toradex: common: unify behaviour when config block is missing

If the config block is missing, various things may fail or behave
strangely on certain modules. This patch unifies that behaviour by
using a fake MAC address, until user updates the config block.
Signed-off-by: NBhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Acked-by: NMarcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: NIgor Opaniuk <igor.opaniuk@toradex.com>

board/toradex/common/tdx-common.c

@@ -12,6 +12,8 @@
 #include <asm/setup.h>
 #include "tdx-common.h"
 
+#define TORADEX_OUI 0x00142dUL
+
 #ifdef CONFIG_TDX_CFG_BLOCK
 static char tdx_serial_str[9];
 static char tdx_board_rev_str[6];
@@ -68,20 +70,25 @@ int show_board_info(void)
 	unsigned char ethaddr[6];
 
 	if (read_tdx_cfg_block()) {
-		printf("Missing Toradex config block\n");
+		printf("MISSING TORADEX CONFIG BLOCK\n");
+		tdx_eth_addr.oui = htonl(TORADEX_OUI << 8);
+		tdx_eth_addr.nic = htonl(tdx_serial << 8);
 		checkboard();
-		return 0;
+	} else {
+		sprintf(tdx_serial_str, "%08u", tdx_serial);
+		sprintf(tdx_board_rev_str, "V%1d.%1d%c",
+			tdx_hw_tag.ver_major,
+			tdx_hw_tag.ver_minor,
+			(char)tdx_hw_tag.ver_assembly + 'A');
+
+		env_set("serial#", tdx_serial_str);
+
+		printf("Model: Toradex %s %s, Serial# %s\n",
+		       toradex_modules[tdx_hw_tag.prodid],
+		       tdx_board_rev_str,
+		       tdx_serial_str);
 	}
 
-	/* board serial-number */
-	sprintf(tdx_serial_str, "%08u", tdx_serial);
-	sprintf(tdx_board_rev_str, "V%1d.%1d%c",
-		tdx_hw_tag.ver_major,
-		tdx_hw_tag.ver_minor,
-		(char)tdx_hw_tag.ver_assembly + 'A');
-
-	env_set("serial#", tdx_serial_str);
-
 	/*
 	 * Check if environment contains a valid MAC address,
 	 * set the one from config block if not
@@ -101,11 +108,6 @@ int show_board_info(void)
 	}
 #endif
 
-	printf("Model: Toradex %s %s, Serial# %s\n",
-	       toradex_modules[tdx_hw_tag.prodid],
-	       tdx_board_rev_str,
-	       tdx_serial_str);
-
 	return 0;
 }