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d9252fcde1
Replace the board specific docs with a generic board.rst file which documents the build/boot process for the sdm845 and qcs404 boards now that the only differences are the DTB in use. At the same time, create a debugging page to document some useful snippets and tips for working with Qualcomm platforms. Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
125 lines
3.4 KiB
ReStructuredText
125 lines
3.4 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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.. sectionauthor:: Dzmitry Sankouski <dsankouski@gmail.com>
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Qualcomm generic boards
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=======================
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About this
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----------
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This document describes how to build and run U-Boot for Qualcomm generic
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boards. Right now the generic target supports the Snapdragon 845 SoC, however
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it's expected to support more SoCs going forward.
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SDM845 - high-end qualcomm chip, introduced in late 2017.
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Mostly used in flagship phones and tablets of 2018.
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The current boot flow support loading u-boot as an Android boot image via
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Qualcomm's UEFI-based ABL (Android) Bootloader. The DTB used by U-Boot will
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be appended to the U-Boot image the same way as when booting Linux. U-Boot
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will then retrieve the DTB during init. This way the memory layout and KASLR
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offset will be populated by ABL.
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Installation
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------------
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Build
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^^^^^
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$ ./tools/buildman/buildman -o .output qcom
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This will build ``.output/u-boot-nodtb.bin`` using the ``qcom_defconfig``.
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Generate FIT image (optional)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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See doc/uImage.FIT for more details
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Pack android boot image
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^^^^^^^^^^^^^^^^^^^^^^^
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We'll assemble android boot image with ``u-boot-nodtb.bin`` instead of linux kernel,
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and FIT image instead of ``initramfs``. Android bootloader expect gzipped kernel
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with appended dtb, so let's mimic linux to satisfy stock bootloader.
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Boards
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------
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starqlte
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^^^^^^^^
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The starqltechn is a production board for Samsung S9 (SM-G9600) phone,
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based on the Qualcomm SDM845 SoC.
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This device is supported by the common qcom_defconfig.
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The DTB is called "sdm845-samsung-starqltechn.dtb"
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More information can be found on the `Samsung S9 page`_.
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dragonboard845c
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^^^^^^^^^^^^^^^
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The dragonboard845c is a Qualcomm Robotics RB3 Development Platform, based on
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the Qualcomm SDM845 SoC.
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This device is supported by the common qcom_defconfig
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The DTB is called "sdm845-db845c.dtb"
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More information can be found on the `DragonBoard 845c page`_.
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qcs404-evb
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^^^^^^^^^^
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The QCS404 EvB is a Qualcomm Development Platform, based on the Qualcomm QCS404 SoC.
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This device is supported by the common qcom_defconfig
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The DTB is called "qcs404-evb-4000.dtb"
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Building steps
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--------------
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Steps:
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- Build u-boot
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As above::
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./tools/buildman/buildman -o .output qcom
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Or for db410c (and other boards not supported by the generic target)::
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make CROSS_COMPILE=aarch64-linux-gnu- O=.output dragonboard410c_defconfig
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make O=.output -j$(nproc)
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- gzip u-boot::
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gzip u-boot-nodtb.bin
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- Append dtb to gzipped u-boot::
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cat u-boot-nodtb.bin.gz arch/arm/dts/your-board.dtb > u-boot-nodtb.bin.gz-dtb
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- If you chose to build a FIT image, A ``qcom.its`` file can be found in ``board/qualcomm/generic/``
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directory. It expects a folder as ``qcom_imgs/`` in the main directory containing pre-built kernel,
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dts and ramdisk images. See ``qcom.its`` for full path to images::
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mkimage -f qcom.its qcom.itb
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- Now we've got everything to build android boot image::
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mkbootimg --kernel u-boot-nodtb.bin.gz-dtb --ramdisk db845c.itb \
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--output boot.img --pagesize 4096 --base 0x80000000
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Or with no FIT image::
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mkbootimg --kernel u-boot-nodtb.bin.gz-dtb \
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--output boot.img --pagesize 4096 --base 0x80000000
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- Flash boot.img using fastboot and erase dtbo to avoid conflicts with our DTB:
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.. code-block:: bash
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fastboot flash boot boot.img
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fastboot erase dtbo
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.. _Samsung S9 page: https://en.wikipedia.org/wiki/Samsung_Galaxy_S9
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.. _DragonBoard 845c page: https://www.96boards.org/product/rb3-platform/
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