In the ffuart.tar.gz it has one file.
The serial.c is the source codes of the FFUART as a console port, it should be put into the directory: /usr/src/linux/drivers/char/, and be compiled into the kernel.
Simple C Compiler, Release 0.1.6
Simple C is a portable C compiler based on Small C/386. It is designed
to run on Linux, but it should be usable on any Unix-like operating
system for the x86 with minimal effort.
