[Arm-netbook] SoM2 board updated

[jm]

Hi,

SoM2 board updated so its now possible to make own tablet, EOMA, ARM
microserver etc by just doing up the wiring and board layout.

The GT8UB256M16BP memory chips x 2 (for 1GB DDR3 RAM), 40 pin standard
FPC type LCD connector, AXP209 and microSD schematic symbols added to
the schematic. The footprints for the memory chips, LCD, AXP209 and
microSD card added. The 96bga memory chip footprints taken from Luke's
EOMA project repaired. The xtals and their associated capacitors have
not been added - normally they should work OK by soldering to the break
out pins.

The wiring for the chips is unfinished.
But you can have a go and learn more KiCAD and how to make your own
tablet / IoT device! So too with the layout.

The idea is to remove the break out pins from the previous version of
the board and connect up the DDR3 RAM, LCD connector, microSD card and
AXP209 chip, leaving rest of the break out pins intact for prototyping
purposes. The components for the AXP209 chip and decoupling capacitors
have to be added too to make a complete working stand alone board.

The SO-DIMM connectors can be reserved just for GPIO and functions such
as SATA, Ethernet, USB etc. The SoM1 board
(http://www.gplsquared.com/SoM1/SoM1.html has full KiCAD files for
motherboard with 200 pin SO-DIMM connector.)

The 512MB cubieboard schematic is included. (The total RAM used here is
1GB - not 512MB.) In theory by following the cubie board to extract the
wiring diagram for the AXP209, uSDCard (TF Card), A10 CPU and LCD, it is
possible to make a complete device like a minimal EOMA device, or a
tablet, or an ARM Microserver, an Internet of Things controller board,
etc by completing the wiring puzzle and doing the PCB layout.


All files GPL'd so you can take it and do much as you want to modify and
make your own boards / sell it etc.


11 February 2013 -
http://www.gplsquared.com/SoM2/SoM2_2013_02_11.tar.bz2

All the files are in one tarball so you don't have to go hunting down
the relevant files. They will be moved to a git repository soon.

NOTE - Need latest KiCAD for Ubuntu - Get it from here:
https://launchpad.net/~adamwolf/+archive/kicad-testing-daily

Any suggestions for improvements and advise greatly appreciated.
If you spot any mistakes, let me know.
Any advise that might make this board work well first time is
appreciated.

Some of the boards will be going to manufacture soon after CN new year
celebrations are over.

Caveats apply - unlike SoM1 boards, none of the SoM2 boards have been
built or tested yet. So if you plan building your own - always check,
and double check for mistakes before placing orders for PCB.

Note the PCB must be 1mm thick if the SO-DIMM is to fit the connector.