generate mac address for eth/wlan based on soc serial

arch/mips/lib/board.c

@@ -41,6 +41,11 @@
 #define BOOT_SCRIPT "fatload mmc 0 ${baseaddr} boot.scr"
 #define ENV_FILE "fatload mmc 0 ${baseaddr} uEnv.txt"
 
+#define SERIAL_NUM_ADDR1 0x13540200
+#define SERIAL_NUM_ADDR2 0x13540204
+#define SERIAL_NUM_ADDR3 0x13540208
+#define SERIAL_NUM_ADDR4 0x13540238 // T10/T20/T30
+
 extern int debug_socinfo;
 extern int do_socinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
 
@@ -112,24 +117,64 @@ static int init_baudrate(void)
 }
 
 // Lets move this into another file, along with most of the other env setup gear...
-static void set_random_mac_address(const char *iface_name, const char *iface_type, uint8_t *addr) {
-    // Check if a valid address is already set for the given interface
-    if (!eth_getenv_enetaddr(iface_name, addr)) {
-        // No valid address set, generate and set a new one
-        eth_random_enetaddr(addr);
-        if (eth_setenv_enetaddr(iface_name, addr)) {
-            printf("Net:   Failed to set %s address for %s\n", iface_type, iface_name);
-        } else {
-            printf("Net:   Random MAC address for %s (%s) set successfully\n", iface_type, iface_name);
-            saveenv();
-        }
-    } else {
-        // A valid address is already set, so no need to set it again
-        printf("Net:   HW %s Ethernet address for %s: %02X:%02X:%02X:%02X:%02X:%02X\n",
-               iface_type, iface_name,
-               addr[0], addr[1], addr[2],
-               addr[3], addr[4], addr[5]);
-    }
+
+static void increment_mac_address(uint8_t *mac) {
+	int i; // Declare loop variable outside of the for loop
+	// Increment the last byte of the MAC address
+	// If it rolls over, increment the next byte, and so on
+	for (i = 5; i >= 0; i--) {
+		mac[i]++;
+		if (mac[i] != 0) {
+			break; // No rollover, so stop
+		}
+	}
+}
+
+static void generate_mac_from_serial(uint8_t *mac, uint32_t base1, uint32_t base2, uint32_t base3, uint32_t base4) {
+	// Generate MAC address using parts of the serial number
+	mac[0] = 0x02; // Locally administered and unicast
+	mac[1] = (base4 >> 24) & 0xFF;
+	mac[2] = (base4 >> 16) & 0xFF;
+	mac[3] = (base4 >> 8) & 0xFF;
+	mac[4] = base4 & 0xFF;
+	// Use a combination of serial parts for the last byte
+	mac[5] = ((base1 ^ base2 ^ base3 ^ base4) & 0xFF) | 0x01; // Ensure the last bit is 1 for unicast
+}
+
+static void generate_or_set_mac_address(const char *iface_name, const char *iface_type, bool increment) {
+	uint8_t addr[6];
+	uint32_t serial_part1 = readl(SERIAL_NUM_ADDR1);
+	uint32_t serial_part2 = readl(SERIAL_NUM_ADDR2);
+	uint32_t serial_part3 = readl(SERIAL_NUM_ADDR3);
+	uint32_t serial_part4 = readl(SERIAL_NUM_ADDR4 + 4);
+
+	if (!eth_getenv_enetaddr((char*)iface_name, addr)) {
+		// Check if all serial parts are zero
+		if (serial_part1 == 0 && serial_part2 == 0 && serial_part3 == 0 && serial_part4 == 0) {
+			// Generate a random MAC address
+			eth_random_enetaddr(addr);
+			printf("Net:   Random MAC address for %s generated\n", iface_type);
+		} else {
+			// Generate MAC from serial
+			generate_mac_from_serial(addr, serial_part1, serial_part2, serial_part3, serial_part4);
+			if (increment) {
+				increment_mac_address(addr); // For WLAN, make MAC +1 compared to ETH
+			}
+			printf("Net:   MAC address for %s based on device serial set\n", iface_type);
+		}
+
+		if (eth_setenv_enetaddr((char*)iface_name, addr)) {
+			printf("Net:   Failed to set address for %s\n", iface_type);
+		} else {
+			saveenv();
+		}
+	} else {
+		// A valid MAC address is already set
+		printf("Net:   HW address for %s: %02X:%02X:%02X:%02X:%02X:%02X\n",
+			iface_type,
+			addr[0], addr[1], addr[2],
+			addr[3], addr[4], addr[5]);
+	}
 }
 
 /*
@@ -368,13 +413,10 @@ void board_init_r(gd_t *id, ulong dest_addr)
 
 	/* At this point, Environment has been setup, now we can use it */
 
-	/* Generate a random mac address, and save it as soon as the environment is up*/
 #ifdef CONFIG_RANDOM_MACADDR
-	uint8_t enetaddr[6];
-	uint8_t wlanaddr[6];
-
-	set_random_mac_address("ethaddr", "ETH", enetaddr);
-	set_random_mac_address("wlanmac", "WLAN", wlanaddr);
+	// Generate/set MAC Address
+	generate_or_set_mac_address("ethaddr", "ETH", false);
+	generate_or_set_mac_address("wlanmac", "WLAN", true);
 #endif
 
 #if defined(CONFIG_PCI)