configs: at91sam9x5ek: new additional defconfigs

This commit:

 - Adds a development rootfs defconfig for the at91sam9x5ek board for
   NAND-based configurations.

 - Adds SD-card based configurations for the at91sam9x5ek board, both a
   minimal one and development one.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
[Thomas: add at91sam9x5ek_mmc_defconfig to have all four combinations:
NAND minimal, NAND development, SD minimal, SD development.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

board/atmel/at91sam9x5ek_mmc/genimage.cfg

@@ -0,0 +1,34 @@
+# Image for SD card boot on Atmel at91sam9x5ek boards
+#
+image boot.vfat {
+	vfat {
+		files = {
+			"zImage",
+			"at91sam9g15ek.dtb",
+			"at91sam9g25ek.dtb",
+			"at91sam9g35ek.dtb",
+			"at91sam9x25ek.dtb",
+			"at91sam9x35ek.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/at91sam9x5ek_mmc/post-image.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+BOARD_DIR="$(dirname $0)"
+GENIMAGE_CFG="${BOARD_DIR}/genimage.cfg"
+GENIMAGE_TMP="${BUILD_DIR}/genimage.tmp"
+
+rm -rf "${GENIMAGE_TMP}"
+
+echo --rootpath "${TARGET_DIR}"
+echo --tmppath "${GENIMAGE_TMP}"
+echo --inputpath "${BINARIES_DIR}"
+echo --outputpath "${BINARIES_DIR}"
+echo --config "${GENIMAGE_CFG}"
+
+genimage                               \
+	--rootpath "${TARGET_DIR}"     \
+	--tmppath "${GENIMAGE_TMP}"    \
+	--inputpath "${BINARIES_DIR}"  \
+	--outputpath "${BINARIES_DIR}" \
+	--config "${GENIMAGE_CFG}"