--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2021
+ * Köry Maincent, Bootlin, <kory.maincent@bootlin.com>
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <i2c.h>
+#include <extension_board.h>
+
+#include "cape_detect.h"
+
+static void sanitize_field(char *text, size_t size)
+{
+ char *c = NULL;
+
+ for (c = text; c < text + (int)size; c++) {
+ if (*c == 0xFF)
+ *c = 0;
+ }
+}
+
+int extension_board_scan(struct list_head *extension_list)
+{
+ struct extension *cape;
+ struct am335x_cape_eeprom_id eeprom_header;
+
+ int num_capes = 0;
+ int ret, i;
+ struct udevice *dev;
+ unsigned char addr;
+
+ char process_cape_part_number[17] = {'0'};
+ char process_cape_version[5] = {'0'};
+ uint8_t cursor = 0;
+
+ for (addr = CAPE_EEPROM_FIRST_ADDR; addr <= CAPE_EEPROM_LAST_ADDR; addr++) {
+ ret = i2c_get_chip_for_busnum(CONFIG_CAPE_EEPROM_BUS_NUM, addr, 1, &dev);
+ if (ret)
+ continue;
+
+ /* Move the read cursor to the beginning of the EEPROM */
+ dm_i2c_write(dev, 0, &cursor, 1);
+ ret = dm_i2c_read(dev, 0, (uint8_t *)&eeprom_header,
+ sizeof(struct am335x_cape_eeprom_id));
+ if (ret) {
+ printf("Cannot read i2c EEPROM\n");
+ continue;
+ }
+
+ if (eeprom_header.header != CAPE_MAGIC)
+ continue;
+
+ sanitize_field(eeprom_header.board_name, sizeof(eeprom_header.board_name));
+ sanitize_field(eeprom_header.version, sizeof(eeprom_header.version));
+ sanitize_field(eeprom_header.manufacturer, sizeof(eeprom_header.manufacturer));
+ sanitize_field(eeprom_header.part_number, sizeof(eeprom_header.part_number));
+
+ /* Process cape part_number */
+ memset(process_cape_part_number, 0, sizeof(process_cape_part_number));
+ strncpy(process_cape_part_number, eeprom_header.part_number, 16);
+ /* Some capes end with '.' */
+ for (i = 15; i >= 0; i--) {
+ if (process_cape_part_number[i] == '.')
+ process_cape_part_number[i] = '\0';
+ else
+ break;
+ }
+
+ /* Process cape version */
+ memset(process_cape_version, 0, sizeof(process_cape_version));
+ strncpy(process_cape_version, eeprom_header.version, 4);
+ for (i = 0; i < 4; i++) {
+ if (process_cape_version[i] == 0)
+ process_cape_version[i] = '0';
+ }
+
+ printf("BeagleBone Cape: %s (0x%x)\n", eeprom_header.board_name, addr);
+
+ cape = calloc(1, sizeof(struct extension));
+ if (!cape) {
+ printf("Error in memory allocation\n");
+ return num_capes;
+ }
+
+ snprintf(cape->overlay, sizeof(cape->overlay), "%s-%s.dtbo",
+ process_cape_part_number, process_cape_version);
+ strncpy(cape->name, eeprom_header.board_name, 32);
+ strncpy(cape->version, process_cape_version, 4);
+ strncpy(cape->owner, eeprom_header.manufacturer, 16);
+ list_add_tail(&cape->list, extension_list);
+ num_capes++;
+ }
+ return num_capes;
+}