Lwip ported to riscv http://savannah.nongnu.org/projects/lwip/. Lwip taken from https://github.com/ReturnInfinity/BareMetal-lwIP and (https://github.com/ReturnInfinity/BareMetal-OS). riscv code and e1000 driver from github.com/mit-pdos/xv6-riscv.git
build with make and run mk script