File overview:

grubload/
  A multiboot-compliant simple ELF loader, for use with NetWatch aseg.elf
  images or similar.  It loads its input file (passed via multiboot),
  invokes the startup routines, and then returns to real mode and starts the
  bootloader again.

ich2/
  Intel ICH2 northbridge/southbridge drivers. A similar API should be
  implemented to port NetWatch to other chipsets.

ich7/
  Intel ICH7 northbridge drivers. Incomplete.

include/
  General header files.

lib/
  Library functions.

lwip/
  LWIP. (http://www.sics.se/~adam/lwip/)

net/
  Network card (currently only 3c90x) drivers, glue code, and the RFB and
  HTTP applications.  Other network drivers and applications should go here.

netwatch/
  Main startup and initialization code, logging, SMI response, VGA text
  overlay, and other general top-level sources.  To build the main NetWatch
  binary, run "make" here to produce aseg.elf.
 
pci/
  PCI bus interface and BAR-clobbering routines.

tools/
  Assorted useful Linux command line tools we've found useful, such as for
  SMRAM segment manipulation, raw I/O port pokes, etc.  These are not
  required to use NetWatch.

video/
  Framebuffer drivers for VGA text and TNT2 graphics consoles. Supporting
  graphics on other chipsets will require writing a driver similar to that
  in tnt2.c.

---

Porting NetWatch to other systems will likely require:
  - A network driver, if you don't have a 3c905 (net/3c90x.c)
  - A video driver, if you are interested in graphics rather than VGA text,
    and don't have an NVidia TNT2. (video/tnt2.c)
  - North- and southbridge drivers for your chipset. (ich2/)

We have found that Intel generally provides easily-accessible chipset
datasheets on their website; searching for a particular ICH series part on
Google will likely lead to the correct datasheet without too much trouble. 
Other chipset manufacturers have been found to be significantly less
cooperative.