configs: atmel: add sama5d4 xplained sd card image generation

Use genimage to generate a sd card with a fat partition (at91bootstrap,
u-boot, kernel, dtbs) and an ext4 partition (rootfs).

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

board/atmel/sama5d4_xplained_mmc/genimage.cfg

@@ -0,0 +1,34 @@
+# Image for SD card boot on Atmel SAMA5D4 Xplained boards
+#
+image boot.vfat {
+	vfat {
+		files = {
+			"zImage",
+			"at91-sama5d4_xplained.dtb",
+			"at91-sama5d4_xplained_hdmi.dtb",
+			"at91-sama5d4_xplained_pda4.dtb",
+			"at91-sama5d4_xplained_pda7.dtb",
+			"at91-sama5d4_xplained_pda7b.dtb",
+			"boot.bin",
+			"u-boot.bin"
+		}
+	}
+	size = 16M
+}
+
+image sdcard.img {
+	hdimage {
+	}
+
+	partition boot {
+		partition-type = 0xC
+		bootable = "true"
+		image = "boot.vfat"
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+		size = 512M
+	}
+}

board/atmel/sama5d4_xplained_mmc/post-image.sh

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+#!/bin/sh
+
+BOARD_DIR="$(dirname $0)"
+GENIMAGE_CFG="${BOARD_DIR}/genimage.cfg"
+GENIMAGE_TMP="${BUILD_DIR}/genimage.tmp"
+
+rm -rf "${GENIMAGE_TMP}"
+
+genimage                               \
+	--rootpath "${TARGET_DIR}"     \
+	--tmppath "${GENIMAGE_TMP}"    \
+	--inputpath "${BINARIES_DIR}"  \
+	--outputpath "${BINARIES_DIR}" \
+	--config "${GENIMAGE_CFG}"