X-Git-Url: http://git.rohieb.name/openwrt.git/blobdiff_plain/c1b7257d2c1d31c1220d4f5ee697efb14380d7c2..49bbf085bb6c7712a2b8ed8f62b066f4f8040697:/openwrt/docs/buildroot-documentation.html
diff --git a/openwrt/docs/buildroot-documentation.html b/openwrt/docs/buildroot-documentation.html
index 36f294e60..ede3796a6 100644
--- a/openwrt/docs/buildroot-documentation.html
+++ b/openwrt/docs/buildroot-documentation.html
@@ -17,7 +17,7 @@
Usage and documentation by Felix Fietkau and Waldemar Brodkorb, based on uClibc Buildroot
documentation by Thomas Petazzoni. Contributions from Karsten Kruse,
- Ned Ludd, Martin Herren.
+ Ned Ludd, Martin Herren. OpenWrt Kernel Module Creation Howto by Markus Becker.
Last modification : $Id$
@@ -37,6 +37,14 @@
Location of downloaded packages
Extending OpenWrt with more Software
Ressources
+
+ About OpenWrt Kernel Module Compilation
+ Enable the kernel options
+ Create a buildroot option
+ Define the binary files for the kernel module
+ Specify the ipkg control file
+ Compile the kernel module
+
About OpenWrt Buildroot
@@ -88,10 +96,17 @@
Obtaining OpenWrt Buildroot
OpenWrt Buildroot is available via CVS - Concurrent Version System.
- For any kind of development you should get the latest version from cvs via:
+ For any kind of OpenWrt development you should get the latest version from cvs via:
$ cvs -d:pserver:anonymous@openwrt.org:/openwrt co openwrt
+ If you only like to create your own custom firmware images and pakages we
+ strongely suggest to use the CVS branch of the stable version (whiterussian):
+
+
+ $ cvs -d:pserver:anonymous@openwrt.org:/openwrt co -rwhiterussian openwrt
+
+
Using OpenWrt Buildroot
@@ -141,25 +156,13 @@
Customizing the
target filesystem
- There are two ways to customize the resulting target filesystem:
-
-
- - Customize the target filesystem directly, and rebuild the image. The
- target filesystem is available under
build_ARCH/root/
where
- ARCH
is the chosen target architecture, usually mipsel.
- You can simply make your changes here, and run make target_install afterwards,
- which will rebuild the target filesystem image. This method allows to do
- everything on the target filesystem, but if you decide to rebuild your toolchain,
- tools or packages, these changes will be lost.
-
- - Customize the target filesystem skeleton, available under
-
target/default/target_skeleton/
. You can customize
- configuration files or other stuff here. However, the full file hierarchy
- is not yet present, because it's created during the compilation process.
- So you can't do everything on this target filesystem skeleton, but
- changes to it remains even when you completely rebuild the cross-compilation
- toolchain and the tools.
-
+ You can customize the target filesystem skeleton, available under
+ package/base-files/default/
. You can change
+ configuration files or other stuff here. However, the full file hierarchy
+ is not yet present, because it's created during the compilation process.
+ So you can't do everything on this target filesystem skeleton, but
+ changes to it remains even when you completely rebuild the cross-compilation
+ toolchain and the tools.
Customizing the
Busybox configuration
@@ -452,31 +455,31 @@ foo-compile: bar-compile
Finally, here's the hardest part. Create a file named
Makefile
. It will contain the Makefile rules that
are in charge of downloading, configuring, compiling and installing
- the software. Below is an example that we will comment
- afterwards.
+ the software. Below is an example that we will comment afterwards.
