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opensbi/docs/platform/qemu_virt.md
Anup Patel d0bbbbb8fd docs: Add documenation for QEMU platforms 
This patch adds documentation for qemu/virt and
qemu/sifive_u platform supports.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
2018-12-31 09:33:04 +05:30

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QEMU RISC-V Virt Machine

The QEMU RISC-V Virt Machine is virtual platform created for RISC-V software development. It is also referred to as QEMU RISC-V VirtIO machine because it uses VirtIO devices for network, storage, and other types of IO.

To build platform specific library and firmwares, provide PLATFORM=qemu/virt parameter to top-level make.

Platform Options

We don't have any platform specific options for this platform.

Try on QEMU RISC-V 64bit

No Payload

Build:

    make PLATFORM=qemu/virt

Run:

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

U-Boot Payload

Note: We assume that U-Boot is compiled using qemu-riscv64_smode_defconfig.

Build:

    make PLATFORM=qemu/virt FW_PAYLOAD_PATH=<uboot_build_directory>/u-boot.bin

Run:

    qemu-system-riscv64 -M virt -m 256M -display none -serial stdio -kernel build/platform/qemu/virt/firmware/fw_payload.elf
    or
    qemu-system-riscv64 -M virt -m 256M -display none -serial stdio -kernel build/platform/qemu/virt/firmware/fw_jump.elf -device loader,file=<uboot_build_directory>/u-boot.bin,addr=0x80200000

Linux Payload

Note: We assume that Linux is compiled using defconfig.

Build:

    make PLATFORM=qemu/virt FW_PAYLOAD_PATH=<linux_build_directory>/arch/riscv/boot/Image

Run:

    qemu-system-riscv64 -M virt -m 256M -display none -serial stdio -kernel build/platform/qemu/virt/firmware/fw_payload.elf -drive file=<path_to_linux_rootfs>,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -append "root=/dev/vda rw console=ttyS0"
    or
    qemu-system-riscv64 -M virt -m 256M -display none -serial stdio -kernel build/platform/qemu/virt/firmware/fw_jump.elf -device loader,file=<linux_build_directory>/arch/riscv/boot/Image,addr=0x80200000 -drive file=<path_to_linux_rootfs>,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -append "root=/dev/vda rw console=ttyS0"