mb/prodrive/hermes: Use serial numbers from BMC

The BMC EEPROM layout has been updated to contain system and mainboard
serial numbers. Use these values in SMBIOS Type 1 and Type 2 tables.

Change-Id: I55b51a856b4ad28fd56b02015b2e1d49cd629735
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55275
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/prodrive/hermes/Makefile.inc

@@ -10,6 +10,7 @@ romstage-y += eeprom.c
 ramstage-y += ramstage.c
 ramstage-y += mainboard.c
 ramstage-y += eeprom.c
+ramstage-y += smbios.c
 
 ramstage-$(CONFIG_AZALIA_PLUGIN_SUPPORT) += variants/baseboard/hda_verb.c
 ramstage-$(CONFIG_AZALIA_PLUGIN_SUPPORT) += variants/r04/hda_verb.c

src/mainboard/prodrive/hermes/smbios.c

@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <smbios.h>
+#include <types.h>
+
+#include "variants/baseboard/include/eeprom.h"
+
+const char *smbios_system_serial_number(void)
+{
+	const size_t offset = offsetof(struct eeprom_layout, system_serial_number);
+	static char serial_no[HERMES_SERIAL_NUMBER_LENGTH] = { 0 };
+
+	if (eeprom_read_buffer(serial_no, offset, sizeof(serial_no)) == 0)
+		return serial_no;
+	else
+		return CONFIG_MAINBOARD_SERIAL_NUMBER;
+}
+
+const char *smbios_mainboard_serial_number(void)
+{
+	const size_t offset = offsetof(struct eeprom_layout, board_serial_number);
+	static char serial_no[HERMES_SERIAL_NUMBER_LENGTH] = { 0 };
+
+	if (eeprom_read_buffer(serial_no, offset, sizeof(serial_no)) == 0)
+		return serial_no;
+	else
+		return CONFIG_MAINBOARD_SERIAL_NUMBER;
+}

src/mainboard/prodrive/hermes/variants/baseboard/include/eeprom.h

@@ -62,6 +62,8 @@ struct __packed eeprom_bmc_settings {
 	uint8_t hsi;
 };
 
+#define HERMES_SERIAL_NUMBER_LENGTH	32
+
 /* The EEPROM on address 0x57 has the following vendor defined layout: */
 struct __packed eeprom_layout {
 	union {
@@ -76,7 +78,9 @@ struct __packed eeprom_layout {
 		uint8_t RawBoardLayout[0x400];
 		struct eeprom_board_layout BoardLayout;
 	};
-	uint8_t BootOrder[0x900];
+	char system_serial_number[HERMES_SERIAL_NUMBER_LENGTH];
+	char board_serial_number[HERMES_SERIAL_NUMBER_LENGTH];
+	uint8_t BootOrder[0x8c0];
 	union {
 		uint8_t RawBoardSetting[0xF8];
 		struct eeprom_board_settings BoardSettings;