Hi,
With help from Johannes Berg, I've been working on reverse engineering
the firmware to try and understand the instruction format. Assuming we
can figure out all of the instructions, the end result is that we'll be
able to produce an open source firmware.
So far I've built up a partial understanding of 4 instructions. I have
produced a home-grown disassembler and a lex+yacc-based assembler. In
the disassembled format, unrecognised code (i.e. instructions outside of
the 4 I understand) is stored as blobs of data for now.
Have you thought about trying some well known instruction sets like Intel
8052 / Atmel AVR ? Even the chip makers that have their own instruction sets
seem to make 8052 based chips as well. I think the Intel 8052 instruction set
would be your best bet, since 8052 based micro controllers just seem the most
widely used.
Or did someone at Zydas actually tell you that their chips use some custom
micro controller ?
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