Hello,

Kyösti Mälkki said,

ECC signals between DIMM sockets and AM3 are not routed in AM1I-A
boardview files I found, while they are in AM1M-A boardview.

Are you able to link to these boardviews?

If ECC will not work on the AM1I-A but is known to work on the AM1M-A, and the boards are very similar, what would the steps look like for porting from one to another? The guide at [1] is very detailed about information gathering, but is scant on details about virtually everything else. (not to mention, does inteltool etc. even work on AMD boards?)

Thanks,

-Matt

[1] https://www.coreboot.org/Motherboard_Porting_Guide

On Thu, Sep 26, 2019 at 6:29 AM Alberto Bursi <alberto.bursi@outlook.it> wrote:

Unbuffered and/or NOT registered.

The buffered/registered is cheaper on ebay, and also higher density (up to 32GB or 64GB per DDR3 DIMM) so it could look like a bargain but it isn't.

It's cheaper because you can't use it on most consumer hardware.

AMD hardware that supports buffered and/or Registered ECC is Threadripper or server processors (Opteron, Epyc).

Similar for Intel, only server-grade Xeons and Enthusiast i7 processors (Socket 2xxx or something) support that.

Buffered/Registered RAM exists for servers that need to use large amounts of RAM, hundreds of GB or even a TB or more (for multi-CPU systems).

-Alberto

On 26/09/19 03:34, Matt B wrote:
Hello,

This might be a dumb question, but not having a manual to go off of, would the ECC ram have to be buffered or unbuffered? (if it can be made to work with the AM1I-A at all) Any other important specifications?

I bought a AM1I-A (I've had my eye on a good deal on ebay) and it should be here in a couple of weeks.

Sincerely,

-Matt

On Mon, Sep 23, 2019 at 8:06 PM Matt B <matthewwbradley6@gmail.com> wrote:

Hello,

That has short but very informative indeed. Thank you. :)

Even if the pinout is the same, is it possible that some connections have been left disconnected or components unpopulated on the board, which would prevent ECC from working?

As a more general porting question, what steps should be taken in porting coreboot to the larger board (the 'M' variant) to avoid unpleasant consequences?

I would think the PCI layout would be different (obvious, since one board has more slots then the other) but what should not be assumed to be the same?

Thanks,

-Matt
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