X-Git-Url: https://git.rohieb.name/openwrt.git/blobdiff_plain/c1b7257d2c1d31c1220d4f5ee697efb14380d7c2..feab1d97643b297d3b1231c48edbb10a832681b5:/openwrt/docs/buildroot-documentation.html?ds=inline diff --git a/openwrt/docs/buildroot-documentation.html b/openwrt/docs/buildroot-documentation.html index 36f294e60..d23763987 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

    @@ -87,11 +95,18 @@

    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:

    +

    OpenWrt Buildroot is available via SVN aka subversion. + For any kind of OpenWrt development you should get the latest version from svn via:

    - $ cvs -d:pserver:anonymous@openwrt.org:/openwrt co openwrt
    + $ svn co https://svn.openwrt.org/openwrt/trunk/
     
    +

    If you only like to create your own custom firmware images and packages we + strongly suggest to use the SVN branch of the stable version (whiterussian): +

    +
    + $ svn co https://svn.openwrt.org/openwrt/branches/whiterussian/
    +
    +

    Using OpenWrt Buildroot

    @@ -153,7 +168,7 @@ tools or packages, these changes will be lost.
  • Customize the target filesystem skeleton, available under - target/default/target_skeleton/. You can customize + package/base-files/default/. 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 @@ -280,7 +295,7 @@ default) and the target filesystem skeleton. This directory will contain 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.
  • + and then removes useless SVN/ directories.
  • Call the prepare, compile and install targets for the subdirectories toolchain, package @@ -452,31 +467,31 @@ 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: $(PKG_BUILD_DIR)/.prepared
    +    22          (cd $(PKG_BUILD_DIR); \
         23                  $(TARGET_CONFIGURE_OPTS) \
         24                  CFLAGS="$(TARGET_CFLAGS)" \
         25                  ./configure \
    @@ -485,36 +500,37 @@ 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:

    -

    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 ./configurescript. As we may be doing cross-compilation, target, host and @@ -571,41 +584,21 @@ 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. -

    -

    Conclusion

    As you can see, adding a software to buildroot is simply a @@ -614,13 +607,104 @@ 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
    +
    +

    +