Add mtd-rw kernel module

This package adds a kernel module that, when loaded, makes all
read-only MTD partitions writeable. This can be used to update
the bootloader, modify bootloader environment partitions, etc.

Signed-off-by: Joseph C. Lehner <joseph.c.lehner@gmail.com>

kernel/mtd-rw/Makefile

@@ -0,0 +1,49 @@
+#
+# Copyright (C) 2016 Joseph C. Lehner <joseph.c.lehner@gmail.com>
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_NAME:=mtd-rw
+PKG_VERSION:=git-20160214
+PKG_RELEASE:=1
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://github.com/jclehner/mtd-rw.git
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_SUBDIR=$(PKG_NAME)-$(PKG_VERSION)
+PKG_SOURCE_VERSION=7e8562067d6a366c8cbaa8084396c33b7e12986b
+
+PKG_MAINTAINER=Joseph C. Lehner <joseph.c.lehner@gmail.com>
+PKG_LICENSE=GPL-2.0
+PKG_LICENSE_FILES=LICENSE
+
+include $(INCLUDE_DIR)/package.mk
+
+define KernelPackage/mtd-rw
+	SUBMENU:=Other modules
+	TITLE:=Write-enabler for MTD partitions
+	FILES:=$(PKG_BUILD_DIR)/mtd-rw.ko
+endef
+
+define KernelPackage/mtd-rw/description
+	A kernel module that temporarily makes all MTD partitions writeable.
+endef
+
+MAKE_OPTS:= \
+	ARCH="$(LINUX_KARCH)" \
+	CROSS_COMPILE="$(TARGET_CROSS)" \
+	M="$(PKG_BUILD_DIR)"
+
+define Build/Compile
+	$(MAKE) -C "$(LINUX_DIR)" \
+			$(MAKE_OPTS) \
+			CONFIG_MTD_RW=m \
+			modules
+endef
+
+$(eval $(call KernelPackage,mtd-rw))