1 # $Id$
- 2 include $(TOPDIR)/rules.mk
- 3 PKG_NAME:=foo
- 4 PKG_VERSION:=1.0
- 5 PKG_RELEASE:=1
- 6 PKG_MD5SUM:=4584f226523776a3cdd2fb6f8212ba8d
- 8 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
- 9 PKG_SOURCE_URL:=http://www.foosoftware.org/downloads
- 10 PKG_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
- 11 PKG_IPK:=$(PACKAGE_DIR)/$(PKG_NAME)_$(PKG_VERSION)-$(PKG_RELEASE)_$(ARCH).ipk
- 12 PKG_IPK_DIR:=$(PKG_DIR)/ipkg
- 13
- 14 $(DL_DIR)/$(PKG_SOURCE):
- 15 $(SCRIPT_DIR)/download.pl $(DL_DIR) $(PKG_SOURCE) $(PKG_MD5SUM) $(PKG_SOURCE_URL)
+ 2
+ 3 include $(TOPDIR)/rules.mk
+ 4
+ 5 PKG_NAME:=foo
+ 6 PKG_VERSION:=1.0
+ 7 PKG_RELEASE:=1
+ 8 PKG_MD5SUM:=4584f226523776a3cdd2fb6f8212ba8d
+ 9
+ 10 PKG_SOURCE_URL:=http://www.foosoftware.org/downloads
+ 11 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+ 12 PKG_CAT:=zcat
+ 13
+ 14 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
+ 15 PKG_INSTALL_DIR:=$(PKG_BUILD_DIR)/ipkg-install
16
- 17 $(PKG_DIR)/.source: $(DL_DIR)/$(PKG_SOURCE)
- 18 zcat $(DL_DIR)/$(PKG_SOURCE) | tar -C $(BUILD_DIR) $(TAR_OPTIONS) -
- 19 touch $(PKG_DIR)/.source
+ 17 include $(TOPDIR)/package/rules.mk
+ 18
+ 19 $(eval $(call PKG_template,FOO,foo,$(PKG_VERSION)-$(PKG_RELEASE),$(ARCH)))
20
- 21 $(PKG_DIR)/.configured: $(PKG_DIR)/.source
- 22 (cd $(PKG_DIR); \
+ 21 $(PKG_BUILD_DIR)/.configured:
+ 22 (cd $(PKG_BUILD_DIR); \
23 $(TARGET_CONFIGURE_OPTS) \
24 CFLAGS="$(TARGET_CFLAGS)" \
25 ./configure \
@@ -485,36 +488,37 @@ foo-compile: bar-compile
28 --build=$(GNU_HOST_NAME) \
29 --prefix=/usr \
30 --sysconfdir=/etc \
- 31 );
- 32 touch $(PKG_DIR)/.configured;
- 33
- 34 $(PKG_DIR)/$(PKG_NAME): $(PKG_DIR)/.configured
- 35 $(MAKE) CC=$(TARGET_CC) -C $(PKG_DIR)
- 36
- 37 $(PKG_IPK): $(PKG_DIR)/$(PKG_NAME)
- 38 $(SCRIPT_DIR)/make-ipkg-dir.sh $(PKG_IPK_DIR) $(PKG_NAME).control $(PKG_VERSION)-$(PKG_RELEASE) $(ARCH)
- 39 $(MAKE) prefix=$(PKG_IPK_DIR)/usr -C $(PKG_DIR) install
- 40 rm -Rf $(PKG_IPK_DIR)/usr/man
- 41 $(IPKG_BUILD) $(PKG_IPK_DIR) $(PACKAGE_DIR)
- 42
- 43 $(IPKG_STATE_DIR)/info/$(PKG_NAME).list: $(PKG_IPK)
- 44 $(IPKG) install $(PKG_IPK)
- 45
- 46 prepare: $(PKG_DIR)/.source
- 47 compile: $(PKG_IPK)
- 48 install: $(IPKG_STATE_DIR)/info/$(PKG_NAME).list
- 49 clean:
- 50 rm -rf $(PKG_DIR)
- 51 rm -f $(PKG_IPK)
+ 31 --with-bar="$(STAGING_DIR)/usr" \
+ 32 );
+ 33 touch $@
+ 34
+ 35 $(PKG_BUILD_DIR)/.built:
+ 36 rm -rf $(PKG_INSTALL_DIR)
+ 37 mkdir -p $(PKG_INSTALL_DIR)
+ 38 $(MAKE) -C $(PKG_BUILD_DIR) \
+ 39 $(TARGET_CONFIGURE_OPTS) \
+ 40 install_prefix="$(PKG_INSTALL_DIR)" \
+ 41 all install
+ 42 touch $@
+ 43
+ 44 $(IPKG_FOO):
+ 46 install -d -m0755 $(IDIR_FOO)/usr/sbin
+ 47 cp -fpR $(PKG_INSTALL_DIR)/usr/sbin/foo $(IDIR_FOO)/usr/sbin
+ 49 $(RSTRIP) $(IDIR_FOO)
+ 50 $(IPKG_BUILD) $(IDIR_FOO) $(PACKAGE_DIR)
+ 51
+ 52 mostlyclean:
+ 53 make -C $(PKG_BUILD_DIR) clean
+ 54 rm $(PKG_BUILD_DIR)/.built
First of all, this Makefile example works for a single
binary software. For other software such as libraries or more
complex stuff with multiple binaries, it should be adapted. Look at
- the other Makefile
files in the package
+ the other Makefile
files in the package/
directory.
