulong *from)
 	memcpy((void*)to, (void*)from, sizeof(ulong));
 }
 
+/**
+ * is_zero_ether_addr - Determine if give Ethernet address is all zeros.
+ * @addr: Pointer to a six-byte array containing the Ethernet address
+ *
+ * Return true if the address is all zeroes.
+ */
+static inline int is_zero_ether_addr(const u8 *addr)
+{
+	return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
+}
+
+/**
+ * is_multicast_ether_addr - Determine if the Ethernet address is a multicast.
+ * @addr: Pointer to a six-byte array containing the Ethernet address
+ *
+ * Return true if the address is a multicast address.
+ * By definition the broadcast address is also a multicast address.
+ */
+static inline int is_multicast_ether_addr(const u8 *addr)
+{
+	return (0x01 & addr[0]);
+}
+
 /* Convert an IP address to a string */
 extern void	ip_to_string (IPaddr_t x, char *s);