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- # 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.
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