- At lines 3-12, a couple of useful variables are defined :
+ At lines 5-15, a couple of useful variables are defined:
PKG_NAME
: The package name, e.g. foo.
@@ -523,45 +527,42 @@ foo-compile: bar-compile
should be downloaded.
PKG_RELEASE
: The release number that will be
- appended to the version number of your ipkg package.
+ appended to the version number of your ipkg package.
- PKG_MD5SUM
: The md5sum of the software archive.
-
- PKG_SOURCE
: The name of the tarball of
- your package on the download website of FTP site. As you can see
- PKG_NAME
and PKG_VERSION
are used.
+ PKG_MD5SUM
: The md5sum of the software archive.
PKG_SOURCE_URL
: Space separated list of the HTTP
or FTP sites from which the archive is downloaded. It must include the complete
path to the directory where FOO_SOURCE
can be
found.
- PKG_DIR
: The directory into which the software
+ PKG_SOURCE
: The name of the tarball of
+ your package on the download website of FTP site. As you can see
+ PKG_NAME
and PKG_VERSION
are used.
+
+ PKG_CAT
: The tool needed for extraction of the
+ software archive.
+
+ PKG_BUILD_DIR
: The directory into which the software
will be configured and compiled. Basically, it's a subdirectory
- of BUILD_DIR
which is created upon decompression of
+ of BUILD_DIR
which is created upon extraction of
the tarball.
- PKG_IPK
: The resulting ipkg package
+ PKG_INSTALL_DIR
: The directory into the software
+ will be installed. It is a subdirectory of PKG_BUILD_DIR
.
- Lines 14-15 defines a target that downloads the tarball from
- the remote site to the download directory
- (DL_DIR
).
-
- Lines 17-19 defines a target and associated rules that
- uncompress the downloaded tarball. As you can see, this target
- depends on the tarball file, so that the previous target (line
- 14-15) is called before executing the rules of the current
- target. Uncompressing is followed by touching a hidden file
- to mark the software has having been uncompressed. This trick is
- used everywhere in Buildroot Makefile to split steps
- (download, uncompress, configure, compile, install) while still
- having correct dependencies.
-
- Lines 21-32 defines a target and associated rules that
+
In Line 3 and 17 we include common variables and routines to simplify
+ the process of ipkg creation. It includes routines to download, verify
+ and extract the software package archives.
+
+ Line 19 contains the magic line which automatically creates the
+ ipkg for us.
+
+ Lines 21-33 defines a target and associated rules that
configures the software. It depends on the previous target (the
- hidden .source
file) so that we are sure the software has
+ hidden .prepared
file) so that we are sure the software has
been uncompressed. In order to configure it, it basically runs the
well-known ./configure
script. As we may be doing
cross-compilation, target
, host
and
@@ -571,41 +572,31 @@ foo-compile: bar-compile
filesystem. Finally it creates a .configured
file to
mark the software as configured.
- Lines 34-35 defines a target and a rule that compiles the
+
Lines 35-42 defines a target and a rule that compiles the
software. This target will create the binary file in the
compilation directory, and depends on the software being already
configured (hence the reference to the .configured
- file). It basically runs make
inside the source
- directory.
-
- Lines 37-41 defines a target and associated rules that create
- the ipkg package which can optionally be embedded into
- the resulting firmware image. It depends on the binary file in
- the source directory, to make sure the software has been compiled.
- It uses the make-ipkg-dir.sh script, which will create the ipkg
- build directory for your package, copy your control file into
- that directory and add version and architecture information.
- Then it calls the install
target of the
- software Makefile
by passing a prefix
- argument, so that the Makefile
doesn't try to install
- the software inside host /usr
but inside target
- /usr
. After the installation, the
- /usr/man
directory inside the target filesystem is
- removed to save space.
