configs: dragonboard410c: Save environment data on eMMC

Save the environment data at the end of the boot partition on emmc
Signed-off-by: NJorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>

arch/arm/dts/dragonboard410c-uboot.dtsi

@@ -6,6 +6,13 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
+/ {
+	config {
+		u-boot,mmc-env-partition = "boot";
+	};
+};
+
+
 &pm8916_gpios {
 	usb_hub_reset_pm {
 		gpios = <&pm8916_gpios 2 0>;

configs/dragonboard410c_defconfig

@@ -43,3 +43,5 @@ CONFIG_USB_ETHER_ASIX88179=y
 CONFIG_USB_ETHER_MCS7830=y
 CONFIG_USB_ETHER_SMSC95XX=y
 CONFIG_OF_LIBFDT_OVERLAY=y
+CONFIG_OF_CONTROL=y
+CONFIG_ENV_IS_IN_MMC=y

include/configs/dragonboard410c.h

@@ -100,6 +100,7 @@ REFLASH(dragonboard/u-boot.img, 8)\
 	BOOTENV
 
 #define CONFIG_ENV_SIZE			0x2000
+#define CONFIG_SYS_MMC_ENV_DEV		0	/* mmc0 = emmc, mmc1 = sd */
 #define CONFIG_ENV_VARS_UBOOT_CONFIG
 
 /* Size of malloc() pool */