The file system is squashfs only, but you need to have support for this in kernel. In fact I have mounted the original files system and removed what is not wanted and added what is wanted like cgi support, tiny login etc.
How did u manage the LZMA compression. I have spent the last 20min trying to loop mount the compressed fs. Although it is supposed to be squashfs, it does not seem so. Also changes to the kernel will require recompression in LZMA (well maybe not but that is reeskeey). There is here
The data sheet is required to locate JTAG, second serial port, and I/O
http://www.mips.com/content/Products/Cores/32-BitCores/ MIPS324KEFamily/ProductCatalog/P_MIPS324KEFamily/productBrief
Warm Regards,
Mukund Deshmukh, Director, Beta Computronics Pvt Ltd, 10/1 IT Park, Parsodi, Near VRCE Exchange, Nagpur -440022 Cell 9422113746