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Bin Meng 8853758268 docs: platform: Update descriptions for qemu/sifive_u support

With QEMU v4.2 release that has improved the emulation fidelity
of 'sifive_u' machine, OpenSBI v0.4 / U-Boot v2019.10-rc1 / Linux
kernel v5.3-rc2 images built for the SiFive HiFive Unleashed board
can be used out of the box without any special hack.

Update our documents to mention 'qemu/sifive_u' platform should
only be used with QEMU v4.1 or before, and it will be dropped
sometime in the future release.

Going forward, 'sifive/fu540' platform can be used on both real
hardware and QEMU v4.2+ 'sifive_u' machine.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

2019-09-25 10:34:54 +05:30

1.7 KiB

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QEMU SiFive Unleashed Machine Platform

The QEMU SiFive Unleashed Machine is an emulation of the SiFive Unleashed platform.

To build this platform specific library and firmwares, provide the PLATFORM=qemu/sifive_u parameter to the top level make command line.

Note with QEMU v4.2 release, the QEMU sifive_u machine has been updated to closely match the SiFive HiFive Unleashed hardware and can therefore run the same firmware as what gets loaded onto the board, and OpenSBI's qemu/sifive_u platform should only be used with QEMU v4.1 release or before.

The special qemu/sifive_u platform support will be dropped in the future OpenSBI release.

Platform Options

The QEMU SiFive Unleashed Machine platform does not have any platform specific options.

Executing on QEMU RISC-V 64-bit

No Payload Case

Build:

make PLATFORM=qemu/sifive_u

Run:

qemu-system-riscv64 -M sifive_u -m 256M -display none -serial stdio \
	-kernel build/platform/qemu/sifive_u/firmware/fw_payload.elf

U-Boot as a Payload

Note: the command line examples here assume that U-Boot was compiled using the sifive_fu540_defconfig configuration.