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.. SPDX-License-Identifier: GPL-2.0+
.. sectionauthor:: Kaustabh Chakraborty <kauschluss@disroot.org>
Samsung Exynos Generic ARMv8 Boards (for mobile devices)
========================================================
Overview
--------
This document describes how to build and run U-Boot for Samsung Exynos generic
boards. Boards are expected to boot with a primary bootloader, such as S-BOOT or
S-LK, which hands off control to U-Boot. Presently, only ARMv8 devices are
supported.
The U-Boot image is built with all device tree blobs packed in a single FIT
image. During boot, it uses simple heuristics to detect the target board, and
subsequently the appropriate FDT is selected.
Installation
------------
Building
^^^^^^^^
If a cross-compiler is required, install it and set it up like so:
.. prompt:: bash $
export CROSS_COMPILE=aarch64-linux-gnu-
Then, run the following commands to build U-Boot (replace ``<dtb>`` with the
upstream DTB path for the target device):
.. prompt:: bash $
make O=.output exynos-mobile_defconfig
make DEVICE_TREE=<dtb> O=.output -j$(nproc)
If successful, the U-Boot binary will be present in ``.output/u-boot.bin``.
Preparation and Flashing
^^^^^^^^^^^^^^^^^^^^^^^^
Since U-Boot supports multiple boards, and devices have different requirements,
this step will vary depending on your target.
.. toctree::
:maxdepth: 1
exynos-mobile/exynos7870
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