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.. SPDX-License-Identifier: GPL-2.0+
Arm Versatile Express
=====================
The vexpress_* board configuration supports the following platforms:
* FVP_Base_RevC-2xAEMvA
* FVP_BaseR_AEMv8R
* Juno development board
Fixed Virtual Platforms
-----------------------
The Fixed Virtual Platforms (FVP) are complete simulations of an Arm system,
including processor, memory and peripherals. They are set out in a "programmer's
view", which gives a comprehensive model on which to build and test software.
The supported FVPs are available free of charge and can be downloaded from the
Arm developer site [1]_ (user registration might be required).
Supported features:
* GICv3
* Generic timer
* PL011 UART
* SMC91111 network interface
The default configuration assumes that U-Boot is boostrapped from the start of
the DRAM (address 0x80000000 for AEMvA; 0x00000000 for AEMv8R) using a suitable
bootloader. Alternatively, U-Boot can be launched directly by mapping the binary
to the same address (using the FVP's --data argument).
The FVPs can be debugged using Arm Development Studio [2]_.
FVP_BaseR
^^^^^^^^^
On Armv8r64 platforms (such as the FVP_BaseR), U-Boot runs at S-EL2, so
CONFIG_ARMV8_SWITCH_TO_EL1 is defined so that the next stage boots at S-EL1. If
S-EL2 is desired instead, the *armv8_switch_to_el1* environment variable is
available. This can be set to *n* to override the config flag and boot the next
stage at S-EL2 instead.
Juno
----
The Juno development board is an open, vendor-neutral Armv8-A development
platform that supports an out-of-the-box Linux software package. A range of
plug-in expansion options enables hardware and software applications to be
developed and debugged.
References
----------
.. [1] https://developer.arm.com/tools-and-software/simulation-models/fixed-virtual-platforms
.. [2] https://developer.arm.com/tools-and-software/embedded/arm-development-studio
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