http://rhombus-tech.net/allwinner_a10/news/
ok so after the successful DC3 test this is the last final check before sending the gerbers off to the factory for pre-production prototyping. in the end i used a "keepout" area on both layers 1 and 3, drawn by hand, to ensure that no GND flooding gets near the HDMI traces on layers 1 and 6. l'm including layer 3 as an example of how the group of HDMI vias that come just out of the A20 punch a large hole: GND-flooded layers 2 and 5 as well as 4 (power plane) will also look like that.
richard if you want to zoom in on those pictures you should be able to click on them in a browser, then expand them: they're actually around 2,500 pixels wide, i just asked them to be displayed in that HTML page as only 1024 otherwise they wouldn't fit :)
you can see i removed the GND traces in between, and generally kept everything except VIAs away from them. it's not perfect but thanks to your help i'm pretty happy with it. if there's nothing major i want to send this off.
l.