03a76b1a73
In previous commit, incoming standard passage is used by default when initializing the bloblist, so explicitly BLOBLIST_PASSAGE is no more needed. Rename it as BLOBLIST_PASSAGE_MANDATORY to determine the behaviors when an incoming transfer list does not exist or is invalid. When it is selected, incoming standard passage is mandatory and U-Boot will report an error when a valid incoming transfer list is missing. Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
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2.4 KiB
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68 lines
2.4 KiB
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.. SPDX-License-Identifier: GPL-2.0
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Arm Versatile Express
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=====================
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The vexpress_* board configuration supports the following platforms:
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* FVP_Base_RevC-2xAEMvA
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* FVP_BaseR_AEMv8R
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* Juno development board
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Fixed Virtual Platforms
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-----------------------
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The Fixed Virtual Platforms (FVP) are complete simulations of an Arm system,
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including processor, memory and peripherals. They are set out in a "programmer's
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view", which gives a comprehensive model on which to build and test software.
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The supported FVPs are available free of charge and can be downloaded from the
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Arm developer site [1]_ (user registration might be required).
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Supported features:
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* GICv3
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* Generic timer
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* PL011 UART
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The default configuration assumes that U-Boot is bootstrapped using a suitable
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bootloader, such as Trusted Firmware-A [4]_. The u-boot binary can be passed
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into the TF-A build: ``make PLAT=<platform> all fip BL33=u-boot.bin``
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The FVPs can be debugged using Arm Development Studio [2]_.
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Juno
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----
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Juno is an Arm development board with the following features:
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* Arm Cortex-A72/A57 and Arm Cortex-A53 in a "big.LITTLE" configuration
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* A PCIe Gen2.0 bus with 4 lanes
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* 8GB of DRAM
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* GICv2
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More details can be found in the board documentation [3]_.
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Bloblist Support
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----------------
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The ``vexpress_fvp_bloblist_defconfig`` configures U-Boot to be compiled for
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Vexpress64 with Bloblist as the primary method for information handoff between
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boot stages. U-Boot offers three methods to set up a bloblist: using a
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predefined bloblist at a specified address, dynamically allocating memory for a
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bloblist, or utilizing a standard passage-provided bloblist with automatic size
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detection.
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By default, ``vexpress_fvp_bloblist_defconfig`` uses the standard passage method mandatorily
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(CONFIG_BLOBLIST_PASSAGE_MANDATORY) because TF-A provides a Transfer List in non-secure
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memory that U-Boot can utilise. This Bloblist, which is referred to as a Transfer List in
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TF-A, contains all necessary data for the handoff process, including DT and ACPI
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tables.
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References
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----------
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.. [1] https://developer.arm.com/tools-and-software/simulation-models/fixed-virtual-platforms
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.. [2] https://developer.arm.com/tools-and-software/embedded/arm-development-studio
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.. [3] https://developer.arm.com/tools-and-software/development-boards/juno-development-board
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.. [4] https://trustedfirmware-a.readthedocs.io/ |