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.. SPDX-License-Identifier: GPL-2.0+
.. sectionauthor:: Sumit Garg <sumit.garg@linaro.org>
QCS404 EVB
==========
About this
----------
This document describes the information about Qualcomm QCS404 evaluation board
and it's usage steps.
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 qcs404evb_defconfig
$ make
This will build ``u-boot.bin`` in the configured output directory.
Generate FIT image
^^^^^^^^^^^^^^^^^^
A ``qcs404.its`` file can be found in ``board/qualcomm/qcs404-evb/`` directory.
It expects a folder as ``qcs404_imgs/`` in the main directory containing
pre-built kernel, dts and ramdisk images. See ``qcs404.its`` for full path to
images.
- Build FIT image::
mkimage -f qcs404-evb.its qcs404-evb.itb
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/;
/ {
model = "Qualcomm Technologies, Inc. QCS404 EVB 4000";
compatible = "qcom,qcs404-evb-4000", "qcom,qcs404-evb", "qcom,qcs404";
#address-cells = <2>;
#size-cells = <2>;
memory@80000000 {
device_type = "memory";
/* We expect the bootloader to fill in the size */
reg = <0 0x80000000 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 --kernel u-boot.bin.gz-dtb \
--ramdisk qcs404-evb.itb --pagesize 4096 \
--base 0x80000000 --output boot.img
Flash image on qcs404-evb using fastboot method.
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