  RISC-V is an open and royalty free instruction set architecture which has
been developed at the University of California, Berkeley. The processors using
RISC-V can be designed and released freely. Because of this, various processor
cores and system on chips (SoCs) have been released so far. However, there are
a few public RISC-V computer systems that are portable and can boot Linux
operating systems. In this paper, we describe a portable and Linux capable
RISC-V computer system targeting FPGAs in Verilog HDL. This system can be
implemented on an FPGA with fewer hardware resources, and can be implemented on
low cost FPGAs or customized by introducing an accelerator. This paper also
describes the knowledge obtained through the development of this RISC-V
computer system.
