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buildroot

buildroot. CS-423 Dick Steflik. 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

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buildroot

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  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 you’ll 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

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