buildroot

1
buildroot

• CS-423
• Dick Steflik

2
buildroot

• uClibc C library for developing for embedded
  Linux
• much smaller than GNU C
• tools to make a cross-compilation tool chain and
  root file system for embedded systems using the
  uClibc library
• buildroot and uClibc are developed and supported
  by Erik Anderson (codepoet.org)

3
Architectures Supported

• AVR32
• Power PC
• MIPS
• ARM
• i386
• Blackfin
• sparc
• alpha

4
Requirements

• Linux
• gcc g (for Qtopia)
• GNU make
• sed
• bison
• flex
• autoconf
• ncurses
• zlib
• libaci
• lzo

5
Steps

• Download/unpack buildroot from Atmel (AVR32)
• http//buildroot.uclibc.org (for other
  architectures)
• Atmel version includes setups for Atmel
  development boards and board specific setup.c
  files
• Make sure your system has the required software
  packages or youll end up starting over several
  time until everything is in place.

6
First time

• go to the buildroot directory
• make atngw100_defconfig this downloads the
  boards default configuration
• make source this will download the files, you
  should now have everything you need to build the
  default file systems (root and user)
• this step can take a couple of hours
• make this will start the build process and may
  take a more than an hour.

7
more.

• To change the configuration use make
  menuconfig
• this will present you with a text based menu
  system to modify the configuration files for the
  build
• name the project with something relavant
• upon exiting menuconfig your are ready to do a
  build
• after the build the file systems will be in
  binaries/project_name/

8
Directories (before build)

• Config.in/
• .defconfig/
• docs/
• Makefile
• package/
• target/
• TODO
• tool/chain

9
Directories (after build)

• 6 additional directories
• binaries/
• build_avr32_nopfu/
• include/
• project_build_avr32_nopfu/
• src/
• toolchain_build_avr32_nopfu/

10
Binaries

• atngw100-linux-kernel-version
• the linux kernel you just built, also included in
  the rootfs
• rootfs-avr32-jffs2-root
• rootfs targeted for jffs2 for flash (can also be
  targetted to ext2 for booting from MMC/SD card
• rootfs-avr32-jffs2-usr
• the user file system in jffs2 format for flash
• u-boot.bin
• u-boot binary, must be loaded via
  avr32programm/JTAGICE