mirror of
https://github.com/smaeul/u-boot.git
synced 2025-10-31 12:08:19 +00:00
bd00ef74f3
Signed-off-by: Milan P. Stanić <mps@arvanta.net> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
198 lines
5.6 KiB
ReStructuredText
198 lines
5.6 KiB
ReStructuredText
Building with GCC
|
|
=================
|
|
|
|
Dependencies
|
|
------------
|
|
|
|
For building U-Boot you need a GCC compiler for your host platform. If you
|
|
are not building on the target platform you further need a GCC cross compiler.
|
|
|
|
Debian based
|
|
~~~~~~~~~~~~
|
|
|
|
On Debian based systems the cross compiler packages are named
|
|
gcc-<architecture>-linux-gnu.
|
|
|
|
You could install GCC and the GCC cross compiler for the ARMv8 architecture with
|
|
|
|
.. code-block:: bash
|
|
|
|
sudo apt-get install gcc gcc-aarch64-linux-gnu
|
|
|
|
Depending on the build targets further packages maybe needed
|
|
|
|
.. code-block:: bash
|
|
|
|
sudo apt-get install bc bison build-essential coccinelle \
|
|
device-tree-compiler dfu-util efitools flex gdisk graphviz imagemagick \
|
|
liblz4-tool libgnutls28-dev libguestfs-tools libncurses-dev \
|
|
libpython3-dev libsdl2-dev libssl-dev lz4 lzma lzma-alone openssl \
|
|
pkg-config python3 python3-asteval python3-coverage python3-filelock \
|
|
python3-pkg-resources python3-pycryptodome python3-pyelftools \
|
|
python3-pytest python3-pytest-xdist python3-sphinxcontrib.apidoc \
|
|
python3-sphinx-rtd-theme python3-subunit python3-testtools \
|
|
python3-virtualenv swig uuid-dev
|
|
|
|
SUSE based
|
|
~~~~~~~~~~
|
|
|
|
On suse based systems the cross compiler packages are named
|
|
cross-<architecture>-gcc<version>.
|
|
|
|
You could install GCC and the GCC 10 cross compiler for the ARMv8 architecture
|
|
with
|
|
|
|
.. code-block:: bash
|
|
|
|
sudo zypper install gcc cross-aarch64-gcc10
|
|
|
|
Depending on the build targets further packages maybe needed.
|
|
|
|
.. code-block:: bash
|
|
|
|
zypper install bc bison flex gcc libopenssl-devel libSDL2-devel make \
|
|
ncurses-devel python3-devel python3-pytest swig
|
|
|
|
Alpine Linux
|
|
~~~~~~~~~~~~
|
|
|
|
For building U-Boot on Alpine Linux at least the following packages are needed:
|
|
|
|
.. code-block:: bash
|
|
|
|
apk add alpine-sdk bc bison dtc flex gnutls-dev linux-headers ncurses-dev \
|
|
openssl-dev py3-elftools py3-setuptools python3-dev swig util-linux-dev
|
|
|
|
Depending on the build target further packages may be needed:
|
|
|
|
* sandbox with lcd: sdl2-dev
|
|
* riscv64 S-mode targets: opensbi
|
|
* some arm64 targets: arm-trusted-firmware
|
|
|
|
Prerequisites
|
|
-------------
|
|
|
|
For some boards you have to build prerequisite files before you can build
|
|
U-Boot, e.g. for the some boards you will need to build the ARM Trusted Firmware
|
|
beforehand. Please, refer to the board specific documentation
|
|
:doc:`../board/index`.
|
|
|
|
Configuration
|
|
-------------
|
|
|
|
Directory configs/ contains the template configuration files for the maintained
|
|
boards following the naming scheme::
|
|
|
|
<board name>_defconfig
|
|
|
|
These files have been stripped of default settings. So you cannot use them
|
|
directly. Instead their name serves as a make target to generate the actual
|
|
configuration file .config. For instance the configuration template for the
|
|
Odroid C2 board is called odroid-c2_defconfig. The corresponding .config file
|
|
is generated by
|
|
|
|
.. code-block:: bash
|
|
|
|
make odroid-c2_defconfig
|
|
|
|
You can adjust the configuration using
|
|
|
|
.. code-block:: bash
|
|
|
|
make menuconfig
|
|
|
|
Building
|
|
--------
|
|
|
|
When cross compiling you will have to specify the prefix of the cross-compiler.
|
|
You can either specify the value of the CROSS_COMPILE variable on the make
|
|
command line or export it beforehand.
|
|
|
|
.. code-block:: bash
|
|
|
|
CROSS_COMPILE=<compiler-prefix> make
|
|
|
|
Assuming cross compiling on Debian for ARMv8 this would be
|
|
|
|
.. code-block:: bash
|
|
|
|
CROSS_COMPILE=aarch64-linux-gnu- make
|
|
|
|
Build parameters
|
|
~~~~~~~~~~~~~~~~
|
|
|
|
A list of available parameters for the make command can be obtained via
|
|
|
|
.. code-block:: bash
|
|
|
|
make help
|
|
|
|
You can speed up compilation by parallelization using the -j parameter, e.g.
|
|
|
|
.. code-block:: bash
|
|
|
|
CROSS_COMPILE=aarch64-linux-gnu- make -j$(nproc)
|
|
|
|
Further important build parameters are
|
|
|
|
* O=<dir> - generate all output files in directory <dir>, including .config
|
|
* V=1 - verbose build
|
|
|
|
Devicetree compiler
|
|
~~~~~~~~~~~~~~~~~~~
|
|
|
|
Boards that use `CONFIG_OF_CONTROL` (i.e. almost all of them) need the
|
|
devicetree compiler (dtc). Those with `CONFIG_PYLIBFDT` need pylibfdt, a Python
|
|
library for accessing devicetree data. Suitable versions of these are included
|
|
in the U-Boot tree in `scripts/dtc` and built automatically as needed.
|
|
|
|
To use the system versions of these, use the DTC parameter, for example
|
|
|
|
.. code-block:: bash
|
|
|
|
DTC=/usr/bin/dtc make
|
|
|
|
In this case, dtc and pylibfdt are not built. The build checks that the version
|
|
of dtc is new enough. It also makes sure that pylibfdt is present, if needed
|
|
(see `scripts_dtc` in the Makefile).
|
|
|
|
Note that the :doc:`tools` are always built with the included version of libfdt
|
|
so it is not possible to build U-Boot tools with a system libfdt, at present.
|
|
|
|
Link-time optimisation (LTO)
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
U-Boot supports link-time optimisation which can reduce the size of the final
|
|
U-Boot binaries, particularly with SPL.
|
|
|
|
At present this can be enabled by ARM boards by adding `CONFIG_LTO=y` into the
|
|
defconfig file. Other architectures are not supported. LTO is enabled by default
|
|
for sandbox.
|
|
|
|
This does incur a link-time penalty of several seconds. For faster incremental
|
|
builds during development, you can disable it by setting `NO_LTO` to `1`.
|
|
|
|
.. code-block:: bash
|
|
|
|
NO_LTO=1 make
|
|
|
|
Other build targets
|
|
~~~~~~~~~~~~~~~~~~~
|
|
|
|
A list of all make targets can be obtained via
|
|
|
|
.. code-block:: bash
|
|
|
|
make help
|
|
|
|
Important ones are
|
|
|
|
* clean - remove most generated files but keep the configuration
|
|
* mrproper - remove all generated files + config + various backup files
|
|
|
|
Installation
|
|
------------
|
|
|
|
The process for installing U-Boot on the target device is device specific.
|
|
Please, refer to the board specific documentation :doc:`../board/index`.
|