Merge branch 'master' of https://source.denx.de/u-boot/custodians/u-boot-samsung

- Assorted updates

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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:
+ 
+ .. prompt:: bash $
+ 
+       make O=.output exynos-mobile_defconfig
+       make 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