From 9460079914db580c5435a74c50c8b01d46312fc1 Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Sun, 5 Dec 2010 21:52:45 +0100 Subject: documentation: Update to explain how board support works Signed-off-by: Thomas Petazzoni Signed-off-by: Peter Korsgaard --- docs/buildroot.html | 117 ++++++++++++++++------------------------------------ 1 file changed, 36 insertions(+), 81 deletions(-) (limited to 'docs/buildroot.html') diff --git a/docs/buildroot.html b/docs/buildroot.html index 8293c8fec..9d6e835f6 100644 --- a/docs/buildroot.html +++ b/docs/buildroot.html @@ -578,87 +578,42 @@ $(ZLIB_DIR)/libz.a: $(ZLIB_DIR)/.configured

Creating your own board support

-

Creating your own board support in Buildroot allows you to have - a convenient place to store your project's target filesystem skeleton - and configuration files for Buildroot, Busybox, uClibc, and the kernel. - -

Follow these steps to integrate your board in Buildroot:

- -
    -
  1. Create a new directory in target/device/ named - after your company or organization
    2. - -
  2. Add a line source - "target/device/yourcompany/Config.in" in - target/device/Config.in so that your board appears - in the configuration system
    3. - -
  3. In target/device/yourcompany/, create a - directory for your project. This way, you'll be able to store - several of your company's projects inside Buildroot.
    4. - -
  4. Create a target/device/yourcompany/Config.in - file that looks like the following: - -
    -menuconfig BR2_TARGET_COMPANY
-	bool "Company projects"
-
-if BR2_TARGET_COMPANY
-
-config BR2_TARGET_COMPANY_PROJECT_FOOBAR
-	bool "Support for Company project Foobar"
-	help
-	  This option enables support for Company project Foobar
-
-endif
-
    - - Of course, you should customize the different values to match your - company/organization and your project. This file will create a - menu entry that contains the different projects of your - company/organization.
    5. - -
  5. Create a target/device/yourcompany/Makefile.in - file that looks like the following: - -
    -ifeq ($(BR2_TARGET_COMPANY_PROJECT_FOOBAR),y)
-include target/device/yourcompany/project-foobar/Makefile.in
-endif
-
    - -
    6. - -
  6. Create the - target/device/yourcompany/project-foobar/Makefile.in - file. It is recommended that you define a - BOARD_PATH variable set to - target/device/yourcompany/project-foobar as it - will simplify further definitions. Then, the file might define - one or more of the following variables: -
      -
    • TARGET_SKELETON to a directory that contains - the target skeleton for your project. If this variable is - defined, this target skeleton will be used instead of the - default one. If defined, the convention is to define it to - $(BOARD_PATH)/target_skeleton so that the target - skeleton is stored in the board specific directory.
      • -
    -
    7. - -
  7. In the - target/device/yourcompany/project-foobar/ - directory you can store configuration files for the kernel, - Busybox or uClibc. - - You can furthermore create one or more preconfigured configuration - files, referencing those files. These config files are named - something_defconfig and are stored in the toplevel - configs/ directory. Your users will then be able - to run make something_defconfig and get the right - configuration for your project
    8. -
+

Creating your own board support in Buildroot allows users of a + particular hardware platform to easily build a system that is + known to work.

+ +

To do so, you need to create a normal Buildroot configuration + that builds a basic system for the hardware: toolchain, kernel, + bootloader, filesystem and a simple Busybox-only userspace. No + specific package should be selected: the configuration should be + as minimal as possible, and should only build a working basic + Busybox system for the target platform. You can of course use more + complicated configurations for your internal projects, but the + Buildroot project will only integrate basic board + configurations. This is because package selections are highly + application-specific.

+ +

Once you have a known working configuration, run make + savedefconfig. This will generate a + minimal defconfig file at the root of the Buildroot + source tree. Move this file into the configs/ + directory, and rename it MYBOARD_defconfig.

+ +

It is recommended to use as much as possible upstream versions + of the Linux kernel and bootloaders, and to use as much as + possible default kernel and bootloader configurations. If they are + incorrect for your platform, we encourage you to send fixes to the + corresponding upstream projects.

+ +

However, in the mean time, you may want to store kernel or + bootloader configuration or patches specific to your target + platform. To do so, create a + directory board/MANUFACTURER and a + subdirectory board/MANUFACTURER/BOARDNAME (after + replacing, of course, MANUFACTURER and BOARDNAME with the + appropriate values, in lower case letters). You can then store + your patches and configurations in these directories, and + reference them from the main Buildroot configuration.

Using the generated toolchain outside Buildroot

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