The Linux Serial HOWTO is available from mirrors of sunsite around
the world. If you don't know where your nearest mirror is, start at
http://sunsite.unc.edu/mdw/linux.html
Fuller details of the Xconfig and XF86Config files are found on the
relevant man pages, and in the documentation about installing X windows
such as the Xfree86 HOWTO. Also, see the XFree86 FAQ at a mirror of
http://www.XFree86.org/.