ARM: imx: cm_fx6: export board and soc info to env

Like many other i.MX6 based boards, there are multiple variants of
the cm-fx6 module featuring different SoC variants. Furthermore, the
module can be paired with multiple baseboards.

At the same time modern distribution like Fedora require U-Boot to
select a proper devicetree which depends on the SoC variant and the
baseboard.

Thus, export the SoC variant and the actual board to the environment
following the conventions of other i.MX6 devices (e.g. the NXP boards)
such that the environment can select a devicetree file to load.

For now, we only know for sure that the cm-fx6 module and the SB-fx6m
baseboard amount to a Utilite Computer variant (depending on the SoC).
Further combinations may be added in the future; e.g. CompuLab's
evaluation board once someone can verify the identification string
stored in its eeprom.

Signed-off-by: Christopher Spinrath <christopher.spinrath@rwth-aachen.de>
Reviewed-by: Stefano Babic <sbabic@denx.de>

arch/arm/mach-imx/mx6/Kconfig

@@ -130,6 +130,7 @@ config TARGET_CM_FX6
 	bool "CM-FX6"
 	select SUPPORT_SPL
 	select MX6QDL
+	select BOARD_LATE_INIT
 	select DM
 	select DM_SERIAL
 	select DM_GPIO

board/compulab/cm_fx6/cm_fx6.c

@@ -621,6 +621,27 @@ int board_init(void)
 	return 0;
 }
 
+int board_late_init(void)
+{
+#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
+	char baseboard_name[16];
+	int err;
+
+	if (is_mx6dq())
+		env_set("board_rev", "MX6Q");
+	else if (is_mx6dl())
+		env_set("board_rev", "MX6DL");
+
+	err = cl_eeprom_get_product_name((uchar *)baseboard_name, 0);
+	if (err)
+		return 0;
+
+	if (!strncmp("SB-FX6m", baseboard_name, 7))
+		env_set("board_name", "Utilite");
+#endif
+	return 0;
+}
+
 int checkboard(void)
 {
 	puts("Board: CM-FX6\n");

include/configs/cm_fx6.h

@@ -67,6 +67,7 @@
 #define CONFIG_ENV_OFFSET		(768 * 1024)
 
 #ifndef CONFIG_SPL_BUILD
+#define CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"fdt_high=0xffffffff\0" \
 	"initrd_high=0xffffffff\0" \