Re: BFL board project COINTAMINATION - EU facility

I got my boards back from ChipGeek and got the first one assembled. It does a very slow ramp up on the volts but as soon as it hits 1.1v it crashes. After a bit it resets itself and does it all over again. It doesn't force cgminer to crash though. So forgive me but what "trick" should I be doing to keep it hashing?

I have 2 boards that need some "draft protection" over the power modules but still need additional underside cooling.

https://www.dropbox.com/s/a5t436j4y788r7p/2014-01-28%2021.46.42.jpg (any moving air over the modules and it crashes)

If its reaching 38Gh it will need the voltage limiting software

"Draft Protection" nice call I moved it away from the fan and it is holding steady right now at 32GH/s at 1.06v. I got them both assembled and they are both holding at 1.06v the other hashes at 35GH/s.

Question for Lucko: Did you test each board and decide the optimal firmware (I know, a lot of work) or are you putting the same firmware on all boards?

I too am pleasantly surprised I expected a host of issues and really have had none (except for damage from shipping) other than moving one out of the way of the fan.

Thanks...

EDIT: Oh by the way the damn red led lights made my heart jump when I first powered it up. I thought uh oh that doesn't look right...

I think your problem is too low ambient temperature. I'm doing this at home now not in a workshop so I get them tested at lower temperature. I also asked if I could get slow rise 1.1V limiter firmware but didn't get it. I think that one would help your board. I did test boards wit a lot of different PSU(they also affect them how they work) and range of conditions. And put on what looks to be working best. Unfortunately Mrteal did not make the firmware that would work best with yours.

Yes read leds are in BOM. If you had a green ones it was a mistake done in first assembly if I'm not mistaken... You can read that in Chili tread...

The LEDs were green throughout the Chili run. We were originally going to switch back to red so they would be brighter, but in the end we decided to just keep it continuous instead of having two different styles. I actually like the green ones in there being dim. It reduces the number of bright LEDs that are on all the time. I love the Antminers I have, but those LEDs are obnoxious.

For the limiting firmware, there is a 14g under development now that besides having several features and enhancements for everyone includes some that should specifically help your run of boards. The slow ramp to help heat the boards will be more efficient and will be active at the time instead of just on the startup. As well, the board will drop to idle voltage (0.9V) if there is no work and then slowly ramp back up. That should help prevent resets in the case where the board cools due to lack of work and then starts back up.
The maximum voltage will also be configurable through a z command, so a user can tweak that parameter on their own rather than having different firmwares for different voltage limits.