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Pieter Smith 76165265af barebox: support auxiliary config build 
Adds support to build barebox with an auxiliary config.

This is useful for building an SPL (Secondary Program Loader) in
addition to the traditional TPL (Tertiary Program Loader). The
Beaglebone Black for example has two barebox configurations:

- am335x_defconfig builds the full barebox bootloader with device
  tree

- am335x_mlo_defconfig builds the smaller MLO bootloader that loads
  the full barebox bootloader from the eMMC or SD card.

Tested with the following defconfig:

  # architecture
  BR2_arm=y
  BR2_cortex_a8=y
  BR2_ARM_EABIHF=y

  # system
  BR2_TARGET_GENERIC_HOSTNAME="beaglebone"
  BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_DEVTMPFS=y
  BR2_TARGET_GENERIC_REMOUNT_ROOTFS_RW=y

  # filesystem
  BR2_PACKAGE_AM33X_CM3=y
  BR2_TARGET_ROOTFS_EXT2=y
  BR2_TARGET_ROOTFS_EXT2_4=y

  # bootloader
  BR2_TARGET_BAREBOX=y
  BR2_TARGET_BAREBOX_BOARD_DEFCONFIG="am335x"
  BR2_TARGET_BAREBOX_IMAGE_FILE="images/barebox-am33xx-beaglebone.img"
  BR2_TARGET_BAREBOX_CUSTOM_ENV=y
  BR2_TARGET_BAREBOX_CUSTOM_ENV_PATH="board/beaglebone/barebox/barebox.env"
  BR2_TARGET_BAREBOX_AUX=y
  BR2_TARGET_BAREBOX_AUX_BOARD_DEFCONFIG="am335x_mlo"
  BR2_TARGET_BAREBOX_AUX_IMAGE_FILE="images/barebox-am33xx-beaglebone-mlo.img"

  # kernel
  BR2_LINUX_KERNEL=y
  BR2_LINUX_KERNEL_USE_DEFCONFIG=y
  BR2_LINUX_KERNEL_DEFCONFIG="omap2plus"
  BR2_LINUX_KERNEL_ZIMAGE=y

  # use the barebox built-in dtb
  # BR2_LINUX_KERNEL_DTS_SUPPORT is not set

Signed-off-by: Pieter Smith <pieter@boesman.nl>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
2016-05-01 14:33:57 +02:00
arch toolchain: add coldfire support 2016-04-30 18:50:46 +02:00
board board: add qemu coldfire support 2016-04-30 18:50:46 +02:00
boot barebox: support auxiliary config build 2016-05-01 14:33:57 +02:00
configs board: add qemu coldfire support 2016-04-30 18:50:46 +02:00
docs Revert "core: add the possibility to provide help for custom rules" 2016-04-17 10:55:37 +02:00
fs fs/common: generate users before setting permissions 2016-02-01 07:25:36 +01:00
linux linux: properly install all images in the initramfs case 2016-04-25 21:40:47 +02:00
package webkitgtk24: mark as deprecated 2016-04-30 21:07:27 +02:00
support support/scripts/check-host-rpath: also check HOST_DIR/{bin, sbin} 2016-04-21 22:17:36 +02:00
system skeleton: Recreate /var/run symlink 2016-02-11 23:20:38 +01:00
toolchain toolchain-external: bump version of Linaro AArch64 toolchain 2016-04-30 21:10:36 +02:00
.defconfig arch/x86: remove support for i386 2016-04-18 23:38:34 +02:00
.gitignore update gitignore 2013-05-04 12:41:55 +02:00
CHANGES Update for 2016.02 2016-03-01 21:47:30 +01:00
Config.in Config.in: add symbols for BR2_HOST_GCC_AT_LEAST_4_6 2016-03-20 14:55:27 +01:00
Config.in.legacy arch/x86: remove support for i386 2016-04-18 23:38:34 +02:00
COPYING COPYING: add exception about patch licensing 2016-02-26 19:50:13 +01:00
Makefile purge-locales: Handle empty locale directories better 2016-04-28 23:48:09 +02:00
Makefile.legacy Makefile.legacy: fix recursive invocation with BUILDROOT_DL_DIR and _CONFIG 2014-02-11 08:14:57 +01:00
README README: add reference to submitting-patches 2016-02-01 19:16:08 +01:00

README 

Buildroot is a simple, efficient and easy-to-use tool to generate embedded
Linux systems through cross-compilation.

The documentation can be found in docs/manual. You can generate a text
document with 'make manual-text' and read output/docs/manual/manual.text.
Online documentation can be found at http://buildroot.org/docs.html

To build and use the buildroot stuff, do the following:

1) run 'make menuconfig'
2) select the target architecture and the packages you wish to compile
3) run 'make'
4) wait while it compiles
5) find the kernel, bootloader, root filesystem, etc. in output/images

You do not need to be root to build or run buildroot.  Have fun!

Buildroot comes with a basic configuration for a number of boards. Run
'make list-defconfigs' to view the list of provided configurations.

Please feed suggestions, bug reports, insults, and bribes back to the
buildroot mailing list: buildroot@buildroot.org
You can also find us on #buildroot on Freenode IRC.

If you would like to contribute patches, please read
https://buildroot.org/manual.html#submitting-patches