u-boot-fw-utils: add patch with minimal U-Boot environment API

Implements functions to get and set variables from U-Boot's environment.

https://jira.digi.com/browse/DEL-3358

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-arm/recipes-bsp/u-boot/u-boot-fw-utils/0004-Implement-U-Boot-environment-access-functions.patch

@@ -0,0 +1,146 @@
+From: Javier Viguera <javier.viguera@digi.com>
+Date: Tue, 10 Jan 2017 19:34:26 +0100
+Subject: [PATCH] Implement U-Boot environment access functions
+
+Signed-off-by: Javier Viguera <javier.viguera@digi.com>
+---
+ tools/env/Makefile   |  2 +-
+ tools/env/ubootenv.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++
+ tools/env/ubootenv.h | 46 ++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 109 insertions(+), 1 deletion(-)
+ create mode 100644 tools/env/ubootenv.c
+ create mode 100644 tools/env/ubootenv.h
+
+diff --git a/tools/env/Makefile b/tools/env/Makefile
+index fa2a564bb357..b29dcea16fe8 100644
+--- a/tools/env/Makefile
++++ b/tools/env/Makefile
+@@ -25,7 +25,7 @@ hostprogs-y := fw_printenv
+ 
+ lib-y += fw_env.o \
+ 	crc32.o ctype.o linux_string.o \
+-	env_attr.o env_flags.o aes.o ../../lib/md5.o
++	env_attr.o env_flags.o aes.o ../../lib/md5.o ubootenv.o
+ 
+ fw_printenv-objs := fw_env_main.o $(lib-y)
+ 
+diff --git a/tools/env/ubootenv.c b/tools/env/ubootenv.c
+new file mode 100644
+index 000000000000..db789a55adaa
+--- /dev/null
++++ b/tools/env/ubootenv.c
+@@ -0,0 +1,62 @@
++/*
++ * Copyright (c) 2017, Digi International Inc.
++ *
++ * This Source Code Form is subject to the terms of the Mozilla Public
++ * License, v. 2.0. If a copy of the MPL was not distributed with this
++ * file, you can obtain one at http://mozilla.org/MPL/2.0/.
++ *
++ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
++ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
++ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
++ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
++ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
++ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
++ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
++ *
++ * Description: U-Boot environment get/set wrappers
++ *
++ */
++
++#include <stdio.h>
++
++#include "fw_env.h"
++
++/*
++ * Function:    uboot_getenv
++ * Description: get U-Boot's environment variable
++ */
++int uboot_getenv(char *name, const char **value)
++{
++	int ret = 0;
++
++	ret = fw_env_open();
++	if (ret)
++		goto err;
++
++	*value = fw_getenv(name);
++
++err:
++	return ret ? -1 : 0;
++}
++
++/*
++ * Function:    uboot_setenv
++ * Description: set U-Boot's environment variable
++ */
++int uboot_setenv(char *name, char *value)
++{
++	int ret = 0;
++
++	ret = fw_env_open();
++	if (ret)
++		goto err;
++
++	ret = fw_env_write(name, value);
++	if (ret)
++		goto err;
++
++	ret = fw_env_close();
++
++err:
++	return ret ? -1 : 0;
++}
+diff --git a/tools/env/ubootenv.h b/tools/env/ubootenv.h
+new file mode 100644
+index 000000000000..d4043db75372
+--- /dev/null
++++ b/tools/env/ubootenv.h
+@@ -0,0 +1,46 @@
++/*
++ * Copyright (c) 2017, Digi International Inc.
++ *
++ * This Source Code Form is subject to the terms of the Mozilla Public
++ * License, v. 2.0. If a copy of the MPL was not distributed with this
++ * file, you can obtain one at http://mozilla.org/MPL/2.0/.
++ *
++ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
++ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
++ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
++ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
++ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
++ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
++ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
++ *
++ * Description: U-Boot environment get/set wrappers
++ *
++ */
++
++#ifndef UBOOTENV_H
++#define UBOOTENV_H
++
++/*
++ * Get U-Boot's environment variable.
++ *
++ * Params:
++ *   'name'  (input)   Name of the environment variable
++ *   'value' (output)  Pointer to the variable's value
++ *                     (NULL if not found)
++ *
++ * Return: 0 on sucess, -1 on failure
++ */
++int uboot_getenv(char *name, const char **value);
++
++/*
++ * Set U-Boot's environment variable.
++ *
++ * Params:
++ *   'name'  (input)  Name of the environment variable
++ *   'value' (input)  Value of the environment variable
++ *
++ * Return: 0 on sucess, -1 on failure
++ */
++int uboot_setenv(char *name, char *value);
++
++#endif /* UBOOTENV_H */

meta-digi-arm/recipes-bsp/u-boot/u-boot-fw-utils_%.bbappend

@@ -6,6 +6,7 @@ SRC_URI += " \
 	file://fw_env.config \
 	file://0001-tools-env-implement-support-for-environment-encrypti.patch \
 "
+SRC_URI_append = " file://0004-Implement-U-Boot-environment-access-functions.patch"
 SRC_URI_append_ccimx6 = " file://0002-fw_env-add-support-to-unlock-emmc-boot-partition.patch"
 
 # We do not have a platform defconfig in this version of u-boot, so just use the generic
@@ -14,6 +15,8 @@ UBOOT_CONFIG = "sandbox"
 UBOOT_CONFIG[sandbox] = "sandbox_defconfig"
 
 do_install_append() {
+	install -d ${D}${includedir}/libubootenv
+	install -m 0644 ${S}/tools/env/ubootenv.h ${D}${includedir}/libubootenv/
 	install -m 0644 ${WORKDIR}/fw_env.config ${D}${sysconfdir}/
 }