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+.. SPDX-License-Identifier: GPL-2.0+
+.. sectionauthor:: Dzmitry Sankouski <dsankouski@gmail.com>
+
+Qualcomm generic boards
+=======================
+
+About this
+----------
+This document describes how to build and run U-Boot for Qualcomm generic
+boards. Right now the generic target supports the Snapdragon 845 SoC, however
+it's expected to support more SoCs going forward.
+
+SDM845 - high-end qualcomm chip, introduced in late 2017.
+Mostly used in flagship phones and tablets of 2018.
+
+The current boot flow support loading u-boot as an Android boot image via
+Qualcomm's UEFI-based ABL (Android) Bootloader. The DTB used by U-Boot will
+be appended to the U-Boot image the same way as when booting Linux. U-Boot
+will then retrieve the DTB during init. This way the memory layout and KASLR
+offset will be populated by ABL.
+
+Installation
+------------
+Build
+^^^^^
+
+	$ ./tools/buildman/buildman -o .output qcom
+
+This will build ``.output/u-boot-nodtb.bin`` using the ``qcom_defconfig``.
+
+Generate FIT image (optional)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+See doc/uImage.FIT for more details
+
+Pack android boot image
+^^^^^^^^^^^^^^^^^^^^^^^
+We'll assemble android boot image with ``u-boot-nodtb.bin`` instead of linux kernel,
+and FIT image instead of ``initramfs``. Android bootloader expect gzipped kernel
+with appended dtb, so let's mimic linux to satisfy stock bootloader.
+
+Boards
+------
+
+starqlte
+^^^^^^^^
+
+The starqltechn is a production board for Samsung S9 (SM-G9600) phone,
+based on the Qualcomm SDM845 SoC.
+
+This device is supported by the common qcom_defconfig.
+
+The DTB is called "sdm845-samsung-starqltechn.dtb"
+
+More information can be found on the `Samsung S9 page`_.
+
+dragonboard845c
+^^^^^^^^^^^^^^^
+
+The dragonboard845c is a Qualcomm Robotics RB3 Development Platform, based on
+the Qualcomm SDM845 SoC.
+
+This device is supported by the common qcom_defconfig
+
+The DTB is called "sdm845-db845c.dtb"
+
+More information can be found on the `DragonBoard 845c page`_.
+
+qcs404-evb
+^^^^^^^^^^
+
+The QCS404 EvB is a Qualcomm Development Platform, based on the Qualcomm QCS404 SoC.
+
+This device is supported by the common qcom_defconfig
+
+The DTB is called "qcs404-evb-4000.dtb"
+
+Building steps
+--------------
+
+Steps:
+
+- Build u-boot
+
+As above::
+
+	./tools/buildman/buildman -o .output qcom
+
+Or for db410c (and other boards not supported by the generic target)::
+
+	make CROSS_COMPILE=aarch64-linux-gnu- O=.output dragonboard410c_defconfig
+	make O=.output -j$(nproc)
+
+- gzip u-boot::
+
+	gzip u-boot-nodtb.bin
+
+- Append dtb to gzipped u-boot::
+
+	cat u-boot-nodtb.bin.gz arch/arm/dts/your-board.dtb > u-boot-nodtb.bin.gz-dtb
+
+- If you chose to build a FIT image, A ``qcom.its`` file can be found in ``board/qualcomm/generic/``
+  directory. It expects a folder as ``qcom_imgs/`` in the main directory containing pre-built kernel,
+  dts and ramdisk images. See ``qcom.its`` for full path to images::
+
+	mkimage -f qcom.its qcom.itb
+
+- Now we've got everything to build android boot image::
+
+	mkbootimg --kernel u-boot-nodtb.bin.gz-dtb --ramdisk db845c.itb \
+	--output boot.img --pagesize 4096 --base 0x80000000
+
+Or with no FIT image::
+
+	mkbootimg --kernel u-boot-nodtb.bin.gz-dtb \
+	--output boot.img --pagesize 4096 --base 0x80000000
+
+- Flash boot.img using fastboot and erase dtbo to avoid conflicts with our DTB:
+
+  .. code-block:: bash
+
+	fastboot flash boot boot.img
+	fastboot erase dtbo
+
+.. _Samsung S9 page: https://en.wikipedia.org/wiki/Samsung_Galaxy_S9
+.. _DragonBoard 845c page: https://www.96boards.org/product/rb3-platform/