The riscv-softmmu target for full system emulation is currently supported. It supports booting riscv-linux (currently requires building from the qemu branch). A precompiled copy of the kernel is included in the "hacking_files" directory for convenience (see Method 1 under installation).

A sample kernel with an initramfs is included in the "hacking_files" directory. You can easily test out riscv-qemu this way:

$ git clone https://github.com/ucb-bar/riscv-qemu
$ cd riscv-qemu
$ git submodule update --init pixman
$ ./configure --target-list=riscv-softmmu
$ make
$ cd riscv-softmmu
$ # now, start qemu
$ ./qemu-system-riscv -kernel ../hacking_files/vmlinux/vmlinux -nographic

To exit this system, hit ctrl-a x.

Booting from a block device is also supported. A more extensive guide for configuring the kernel/building a root fs will be available soon.

####Step 1:

$ git clone https://github.com/ucb-bar/riscv-qemu
$ cd riscv-qemu
$ git submodule update --init pixman
$ ./configure --target-list=riscv-softmmu
$ make
$ cd riscv-softmmu

####Step 2:

Instructions for the following two steps are coming soon:

a) Build linux kernel from the qemu branch of riscv-linux with htif block device support.

b) Build the root.bin root filesystem.

####Step 3:

Now from the riscv-softmmu/ directory, start qemu-system-riscv:

$ ./qemu-system-riscv -hda [your root.bin location] -kernel [your vmlinux location] -nographic

IMPORTANT: To cleanly exit this system, you must enter halt -f at the prompt and then hit ctrl-a x. Otherwise, the root filesystem will likely be corrupted.

• Qemu also supports a "linux-user" mode, however this is currently not implemented for RISC-V.
• Once in a while, you may see a message from qemu of the form main-loop: WARNING: I/O thread spun for N iterations. You may safely ignore this message without consequence.
• Files/directories of interest:
  • target-riscv/
  • hw/riscv/