X-Git-Url: http://git.rohieb.name/openwrt.git/blobdiff_plain/bfbc1b25f846cf4c3e024553d57cef05431c35ed..20f34f1af6cf492a68987eeb5be70f10edcf3374:/openwrt/docs/buildroot-documentation.html diff --git a/openwrt/docs/buildroot-documentation.html b/openwrt/docs/buildroot-documentation.html index 48b05728e..85cce4780 100644 --- a/openwrt/docs/buildroot-documentation.html +++ b/openwrt/docs/buildroot-documentation.html @@ -15,7 +15,7 @@
Usage and documentation by Felix Fietkau, based on uClibc Buildroot +
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.
@@ -80,17 +80,18 @@gcc
, binutils
, uClibc and all the tools by hand.
Of course, doing so is possible. But dealing with all configure options,
with all problems of every gcc
or binutils
- version it very time-consuming and uninteresting. OpenWrt Buildroot automates this
+ version is very time-consuming and uninteresting. OpenWrt Buildroot automates this
process through the use of Makefiles, and has a collection of patches for
each gcc
and binutils
version to make them work
- on the MIPS architecture of most Broadcom based Wireless Routers.
+ on the MIPS architecture of most Wireless Routers.
OpenWrt Buildroot is currently available as experimental snapshots
- -The latest snapshot is always available at http://openwrt.org/downloads/experimental/, +
OpenWrt Buildroot is available via CVS - Concurrent Version System. + For any kind of development you should get the latest version from cvs via:
++ $ cvs -d:pserver:anonymous@openwrt.org:/openwrt co openwrt +
jffs2
contains a writable root filesystem, which will expand to
- the size of your flash image. Note that you if you use the generic firmware
- Image, you need to pick the right image for your Flash size, because of different
+ the size of your flash image. Note: if you use the generic firmware image, you
+ need to pick the right image for your flash size, because of different
eraseblock sizes.
squashfs
contains a read-only root filesystem using a modified
@@ -196,7 +197,7 @@
configuration, and the latter is used if you have selected
locale support.
-
target
directory) contains the
Makefiles and associated files for software related to the generation of
- the target root filesystem image. Two types of filesystems are supported
+ the target root filesystem image and the linux kernel for the different
+ system on a chip boards, used in the Wireless Routers.
+ Two types of filesystems are supported
: jffs2 and squashfs.
@@ -275,7 +278,7 @@
build_ARCH/root/
by
default) and the target filesystem skeleton. This directory will contain
- the final root filesystem. To setup it up, it first deletes it, then it
+ the final root filesystem. To set it up, it first deletes it, then it
copies the skeleton available in target/default/target_skeleton
and then removes useless CVS/
directories.For example, you may add the following to your
.bashrc
(considering you're building for the MIPS
architecture and that Buildroot is located in
- ~/buildroot/
) :
~/openwrt/
) :
-export PATH=$PATH:~/buildroot/staging_dir_mipsel/bin/ +export PATH=$PATH:~/openwrt/staging_dir_mipsel/bin/
Then you can simply do :
@@ -343,7 +346,7 @@ mipsel-linux-uclibc-gcc -o foo foo.c downloaded by the Makefiles are all stored in theDL_DIR
which by default is the dl
directory. It's useful for example if you want to keep a complete
- version of Buildroot which is know to be working with the
+ version of Buildroot which is known to be working with the
associated tarballs. This will allow you to regenerate the
toolchain and the target filesystem with exactly the same
versions.
@@ -368,15 +371,39 @@ mipsel-linux-uclibc-gcc -o foo foo.c
config BR2_PACKAGE_FOO - tristate "foo" - default n + tristate "foo - some nice tool" + default m if CONFIG_DEVEL help This is a comment that explains what foo is.+
If you depend on other software or library inside the Buildroot, it
+ is important that you automatically select these packages in your
+ Config.in
. Example if foo depends on bar library:
+
+config BR2_PACKAGE_FOO + tristate "foo - some nice tool" + default m if CONFIG_DEVEL + select BR2_PACKAGE_LIBBAR + help + This is a comment that explains what foo is. ++
Of course, you can add other options to configure particular things in your software.
+Config.in
in the package directoryTo add your package to the configuration tool, you need
+ to add the following line to package/Config.in
,
+ please add it to a section, which fits the purpose of foo:
+
+
+comment "Networking" +source "package/foo/Config.in" ++
Makefile
in the package directoryTo add your package to the build process, you need to edit @@ -390,18 +417,18 @@ package-$(BR2_PACKAGE_FOO) += foo
As you can see, this short line simply adds the target
foo
to the list of targets handled by OpenWrt Buildroot.
In addition to the default dependencies, you make your package - depend on another package (e.g. a library) by adding a line: +
In addition to the default dependencies, you make your package + depend on another package (e.g. a library) by adding a line:
foo-compile: bar-compile-
Additionally, you need to create a control file which contains information about your package, readable by the ipkg package - utility.
+ utility. It should be created as file: +package/foo/ipkg/foo.control
The file looks like this
@@ -411,44 +438,45 @@ foo-compile: bar-compile 3 Section: net 4 Maintainer: Foo Software <foo@foosoftware.com> 5 Source: http://foosoftware.com - 6 Description: Your Package Description + 6 Depends: libbar + 7 Description: Package DescriptionYou can skip the usual Version:
and Architecture
fields, as they will be generated by the make-ipkg-dir.sh
script
- called from your Makefile
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.
1 # $Id$ - 2 include $(TOPDIR)/rules.mk - 3 PKG_NAME:=foo - 4 PKG_VERSION:=1.0 - 5 PKG_RELEASE:=1 - 6 PKG_MD5SUM:=4584f226523776a3cdd2fb6f8212ba8d - 7 - 8 PKG_SOURCE:=$(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: $(PKG_BUILD_DIR)/.prepared + 22 (cd $(PKG_BUILD_DIR); \ 23 $(TARGET_CONFIGURE_OPTS) \ 24 CFLAGS="$(TARGET_CFLAGS)" \ 25 ./configure \ @@ -457,36 +485,37 @@ 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.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
@@ -543,41 +569,21 @@ 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 sourcecompile
: Compile the source and create the packageinstall
: Embed the package into the target filesystemclean
: Remove all the files created by the build processAs you can see, adding a software to buildroot is simply a @@ -586,12 +592,14 @@ 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: patches@openwrt.org +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/