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doc: qemu-riscv: Update documentation for QEMU spike machine

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We can now use same U-Boot images on both QEMU virt machine and QEMU
spike machine so let's update the QEMU RISC-V documentation.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Anup Patel 2022-01-27 11:41:10 +05:30 committed by Leo Yu-Chi Liang
parent ef19131b80
commit 7c08680aa3
1 changed files with 32 additions and 16 deletions
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48
doc/board/emulation/qemu-riscv.rst
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@ -4,19 +4,24 @@
QEMU 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 and 64-bit targets are supported, running in either machine or
supervisor mode.
QEMU for RISC-V supports a special 'virt' machine and 'spike' machine designed
for emulation and virtualization purposes. This document describes how to run
U-Boot under it. Both 32-bit and 64-bit targets are supported, running in
either machine or supervisor mode.
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
configuration information to guest software. It implements the latest RISC-V
privileged architecture.
See :doc:`../../develop/devicetree/dt_qemu` for information on how to see
the devicetree actually generated by QEMU.
architecture spec v1.10.
The QEMU spike machine models a minimalistic RISC-V virtual machine with
only CLINT and HTIF devices. It also uses device-tree to pass configuration
information to guest software and implements the latest RISC-V privileged
architecture.
Building U-Boot
---------------
@ -41,13 +46,17 @@ Running U-Boot
--------------
The minimal QEMU command line to get U-Boot up and running is:
- For 32-bit RISC-V::
- For 32-bit RISC-V virt machine::
qemu-system-riscv32 -nographic -machine virt -bios u-boot
qemu-system-riscv32 -nographic -machine virt -bios u-boot.bin
- For 64-bit RISC-V::
- For 64-bit RISC-V virt machine::
qemu-system-riscv64 -nographic -machine virt -bios u-boot
qemu-system-riscv64 -nographic -machine virt -bios u-boot.bin
- For 64-bit RISC-V spike machine::
qemu-system-riscv64 -nographic -machine spike -bios u-boot.bin
The commands above create targets with 128MiB memory by default.
A freely configurable amount of RAM can be created via the '-m'
@ -58,6 +67,7 @@ the new setting.
For instructions on how to run U-Boot in supervisor mode on QEMU
with OpenSBI, see the documentation available with OpenSBI:
https://github.com/riscv/opensbi/blob/master/docs/platform/qemu_virt.md
https://github.com/riscv/opensbi/blob/master/docs/platform/spike.md
These have been tested in QEMU 5.0.0.
@ -80,8 +90,9 @@ supported by U-Boot. Clone the OpenSBI repository and run the following command.
See the OpenSBI documentation for full details:
https://github.com/riscv/opensbi/blob/master/docs/platform/qemu_virt.md
https://github.com/riscv/opensbi/blob/master/docs/platform/spike.md
To make the FW_DYNAMIC binary (build/platform/qemu/virt/firmware/fw_dynamic.bin)
To make the FW_DYNAMIC binary (build/platform/generic/firmware/fw_dynamic.bin)
available to U-Boot, either copy it into the U-Boot root directory or specify
its location with the OPENSBI environment variable. Afterwards, compile U-Boot
with the following commands.
@ -99,17 +110,22 @@ with the following commands.
The minimal QEMU commands to run U-Boot SPL in both 32-bit and 64-bit
configurations are:
- For 32-bit RISC-V::
- For 32-bit RISC-V virt machine::
qemu-system-riscv32 -nographic -machine virt -bios spl/u-boot-spl \
qemu-system-riscv32 -nographic -machine virt -bios spl/u-boot-spl.bin \
-device loader,file=u-boot.itb,addr=0x80200000
- For 64-bit RISC-V::
- For 64-bit RISC-V virt machine::
qemu-system-riscv64 -nographic -machine virt -bios spl/u-boot-spl \
qemu-system-riscv64 -nographic -machine virt -bios spl/u-boot-spl.bin \
-device loader,file=u-boot.itb,addr=0x80200000
An attached disk can be emulated by adding::
- For 64-bit RISC-V spike machine::
qemu-system-riscv64 -nographic -machine spike -bios spl/u-boot-spl.bin \
-device loader,file=u-boot.itb,addr=0x80200000
An attached disk can be emulated in RISC-V virt machine by adding::
-device ich9-ahci,id=ahci \
-drive if=none,file=riscv64.img,format=raw,id=mydisk \