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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>
47 lines
1.5 KiB
Plaintext
47 lines
1.5 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0+
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#
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# Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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U-Boot on QEMU's 'virt' machine on RISC-V
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=========================================
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QEMU for RISC-V supports a special 'virt' machine designed for emulation and
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virtualization purposes. This document describes how to run U-Boot under it.
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Both 32-bit 64-bit targets are supported.
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The QEMU virt machine models a generic RISC-V virtual machine with support for
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the VirtIO standard networking and block storage devices. It has CLINT, PLIC,
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16550A UART devices in addition to VirtIO and it also uses device-tree to pass
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configuration information to guest software. It implements RISC-V privileged
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architecture spec v1.10.
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Building U-Boot
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---------------
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Set the CROSS_COMPILE environment variable as usual, and run:
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- For 32-bit RISC-V:
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make qemu-riscv32_defconfig
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make
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- For 64-bit RISC-V:
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make qemu-riscv64_defconfig
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make
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Running U-Boot
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--------------
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The minimal QEMU command line to get U-Boot up and running is:
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- For 32-bit RISC-V:
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qemu-system-riscv32 -nographic -machine virt -kernel u-boot
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- For 64-bit RISC-V:
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qemu-system-riscv64 -nographic -machine virt -kernel u-boot
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The commands above create targets with 128MiB memory by default.
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A freely configurable amount of RAM can be created via the '-m'
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parameter. For example, '-m 2G' creates 2GiB memory for the target,
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and the memory node in the embedded DTB created by QEMU reflects
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the new setting.
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These have been tested in QEMU 3.0.0.
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