[PATCH v2 1/4] board: ti: common: Add generic AM6x board detection functions

Guillaume La Roque (TI.com)
2025-10-24T14:17:28Z

Add two new generic functions for AM6x family boards to simplify
board-specific implementations:

- do_board_detect_am6(): Generic board detection function that reads
the on-board EEPROM. It first attempts to read at the configured
address, and if that fails, tries the alternate address
(CONFIG_EEPROM_CHIP_ADDRESS + 1). This provides a common
implementation that can be used across different AM6x boards.

- setup_serial_am6(): Sets up the serial number environment variable
from the EEPROM data. The serial number is converted from
hexadecimal string format to a 16-character hexadecimal
representation and stored in the "serial#" environment variable.

Both functions are protected by CONFIG_IS_ENABLED(TI_I2C_BOARD_DETECT)
and are designed to be used by AM62x, AM64x, AM65x, and other AM6x
family boards.

Signed-off-by: Guillaume La Roque (TI.com) <glaroque@baylibre.com>
---
board/ti/common/board_detect.c | 43 ++++++++++++++++++++++++++++++++++++++++++
board/ti/common/board_detect.h | 22 +++++++++++++++++++++
2 files changed, 65 insertions(+)

diff --git a/board/ti/common/board_detect.c b/board/ti/common/board_detect.c
index a43cc075b92..d49e26fa453 100644
--- a/board/ti/common/board_detect.c
+++ b/board/ti/common/board_detect.c
@@ -824,3 +824,46 @@ bool __maybe_unused board_ti_was_eeprom_read(void)
else
return false;
}
+
+#if CONFIG_IS_ENABLED(TI_I2C_BOARD_DETECT)
+int do_board_detect_am6(void)
+{
+ int ret;
+
+ ret = ti_i2c_eeprom_am6_get_base(CONFIG_EEPROM_BUS_ADDRESS,
+ CONFIG_EEPROM_CHIP_ADDRESS);
+ if (ret) {
+ printf("EEPROM not available at 0x%02x, trying to read at 0x%02x\n",
+ CONFIG_EEPROM_CHIP_ADDRESS,
+ CONFIG_EEPROM_CHIP_ADDRESS + 1);
+ ret = ti_i2c_eeprom_am6_get_base(CONFIG_EEPROM_BUS_ADDRESS,
+ CONFIG_EEPROM_CHIP_ADDRESS +
+ 1);
+ if (ret)
+ pr_err("Reading on-board EEPROM at 0x%02x failed %d\n",
+ CONFIG_EEPROM_CHIP_ADDRESS + 1, ret);
+ }
+
+ return ret;
+}
+
+void setup_serial_am6(void)
+{
+ struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
+ unsigned long board_serial;
+ char *endp;
+ char serial_string[17] = { 0 };
+
+ if (env_get("serial#"))
+ return;
+
+ board_serial = simple_strtoul(ep->serial, &endp, 16);
+ if (*endp != '\0') {
+ pr_err("Error: Can't set serial# to %s\n", ep->serial);
+ return;
+ }
+
+ snprintf(serial_string, sizeof(serial_string), "%016lx", board_serial);
+ env_set("serial#", serial_string);
+}
+#endif
diff --git a/board/ti/common/board_detect.h b/board/ti/common/board_detect.h
index b057f3b2269..26ada2a449c 100644
--- a/board/ti/common/board_detect.h
+++ b/board/ti/common/board_detect.h
@@ -313,6 +313,28 @@ int __maybe_unused ti_i2c_eeprom_am6_get(int bus_addr, int dev_addr,
*/
int __maybe_unused ti_i2c_eeprom_am6_get_base(int bus_addr, int dev_addr);

+/**
+ * do_board_detect_am6() - Detect AM6x board and read EEPROM data
+ *
+ * This is a generic board detection function for AM6x family boards.
+ * It attempts to read the on-board EEPROM at the configured address,
+ * and if that fails, tries the alternate address (CONFIG_EEPROM_CHIP_ADDRESS + 1).
+ *
+ * Return: 0 on success or corresponding error on failure.
+ */
+int do_board_detect_am6(void);
+
+/**
+ * setup_serial_am6() - Setup serial number environment variable for AM6x boards
+ *
+ * This function reads the serial number from the AM6x EEPROM data and
+ * sets the "serial#" environment variable. The serial number is converted
+ * from hexadecimal string format to a 16-character hexadecimal representation.
+ *
+ * EEPROM should be already read before calling this function.
+ */
+void setup_serial_am6(void);
+
#ifdef CONFIG_TI_I2C_BOARD_DETECT
/**
* board_ti_is() - Board detection logic for TI EVMs

--
2.34.1