I had same problem in 1-chip Test.
I just changed additional recv size. :-)
(at [register read] & [result read] )
Can 2-chip cgminer fork with RX buffer patch be uploaded to Bitmine Github ?
That needs to be forked from someone actually having that kind of hardware (I don't). The driver that is in cgminer upstream repository is specifically for the CoinCraft Desk modules, every derivative will need to have its dedicated driver.