[PATCH v2 2/4] board: am62x: Add support for reading eeprom data

Guillaume La Roque (TI.com)
2025-10-24T14:17:37Z

I2C EEPROM data contains the board name and its revision.
Add support for:
- Reading EEPROM data and store a copy at end of SRAM
- Updating env variable with relevant board info
- Printing board info during boot

Use the generic do_board_detect_am6() and setup_serial_am6()
functions to avoid code duplication across AM6x family boards.

Signed-off-by: Guillaume La Roque (TI.com) <glaroque@baylibre.com>
---
arch/arm/mach-k3/am62x/Kconfig | 3 +++
board/ti/am62x/evm.c | 54 +++++++++++++++++++++++++++++++++++++++++-
configs/am62x_evm_r5_defconfig | 1 +
3 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-k3/am62x/Kconfig b/arch/arm/mach-k3/am62x/Kconfig
index 81199ada3a1..f7ad52db7d8 100644
--- a/arch/arm/mach-k3/am62x/Kconfig
+++ b/arch/arm/mach-k3/am62x/Kconfig
@@ -14,6 +14,8 @@ config TARGET_AM625_A53_EVM
select ARM64
select BINMAN
select OF_SYSTEM_SETUP
+ imply TI_COMMON_CMD_OPTIONS
+ imply TI_I2C_BOARD_DETECT

config TARGET_AM625_R5_EVM
bool "TI K3 based AM625 EVM running on R5"
@@ -25,6 +27,7 @@ config TARGET_AM625_R5_EVM
select K3_DDRSS
select BINMAN
imply SYS_K3_SPL_ATF
+ imply TI_I2C_BOARD_DETECT

config TARGET_PHYCORE_AM62X_A53
bool "PHYTEC phyCORE-AM62x running on A53"
diff --git a/board/ti/am62x/evm.c b/board/ti/am62x/evm.c
index c2c7a0216b9..591324ecc15 100644
--- a/board/ti/am62x/evm.c
+++ b/board/ti/am62x/evm.c
@@ -22,8 +22,16 @@
#include <dm/uclass.h>
#include <asm/arch/k3-ddr.h>

+#include "../common/board_detect.h"
#include "../common/fdt_ops.h"

+#define board_is_am62x_skevm() (board_ti_k3_is("AM62-SKEVM") || \
+ board_ti_k3_is("AM62B-SKEVM"))
+#define board_is_am62b_p1_skevm() board_ti_k3_is("AM62B-SKEVM-P1")
+#define board_is_am62x_lp_skevm() board_ti_k3_is("AM62-LP-SKEVM")
+#define board_is_am62x_sip_skevm() board_ti_k3_is("AM62SIP-SKEVM")
+#define board_is_am62x_play() board_ti_k3_is("BEAGLEPLAY-A0-")
+
DECLARE_GLOBAL_DATA_PTR;

#if CONFIG_IS_ENABLED(SPLASH_SCREEN)
@@ -74,9 +82,53 @@ struct efi_capsule_update_info update_info = {
.images = fw_images,
};

-#ifdef CONFIG_BOARD_LATE_INIT
+#if CONFIG_IS_ENABLED(TI_I2C_BOARD_DETECT)
+int checkboard(void)
+{
+ struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
+
+ if (!do_board_detect_am6())
+ printf("Board: %s rev %s\n", ep->name, ep->version);
+
+ return 0;
+}
+
+#if CONFIG_IS_ENABLED(BOARD_LATE_INIT)
+static void setup_board_eeprom_env(void)
+{
+ char *name = "am62x_skevm";
+
+ if (do_board_detect_am6())
+ goto invalid_eeprom;
+
+ if (board_is_am62x_skevm())
+ name = "am62x_skevm";
+ else if (board_is_am62b_p1_skevm())
+ name = "am62b_p1_skevm";
+ else if (board_is_am62x_lp_skevm())
+ name = "am62x_lp_skevm";
+ else if (board_is_am62x_sip_skevm())
+ name = "am62x_sip_skevm";
+ else if (board_is_am62x_play())
+ name = "am62x_beagleplay";
+ else
+ printf("Unidentified board claims %s in eeprom header\n",
+ board_ti_get_name());
+
+invalid_eeprom:
+ set_board_info_env_am6(name);
+}
+#endif
+#endif
+
+#if CONFIG_IS_ENABLED(BOARD_LATE_INIT)
int board_late_init(void)
{
+ if (IS_ENABLED(CONFIG_TI_I2C_BOARD_DETECT)) {
+ setup_board_eeprom_env();
+ setup_serial_am6();
+ }
+
ti_set_fdt_env(NULL, NULL);
return 0;
}
diff --git a/configs/am62x_evm_r5_defconfig b/configs/am62x_evm_r5_defconfig
index 18ffc991b25..d42bdf1f074 100644
--- a/configs/am62x_evm_r5_defconfig
+++ b/configs/am62x_evm_r5_defconfig
@@ -85,6 +85,7 @@ CONFIG_SPL_CLK_K3_PLL=y
CONFIG_SPL_CLK_K3=y
CONFIG_TI_SCI_PROTOCOL=y
CONFIG_DA8XX_GPIO=y
+CONFIG_DM_I2C=y
CONFIG_DM_MAILBOX=y
CONFIG_K3_SEC_PROXY=y
CONFIG_SPL_MISC=y

--
2.34.1