Is there any info...? Or some help where to start?
http://en.wikipedia.org/wiki/Advanced_M ... chitecture
If you can find a copy of ESP8266_Pin_List_141105.xlsx, it has a lot of the internal pin connections listed. Doubt it'll be of any help though. You really need specific details of how its all routed internally to get DMA working, until Espressif release any details.