EPIA-M DDR SPD detection

[Dave Ashley]

It appears we've got 3 people interested in having this functional,
Ron, Andrew and myself.
Myself = I need it working asap just to round out our epia-m solution
Andrew = Seems to be working on it right now, priority unknown
Ron    = Seems to want it eventually but if it's in freebios2 that would be ok

As I understand it Ron doesn't have an epia-m to experiment with anyway.
I can't do anything with freebios2 at this stage since everything is
working so well with the freebios mechanics as it is. I don't mind doing
bit banging in X86 code to get stuff done. Someone else can clean that up
at a later date and convert it to C/romcc for maintainability.

Now realistically I knew nothing concrete about DRAM configuration or the
details on the SPD system itself until some time 2 days ago and the time
since. With the lm_sensors project I've managed to read out the serial
eeprom contents and view it with a perl script and it looks like the right
stuff. But I wouldn't know how to interpret that data and configure the
dram controller and the ddr ram itself appropriately without more studying.

What I can contribute quickly could be figuring out how to read the
SPD data from the VT8235 I2C or SMB bus or whatever early in the boot
process. I was going to look into this right now anyway. Then maybe one of
you other guys can run with this info to get the SPD dram configuration
working.

-Dave