mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-24 12:03:39 +00:00
510e379c49
This adds QEMU RISC-V 'virt' board target support, with the hope of helping people easily test U-Boot on RISC-V. The QEMU virt machine models a generic RISC-V virtual machine with support for the VirtIO standard networking and block storage devices. It has CLINT, PLIC, 16550A UART devices in addition to VirtIO and it also uses device-tree to pass configuration information to guest software. It implements RISC-V privileged architecture spec v1.10. Both 32-bit and 64-bit builds are supported. Support is pretty much preliminary, only booting to U-Boot shell with the UART driver on a single core. Booting Linux is not supported yet. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
46 lines
1.5 KiB
Text
46 lines
1.5 KiB
Text
# SPDX-License-Identifier: GPL-2.0+
|
|
#
|
|
# Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
|
|
|
|
U-Boot on QEMU's 'virt' machine on RISC-V
|
|
=========================================
|
|
|
|
QEMU for RISC-V supports a special 'virt' machine designed for emulation and
|
|
virtualization purposes. This document describes how to run U-Boot under it.
|
|
Both 32-bit 64-bit targets are supported.
|
|
|
|
The QEMU virt machine models a generic RISC-V virtual machine with support for
|
|
the VirtIO standard networking and block storage devices. It has CLINT, PLIC,
|
|
16550A UART devices in addition to VirtIO and it also uses device-tree to pass
|
|
configuration information to guest software. It implements RISC-V privileged
|
|
architecture spec v1.10.
|
|
|
|
Building U-Boot
|
|
---------------
|
|
Set the CROSS_COMPILE environment variable as usual, and run:
|
|
|
|
- For 32-bit RISC-V:
|
|
make qemu-riscv32_defconfig
|
|
make
|
|
|
|
- For 64-bit RISC-V:
|
|
make qemu-riscv64_defconfig
|
|
make
|
|
|
|
Running U-Boot
|
|
--------------
|
|
The minimal QEMU command line to get U-Boot up and running is:
|
|
|
|
- For 32-bit RISC-V:
|
|
qemu-system-riscv32 -nographic -machine virt -kernel u-boot
|
|
|
|
- For 64-bit RISC-V:
|
|
qemu-system-riscv64 -nographic -machine virt -kernel u-boot
|
|
|
|
The commands above create targets with 128MiB memory by default.
|
|
A freely configurable amount of RAM can be created via the '-m'
|
|
parameter. For example, '-m 2G' creates 2GiB memory for the target,
|
|
and the memory node in the embedded DTB created by QEMU reflects
|
|
the new setting.
|
|
|
|
These have been tested in QEMU 3.0.0.
|