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When looking through the code, it seems that ICX1087 is the name Sony has defined for their system (Maybe a MP201 with some Sony modifications. A Google search on 'ICX Sony' gives a lot of Sony semiconductor components results.
I just started a port page for the NWZ-A728, which is similar to the A80x, without the bluetooth. You can head over there http://www.rockbox.org/wiki/WalkmanNwzA728Port, and read up on what I have right now. If you want to send me more information, PCB scans, detailed specs, etc, send me an email @ firstname.lastname@example.org.
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