Index: linux-2.6.21.7/drivers/net/smc91x.c
===================================================================
--- linux-2.6.21.7.orig/drivers/net/smc91x.c
+++ linux-2.6.21.7/drivers/net/smc91x.c
@@ -1815,6 +1815,39 @@ static int __init smc_findirq(void __iom
 	return probe_irq_off(cookie);
 }
 
+static inline unsigned int is_gumstix_oui(u8 *addr)
+{
+	return (addr[0] == 0x00 && addr[1] == 0x15 && addr[2] == 0xC9);
+}
+
+/**
+ * gen_serial_ether_addr - Generate software assigned Ethernet address
+ * based on the system_serial number
+ * @addr: Pointer to a six-byte array containing the Ethernet address
+ *
+ * Generate an Ethernet address (MAC) that is not multicast
+ * and has the local assigned bit set, keyed on the system_serial
+ */
+static inline void gen_serial_ether_addr(u8 *addr)
+{
+	static u8 ether_serial_digit = 0;
+	addr [0] = system_serial_high >> 8;
+	addr [1] = system_serial_high;
+	addr [2] = system_serial_low >> 24;
+	addr [3] = system_serial_low >> 16;
+	addr [4] = system_serial_low >> 8;
+	addr [5] = (system_serial_low & 0xc0) |	/* top bits are from system serial */
+		(1 << 4) |			/* 2 bits identify interface type 1=ether, 2=usb, 3&4 undef */
+		((ether_serial_digit++) & 0x0f);	/* 15 possible interfaces of each type */
+
+	if(!is_gumstix_oui(addr))
+	{
+		addr [0] &= 0xfe;		/* clear multicast bit */
+		addr [0] |= 0x02;		/* set local assignment bit (IEEE802) */
+	}
+}
+
+
 /*
  * Function: smc_probe(unsigned long ioaddr)
  *
@@ -2032,15 +2065,13 @@ static int __init smc_probe(struct net_d
 			THROTTLE_TX_PKTS ? " [throttle_tx]" : "");
 
 		if (!is_valid_ether_addr(dev->dev_addr)) {
-			printk("%s: Invalid ethernet MAC address.  Please "
-			       "set using ifconfig\n", dev->name);
-		} else {
+			gen_serial_ether_addr(dev->dev_addr);
+		}
 			/* Print the Ethernet address */
 			printk("%s: Ethernet addr: ", dev->name);
 			for (i = 0; i < 5; i++)
 				printk("%2.2x:", dev->dev_addr[i]);
 			printk("%2.2x\n", dev->dev_addr[5]);
-		}
 
 		if (lp->phy_type == 0) {
 			PRINTK("%s: No PHY found\n", dev->name);
