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https://github.com/AsahiLinux/u-boot
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80 lines
2.1 KiB
ReStructuredText
80 lines
2.1 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0+
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.. sectionauthor:: Sumit Garg <sumit.garg@linaro.org>
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QCS404 EVB
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==========
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About this
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----------
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This document describes the information about Qualcomm QCS404 evaluation board
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and it's usage steps.
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U-Boot can be used as a replacement for Qualcomm's original ABL (UEFI) bootloader.
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It is loaded as an Android boot image through ABL
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Installation
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------------
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Build
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^^^^^
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Setup ``CROSS_COMPILE`` for aarch64 and build U-Boot for your board::
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$ export CROSS_COMPILE=<aarch64 toolchain prefix>
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$ make qcs404evb_defconfig
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$ make
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This will build ``u-boot.bin`` in the configured output directory.
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Generate FIT image
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^^^^^^^^^^^^^^^^^^
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A ``qcs404.its`` file can be found in ``board/qualcomm/qcs404-evb/`` directory.
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It expects a folder as ``qcs404_imgs/`` in the main directory containing
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pre-built kernel, dts and ramdisk images. See ``qcs404.its`` for full path to
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images.
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- Build FIT image::
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mkimage -f qcs404-evb.its qcs404-evb.itb
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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.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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- create dump dtb::
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workdir=/tmp/prepare_payload
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mkdir -p "$workdir"
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cd "$workdir"
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mock_dtb="$workdir"/payload_mock.dtb
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dtc -I dts -O dtb -o "$mock_dtb" << EOF
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/dts-v1/;
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/ {
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model = "Qualcomm Technologies, Inc. QCS404 EVB 4000";
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compatible = "qcom,qcs404-evb-4000", "qcom,qcs404-evb", "qcom,qcs404";
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#address-cells = <2>;
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#size-cells = <2>;
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memory@80000000 {
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device_type = "memory";
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/* We expect the bootloader to fill in the size */
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reg = <0 0x80000000 0 0>;
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};
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chosen { };
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};
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EOF
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- gzip u-boot ``gzip u-boot.bin``
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- append dtb to gzipped u-boot: ``cat u-boot.bin.gz "$mock_dtb" > u-boot.bin.gz-dtb``
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Now we've got everything to build android boot image:::
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mkbootimg --kernel u-boot.bin.gz-dtb \
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--ramdisk qcs404-evb.itb --pagesize 4096 \
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--base 0x80000000 --output boot.img
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Flash image on qcs404-evb using fastboot method.
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