mirror of
https://github.com/AsahiLinux/u-boot
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94 lines
4.1 KiB
ReStructuredText
94 lines
4.1 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0+
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Pre-Generated FIP file set
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==========================
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The Amlogic ARMv8 based SoCs uses a vendor variant of the Trusted Firmware-A
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boot architecture.
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You can find documentation on the Trusted Firmware-A architecture on: https://www.trustedfirmware.org/projects/tf-a/
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The Trusted Firmware-A uses the following boot elements (simplified):
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- BL1: First boot step, implemented in ROM on Amlogic SoCs
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- BL2: Second boot step, used to initialize the SoC main clocks & DDR interface. The BL21 and ACS board-specific binaries are "inserted" in the BL32 binary before signing/packaging in order to be flashed on the platform.
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- BL30: Amlogic Secure Co-Processor (SCP) firmware used to handle all the system management operations (DVFS, suspend/resume, ...)
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- BL301: Amlogic Secure Co-Processor (SCP) board-specific firmware "plug-in" to handle custom DVFS & suspend-resume parameters
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- BL31: Initializes the interrupt controller and the system management interface (PSCI)
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- BL32 (Optional): Is the Trusted Environment Execution (TEE) Operating System to run secure Trusted Apps, e.g. OP-TEE
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- BL33: Is the last non-secure step, usually U-Boot which loads Linux
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Amlogic provides in binary form:
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- bl2.bin
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- bl30.bin
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- bl30.bin
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- bl31.img
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- bl32.bin
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And for lastest SoCs, Amlogic also provides the DDR drivers used by the BL2 binary.
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The licence of these files wasn't clear until recently, the currently Amlogic distribution licence
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is the following:
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.. code-block:: C
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// Copyright (C) 2018 Amlogic, Inc. All rights reserved.
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//
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// All information contained herein is Amlogic confidential.
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//
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// This software is provided to you pursuant to Software License
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// Agreement (SLA) with Amlogic Inc ("Amlogic"). This software may be
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// used only in accordance with the terms of this agreement.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification is strictly prohibited without prior written permission
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// from Amlogic.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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The following files are generated from the Amlogic U-Boot fork:
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- acs.bin: contains the PLL & DDR parameters for the board
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- bl301.bin: contains the DVFS & suspend-resume handling code for the board
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- bl33.bin: U-boot binary image
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The acs.bin & bl301.bin uses the U-Boot GPL-2.0+ headers & build systems, thus those
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are considered issued from GPL-2.0+ source code.
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The tools used to sign & package those binary files are delivered in binary format
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for Intel x86-64 and Python 2.x only.
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A collection of pre-built with the corresponding Amlogic binaries for the common
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commercially available boards were collected in the https://github.com/LibreELEC/amlogic-boot-fip
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repository.
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Using this collection for a commercially available board is very easy.
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Here considering the Libre Computer AML-S905X-CC, which codename is `lepotato`:
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.. code-block:: bash
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$ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1
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$ cd amlogic-boot-fip
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$ mkdir my-output-dir
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$ ./build-fip.sh lepotato /path/to/u-boot/u-boot.bin my-output-dir
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and then write the image to SD with:
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.. code-block:: bash
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$ DEV=/dev/your_sd_device
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$ dd if=my-output-dir/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
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$ dd if=my-output-dir/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=444
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