[Arm-netbook] eoma68 rk3288 testing

[Luke Kenneth Casson Leighton]

http://rhombus-tech.net/rock_chips/rk3288/news/

i now have 2 assembled PCBs with the exact same "fault" - which after
talking to paulk and akaka on #linux-rockchip i *may* have a lead on
how to get the DDR3 RAM up and running properly.  we believe it's down
to the impedance control register (ZQCR) which is being hard-coded in
u-boot-rockchip rather than being allowed to "train".  those values
are suited for 6-layer 1.6mm PCBs - the impedance of tracks when you
have an 8-layer 1.2mm PCB are *half* what they are for 6-layer 1.6mm
PCBs.

l.

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crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68