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 buildroot and uClibc are developed and supported by Erik Anderson (codepoet.org)

Architectures Supported AVR32 Power PC MIPS ARM i386 Blackfin sparc alpha

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

Steps Download/unpack buildroot from Atmel (AVR32) – (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.

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.

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]/

Directories (before build) Config.in/.defconfig/ docs/ Makefile package/ target/ TODO tool/chain

Directories (after build) 6 additional directories –binaries/ –build_avr32_nopfu/ –include/ –project_build_avr32_nopfu/ –src/ –toolchain_build_avr32_nopfu/

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