The Spike is a RISC-V ISA simulator which implements a functional model of one or more RISC-V harts. The Spike compatible virtual platform is also available on QEMU. In fact, we can use same OpenSBI firmware binaries on Spike simulator and QEMU Spike machine.
For more details, refer Spike on GitHub
To build the platform-specific library and firmware images, provide the PLATFORM=generic parameter to the top level make command.
The Spike platform does not have any platform-specific options.
No Payload Case
Build:
make PLATFORM=generic
Run:
spike build/platform/generic/firmware/fw_payload.elf
Linux Kernel Payload
Note: We assume that the Linux kernel is compiled using arch/riscv/configs/defconfig.
Build:
make PLATFORM=generic FW_PAYLOAD_PATH=<linux_build_directory>/arch/riscv/boot/Image
Run:
spike -m256 \ --initrd <path_to_cpio_ramdisk> \ --bootargs 'root=/dev/ram rw console=hvc0 earlycon=sbi' \ build/platform/generic/firmware/fw_payload.elf
or
spike -m256 \ --kernel <linux_build_directory>/arch/riscv/boot/Image \ --initrd <path_to_cpio_ramdisk> \ --bootargs 'root=/dev/ram rw console=hvc0 earlycon=sbi' \ build/platform/generic/firmware/fw_jump.elf
No Payload Case
Build:
make PLATFORM=generic
Run:
qemu-system-riscv64 -M spike -m 256M -nographic \ -bios build/platform/generic/firmware/fw_payload.elf
Linux Kernel Payload
Note: We assume that the Linux kernel is compiled using arch/riscv/configs/defconfig.
Build:
make PLATFORM=generic FW_PAYLOAD_PATH=<linux_build_directory>/arch/riscv/boot/Image
Run:
qemu-system-riscv64 -M spike -m 256M -nographic \ -bios build/platform/generic/firmware/fw_payload.elf \ -initrd <path_to_cpio_ramdisk> \ -append "root=/dev/ram rw console=hvc0 earlycon=sbi"
or
qemu-system-riscv64 -M spike -m 256M -nographic \ -bios build/platform/generic/firmware/fw_jump.elf \ -kernel <linux_build_directory>/arch/riscv/boot/Image \ -initrd <path_to_cpio_ramdisk> \ -append "root=/dev/ram rw console=hvc0 earlycon=sbi"