Merge "Support for UBoot."

elements/uboot/README.md

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+Perform kernel/initrd post-processing for UBoot.
+
+This element helps post-process the kernel/initrd
+for use with uboot. It works with ramdisk images
+as well as user images.
+
+This element needs u-boot-tools to be installed
+on the host.
+
+The load address and entry point for UBoot kernel
+can be specified as shown in the example below.
+
+Example:
+    export UBOOT\_KERNEL\_ADDR=0x80000
+    export UBOOT\_KERNEL\_EP=0x80000

elements/uboot/cleanup.d/98-uboot

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+#!/bin/bash
+
+set -eux
+set -o pipefail
+
+function post_process()
+{
+    mkimage -A $1 -O linux -T kernel -C none -a $UBOOT_KERNEL_ADDR -e $UBOOT_KERNEL_EP -n "Kernel" -d $KERNEL uImage
+    mv uImage $KERNEL
+    mkimage -A $1 -O linux -T ramdisk -a 0 -n "RAMdisk" -C gzip -d $RAMDISK uInitrd
+    mv uInitrd $RAMDISK
+}
+
+UBOOT_KERNEL_ADDR=${UBOOT_KERNEL_ADDR:-0x80000}
+UBOOT_KERNEL_EP=${UBOOT_KERNEL_EP:-0x80000}
+[ -n "$TARGET_ROOT" ]
+
+# Check if RAMDISK is being built.
+if [ -f "$TARGET_ROOT/tmp/ramdisk" ] ; then
+    KERNEL="$TARGET_ROOT/tmp/kernel"
+    RAMDISK="$TARGET_ROOT/tmp/ramdisk"
+else
+    source "$_LIB/img-functions"
+    # Dig up the initrd and kernel to use.
+    select_boot_kernel_initrd "$TARGET_ROOT"
+    KERNEL="$TARGET_ROOT/boot/$KERNEL"
+    RAMDISK="$TARGET_ROOT/boot/$RAMDISK"
+fi
+
+case "$ARCH" in
+    arm*)
+        post_process arm
+        ;;
+esac