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.. SPDX-License-Identifier: GPL-2.0+
.. sectionauthor:: Dzmitry Sankouski <dsankouski@gmail.com>
Snapdragon 845
================
About this
----------
This document describes the information about Qualcomm Snapdragon 845
supported boards and it's usage steps.
SDM845 - hi-end qualcomm chip, introduced in late 2017.
Mostly used in flagship phones and tablets of 2018.
U-Boot can be used as a replacement for Qualcomm's original ABL (UEFI) bootloader.
It is loaded as an Android boot image through ABL
Installation
------------
Build
^^^^^
Setup ``CROSS_COMPILE`` for aarch64 and build U-Boot for your board::
$ export CROSS_COMPILE=<aarch64 toolchain prefix>
$ make <your board name here, see Boards section>_defconfig
$ make
This will build ``u-boot.bin`` in the configured output directory.
Generate FIT image
^^^^^^^^^^^^^^^^^^
See doc/uImage.FIT for more details
Pack android boot image
^^^^^^^^^^^^^^^^^^^^^^^
We'll assemble android boot image with ``u-boot.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:
- create dump dtb::
workdir=/tmp/prepare_payload
mkdir -p "$workdir"
cd "$workdir"
mock_dtb="$workdir"/payload_mock.dtb
dtc -I dts -O dtb -o "$mock_dtb" << EOF
/dts-v1/;
/ {
memory {
/* We expect the bootloader to fill in the size */
reg = <0 0 0 0>;
};
chosen { };
};
EOF
- gzip u-boot ``gzip u-boot.bin``
- append dtb to gzipped u-boot: ``cat u-boot.bin.gz "$mock_dtb" > u-boot.bin.gz-dtb``
Now we've got everything to build android boot image:::
mkbootimg --base 0x0 --kernel_offset 0x00008000 \
--ramdisk_offset 0x02000000 --tags_offset 0x01e00000 \
--pagesize 4096 --second_offset 0x00f00000 \
--ramdisk "$fit_image" \
--kernel u-boot.bin.gz-dtb \
-o boot.img
Flash image with your phone's flashing method.
Boards
------------
starqlte
^^^^^^^^^^^^
The starqltechn is a production board for Samsung S9 (SM-G9600) phone,
based on the Qualcomm SDM845 SoC.
More information can be found on the `Samsung S9 page`_.
.. _Samsung S9 page: https://en.wikipedia.org/wiki/Samsung_Galaxy_S9
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