defaultenv: Add boot option for DFU

DFU is for device firmware upgrade, but for development purposes it's
sometmes useful to just start a kernel vie DFU. This adds a boot option
for doing this and also the corresponding counterpart on the host. With
this it's possible to boot a system with:

scripts/dfuboot.sh -k linuximage -d dtb -c "root=ubi0:root ubi.mtd=ubi rootfstype=ubifs ignore_loglevel"

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

common/Kconfig

@@ -593,6 +593,12 @@ config DEFAULT_ENVIRONMENT_GENERIC_NEW_MENU
 	depends on CONFIG_CMD_MENU_MANAGEMENT
 	default y
 
+config DEFAULT_ENVIRONMENT_GENERIC_NEW_DFU
+	bool
+	depends on DEFAULT_ENVIRONMENT_GENERIC_NEW
+	depends on USB_GADGET_DFU
+	default y
+
 config DEFAULT_ENVIRONMENT_GENERIC
 	bool
 	depends on !HAVE_DEFAULT_ENVIRONMENT_NEW

defaultenv/Makefile

@@ -1,5 +1,6 @@
 bbenv-$(CONFIG_DEFAULT_ENVIRONMENT_GENERIC_NEW) += defaultenv-2-base
 bbenv-$(CONFIG_DEFAULT_ENVIRONMENT_GENERIC_NEW_MENU) += defaultenv-2-menu
+bbenv-$(CONFIG_DEFAULT_ENVIRONMENT_GENERIC_NEW_DFU) += defaultenv-2-dfu
 bbenv-$(CONFIG_DEFAULT_ENVIRONMENT_GENERIC) += defaultenv-1
 obj-$(CONFIG_DEFAULT_ENVIRONMENT) += defaultenv.o
 extra-y += barebox_default_env barebox_default_env.h barebox_default_env$(DEFAULT_COMPRESSION_SUFFIX)

defaultenv/defaultenv-2-dfu/boot/dfu

@@ -0,0 +1,39 @@
+#!/bin/sh
+
+if [ "$1" = menu ]; then
+	boot-menu-add-entry "$0" "Device Firmware upgrade (DFU)"
+	exit
+fi
+
+if [ -d /dfutmp ]; then
+	rm -r /dfutmp
+fi
+
+mkdir -p /dfutmp
+
+kernel="/dfutmp/kernel"
+dtb="/dfutmp/dtb"
+cmdline="/dfutmp/cmdline"
+
+global.bootm.image="$kernel"
+
+dfu $kernel(kernel)c,$dtb(dtb)c,$cmdline(cmdline)c
+if [ $? != 0 ]; then
+	exit 1
+fi
+
+if [ ! -f "$kernel" ]; then
+	echo "No kernel uploaded. Aborting"
+	exit 1
+fi
+
+if [ -f "$cmdline" ]; then
+	global linux.bootargs.dyn.dfu
+	readf $cmdline global.linux.bootargs.dyn.dfu
+fi
+
+if [ -f "$dtb" ]; then
+	global.bootm.oftree="$dtb"
+fi
+
+true

defaultenv/defaultenv.c

@@ -46,6 +46,8 @@ static void defaultenv_add_base(void)
 		defaultenv_append_directory(defaultenv_2_base);
 	if (IS_ENABLED(CONFIG_DEFAULT_ENVIRONMENT_GENERIC_NEW_MENU))
 		defaultenv_append_directory(defaultenv_2_menu);
+	if (IS_ENABLED(CONFIG_DEFAULT_ENVIRONMENT_GENERIC_NEW_DFU))
+		defaultenv_append_directory(defaultenv_2_dfu);
 	if (IS_ENABLED(CONFIG_DEFAULT_ENVIRONMENT_GENERIC))
 		defaultenv_append_directory(defaultenv_1);
 

scripts/dfuboot.sh

@@ -0,0 +1,68 @@
+#!/bin/bash
+
+DEVICETREE=
+KERNEL=
+CMDLINE=
+
+usage() {
+	echo "usage: $0 [OPTIONS]"
+	echo "This script uploads a kernel and optionally a devicetree"
+	echo "and a kernel commandline to barebox via DFU running the"
+	echo "'boot dfu' command."
+	echo "OPTIONS:"
+	echo "  -k <kernel>       kernelimage to upload"
+	echo "  -d <dtb>          devicetree binary blob to upload"
+	echo "  -c \"cmdline\"      kernel commandline"
+	echo "  -h                This help text"
+
+	exit 0
+}
+
+while getopts "k:d:c:h" opt
+do
+	case "$opt" in
+	h)
+		usage
+		;;
+	d)
+		DEVICETREE="$OPTARG"
+		;;
+	k)
+		KERNEL="$OPTARG"
+		;;
+	c)
+		CMDLINE="$OPTARG"
+		;;
+	esac
+done
+
+dfu-util -D "${KERNEL}" -a kernel
+if [ $? != 0 ]; then
+	echo "Failed to upload kernel"
+	exit 1
+fi
+
+if [ -n "$DEVICETREE" ]; then
+	dfu-util -D "${DEVICETREE}" -a dtb
+	if [ $? != 0 ]; then
+		echo "Failed to upload devicetree"
+		exit 1
+	fi
+fi
+
+if [ -n "$CMDLINE" ]; then
+	cmdlinefile=$(mktemp)
+
+	echo -e "$CMDLINE" > "${cmdlinefile}"
+
+	dfu-util -D "${cmdlinefile}" -a cmdline -R
+	result=$?
+
+	rm -f "${cmdlinefile}"
+
+	if [ $result != 0 ]; then
+		echo "Failed to upload cmdline"
+		exit 1
+	fi
+
+fi