On 2018-04-13 00:46, Luke Kenneth Casson Leighton wrote:
superb. i might point someone i know at these, he may be interested to use them.
You are welcome :)
Now I customize the design into a new minimalist R40 server board: https://www.hellosemi.com/KiCAD_Server_Board.html
This board has 2GB RAM, gbit ethernet, SATA, camera, MIPI display, HDMI, uSD, 8GB flash, USB OTG, USB 2.0 x 2. Removed are wifi/bluetooth, audio, mic, Pi connector, IR module. The 8GB flash required a lot of rework as the BGA pinouts were incorrect in the original drawing. Also I had duplicate annotation and missing annotations in my previous KiCAD. Added more footprints where they did not exist from KiCAD libraries. All footprints were copied to local relative directory because switching between different PCs is a total pain at this moment with KiCAD. After all that work, the netlist import works without errors, and viewing 3D works without errors :) Anyone can lay it out now. I'm guessing this PCB will come out with a BOM cost less than $20.
For some reason Allwinner R40 SATA read seems fast but write is very sloooow. Anyone know?