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.. SPDX-License-Identifier: GPL-2.0+
.. Copyright (C) 2024, Patrick Rudolph <patrick.rudolph@9elements.com>
QEMU ARM SBSA
=============
QEMU for ARM supports Arm Server Base System Architecture Reference board,
short 'sbsa-ref' that utilizes ACPI over FDT. This document describes how to run
U-Boot under it. Only AArch64 is supported.
The 'sbsa' platform provides the following as the basic functionality:
- A freely configurable amount of CPU cores
- U-Boot loaded and executing in the emulated flash at address 0x10000000
- No device tree blob
- A freely configurable amount of RAM
- A PL011 serial port
- An ARMv7/ARMv8 architected timer
- PSCI for rebooting the system
- A generic ECAM-based PCI host controller
Additionally, a number of optional peripherals can be added to the PCI bus.
Compile ARM Trusted Firmware (ATF)
----------------------------------
Get and Build the ARM Trusted firmware
--------------------------------------
Note: srctree is U-Boot source directory
Get ATF from: https://github.com/ARM-software/arm-trusted-firmware
.. code-block:: bash
git clone https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git tfa
cd tfa
make CROSS_COMPILE=aarch64-linux-gnu- all fip \
ARM_LINUX_KERNEL_AS_BL33=1 DEBUG=1 PLAT=qemu_sbsa
Copy the resulting FIP and BL1 binary
.. code-block:: bash
cp build/qemu_sbsa/debug/fip.bin ../
cp build/qemu_sbsa/debug/bl1.bin ../
Building U-Boot
---------------
Set the CROSS_COMPILE environment variable as usual, and run:
.. code-block:: bash
make qemu-arm-sbsa_defconfig
make
Running U-Boot
--------------
The minimal QEMU command line to get U-Boot up and running is:
.. code-block:: bash
qemu-system-aarch64 -machine sbsa-ref -nographic -cpu cortex-a57 \
-pflash secure-world.rom \
-pflash unsecure-world.rom
Note that for some odd reason qemu-system-aarch64 needs to be explicitly
told to use a 64-bit CPU or it will boot in 32-bit mode. The -nographic argument
ensures that output appears on the terminal. Use Ctrl-A X to quit.
Booting distros
---------------
It is possible to install and boot a standard Linux distribution using
sbsa by setting up a root disk::
.. code-block:: bash
qemu-img create root.img 20G
then using the installer to install. For example, with Debian 12::
.. code-block:: bash
qemu-system-aarch64 \
-machine sbsa-ref -cpu cortex-a57 -m 4G -smp 4 \
-pflash secure-world.rom \
-pflash unsecure-world.rom \
-device virtio-rng-pci \
-device usb-kbd -device usb-tablet \
-cdrom debian-12.0.0-arm64-netinst.iso \
-hda root.img
Debug UART
----------
The debug UART on the ARM sbsa board uses these settings::
CONFIG_DEBUG_UART=y
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