Move buildroot to bsp directory.

bsp/buildroot/board/acmesystems/arietta-g25/genimage.cfg

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+# Minimal SD card image for the Acmesystems Arietta G25
+#
+image boot.vfat {
+	vfat {
+		file zImage {
+			image = "zImage"
+		}
+
+		file acme-arietta.dtb {
+			image = "at91-ariag25.dtb"
+		}
+
+		file boot.bin {
+			image = "at91sam9x5_arietta-sdcardboot-linux-zimage-dt-3.7.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
+	}
+}

bsp/buildroot/board/acmesystems/arietta-g25/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}"
+
+exit $?

bsp/buildroot/board/acmesystems/arietta-g25/readme.txt

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+Acmesystems Arietta G25
+
+Intro
+=====
+
+This default configuration will allow you to start experimenting with the
+buildroot environment for the Arietta G25. With the current configuration
+it will bring-up the board, and allow access through the serial console.
+
+You can find additional informations, tutorials and a very comprehensive
+documentation on http://www.acmesystems.it/arietta.
+
+Build instructions
+==================
+
+To build an image for the arietta g25 choose the configuration
+corresponding to the arietta variant.
+
+For 128MB RAM variant type:
+
+$ make acmesystems_arietta_g25_128mb_defconfig
+
+else for 256MB RAM variant type:
+
+$ make acmesystems_arietta_g25_256mb_defconfig
+
+then:
+
+$ make
+
+How to write the microSD card
+=============================
+
+Once the build process is finished you will have an image called "sdcard.img"
+in the output/images/ directory.
+
+Copy the bootable "sdcard.img" onto an SD card with "dd":
+
+  $ sudo dd if=output/images/sdcard.img of=/dev/sdX
+
+Insert the microSD card into the arietta slot and power it.
+
+The image just built is fairly basic and the only output
+you will get is on serial console, please consider to use a DPI
+cable (http://www.acmesystems.it/DPI)