board: add support for liteBoard

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+# Minimal microSD card image for Grinn's liteBoard
+#
+# We mimic the .sdcard Freescale's image format for i.MX6UL:
+# * the microSD card must have 1 kB free space at the beginning,
+# * SPL is dumped as is,
+# * U-Boot is dumped at 69K offset, as configured in SPL
+# * a FAT partition at offset 8 MB is containing zImage and dtbs,
+# * a single root filesystem partition is required (Ext4 in this case).
+#
+
+image boot.vfat {
+  vfat {
+    files = {
+      "imx6ul-liteboard.dtb",
+      "zImage"
+    }
+  }
+  size = 16M
+}
+
+image sdcard.img {
+  hdimage {
+  }
+
+  partition SPL {
+    in-partition-table = "no"
+    image = "SPL"
+    offset = 1K
+  }
+
+  partition u-boot {
+    in-partition-table = "no"
+    image = "u-boot.img"
+    offset = 69K
+  }
+
+  partition boot {
+    partition-type = 0xC
+    bootable = "true"
+    image = "boot.vfat"
+    offset = 8M
+  }
+
+  partition rootfs {
+    partition-type = 0x83
+    image = "rootfs.ext4"
+  }
+}

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+#!/usr/bin/env bash
+
+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 $?

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+BR2_arm=y
+BR2_cortex_a7=y
+BR2_GLOBAL_PATCH_DIR="board/grinn/liteboard/patches"
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_8=y
+BR2_TARGET_GENERIC_GETTY_PORT="ttymxc0"
+BR2_SYSTEM_DHCP="eth0"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/grinn/liteboard/post-image.sh"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.8"
+BR2_LINUX_KERNEL_DEFCONFIG="imx_v6_v7"
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx6ul-liteboard"
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2016.09"
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="liteboard"
+BR2_TARGET_UBOOT_FORMAT_IMG=y
+BR2_TARGET_UBOOT_SPL=y
+BR2_TARGET_UBOOT_SPL_NAME="SPL"
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_MTOOLS=y