7 For building U-Boot you need a GCC compiler for your host platform. If you
8 are not building on the target platform you further need a GCC cross compiler.
13 On Debian based systems the cross compiler packages are named
14 gcc-<architecture>-linux-gnu.
16 You could install GCC and the GCC cross compiler for the ARMv8 architecture with
20 sudo apt-get gcc gcc-aarch64-linux-gnu
22 Depending on the build targets further packages maybe needed
26 sudo apt-get install bc bison build-essential coccinelle \
27 device-tree-compiler dfu-util efitools flex gdisk liblz4-tool \
28 libguestfs-tools libncurses-dev libpython3-dev libsdl2-dev libssl-dev \
29 lzma-alone openssl python3 python3-coverage python3-pyelftools \
30 python3-pytest python3-sphinxcontrib.apidoc python3-sphinx-rtd-theme swig
35 For some boards you have to build prerequisite files before you can build
36 U-Boot, e.g. for the some boards you will need to build the ARM Trusted Firmware
37 beforehand. Please, refer to the board specific documentation
38 :doc:`../board/index`.
43 Directory configs/ contains the template configuration files for the maintained
44 boards following the naming scheme::
46 <board name>_defconfig
48 These files have been stripped of default settings. So you cannot use them
49 directly. Instead their name serves as a make target to generate the actual
50 configuration file .config. For instance the configuration template for the
51 Odroid C2 board is called odroid-c2_defconfig. The corresponding .config file
56 make odroid-c2_defconfig
58 You can adjust the configuration using
67 When cross compiling you will have to specify the prefix of the cross-compiler.
68 You can either specify the value of the CROSS_COMPILE variable on the make
69 command line or export it beforehand.
73 CROSS_COMPILE=<compiler-prefix> make
75 Assuming cross compiling on Debian for ARMv8 this would be
79 CROSS_COMPILE=aarch64-linux-gnu- make
84 A list of available parameters for the make command can be obtained via
90 You can speed up compilation by parallelization using the -j parameter, e.g.
94 CROSS_COMPILE=aarch64-linux-gnu- make -j$(nproc)
96 Further important build parameters are
98 * O=<dir> - generate all output files in directory <dir>, including .config
104 A list of all make targets can be obtained via
112 * clean - remove most generated files but keep the configuration
113 * mrproper - remove all generated files + config + various backup files
118 The process for installing U-Boot on the target device is device specific.
119 Please, refer to the board specific documentation :doc:`../board/index`.