+ file). Afterwards it installs the resulting binary into the
+ PKG_INSTALL_DIR
. It basically runs
+ make install
inside the source directory.
+
+ Lines 44-50 defines a target and associated rules that create
+ the ipkg package, which can optionally be embedded into
+ the resulting firmware image. It manually installs all files you
+ want to integrate in your resulting ipkg. RSTRIP
will
+ recursevily strip all binaries and libraries.
Finally IPKG_BUILD
is called to create the package.
- Line 43 and 44 define the installation target of your package,
- which will embed the software into the target filesystem.
-
- Lines 46-51 define the main targets that the Makefile in the
- package
dir calls.
-
- prepare
: Download and unpack the source
- compile
: Compile the source and create the package
- install
: Embed the package into the target filesystem
- clean
: Remove all the files created by the build process
-
-
+ If you want other targets to be executed at compile
,
+ install
or clean
time (e.g. for installing
+ a library into the staging dir), just create the targets (usually
+ install-dev
and uninstall-dev
) and enable
+ them like this:
+
+compile-targets: install-dev
+clean-targets: uninstall-dev
+
+
Conclusion
As you can see, adding a software to buildroot is simply a
@@ -614,13 +605,104 @@ foo-compile: bar-compile
the software.
If you package software that might be useful for other persons,
- don't forget to send a patch to OpenWrt developers !
+ don't forget to send a patch to OpenWrt developers!
+ Use the mail address: openwrt-devel@openwrt.org
+
Resources
- To learn more about OpenWrt Buildroot you can visit this
- website: http://openwrt.org/
+ To learn more about OpenWrt, you can visit this website:
+ http://openwrt.org/
+
+
+
+
+
+
OpenWrt Kernel Module Creation Howto
+
+
+
About OpenWrt Kernel Module Compilation
+
+
You are planning to compile a kernel module? This howto will
+explain what you have to do, to have your kernel module installable as
+an ipkg.
+
+
Enable the kernel options
+
+
Enable the kernel options you want by modifying
+build_mipsel/linux/.config. We are assuming, that you already had your
+kernel compiled once here. You can do the modification by hand or by
+
+
+$ cd build_mipsel/linux
+$ make menuconfig
+
+
+And copy it, so your changes are not getting lost, when doing a 'make
+dirclean'. Here we assume that you are compiling for Broadcom chipset
+based devices:
+
+
$ cp .config ../../../target/linux/linux-2.4/config/brcm
+
+
+
Create a buildroot option
+
+
Create a buildroot option by modifying/inserting into
+target/linux/Config.in, e.g.
+
+
+config BR2_PACKAGE_KMOD_USB_KEYBOARD
+ tristate "Support for USB keyboards"
+ default m
+ depends BR2_PACKAGE_KMOD_USB_CONTROLLER
+
+
+
+
Define the binary files for the kernel module
+
+
Define the binary files for the kernel module by modifying/inserting into
+target/linux/linux-2.4/Makefile, e.g.
+
+$(eval $(call KMOD_template,USB_KEYBOARD,usb-kbd,\
+ $(MODULES_DIR)/kernel/drivers/input/input.o \
+ $(MODULES_DIR)/kernel/drivers/input/keybdev.o \
+ $(MODULES_DIR)/kernel/drivers/usb/usbkbd.o \
+,CONFIG_USB_KEYB,kmod-usb-core,60,input keybdev usbkbd))
+
+
+Where CONFIG_USB_KEYB is the kernel option, USB_KEYBOARD is the last
+part of BR2_PACKAGE_KMOD_USB_KEYBOARD and usb-kbd is part of the
+filename of the created ipkg.
+
+
Specify the ipkg control file
+
+
Create e.g. target/linux/control/kmod-usb-kbd.control with content similar to this:
+
+
+Package: kmod-usb-kbd
+Priority: optional
+Section: sys
+Maintainer: Markus Becker <mab@comnets.uni-bremen.de>
+Source: buildroot internal
+Description: Kernel Support for USB Keyboards
+
+
+
+
Compile the kernel module
+
+
Enable the kernel module with
+
+$ make menuconfig
+
+ in TOPDIR and selecting it.
+
+ Compile with
+
+$ make dirclean && make
+
+
+