Well in the midst of not knowing what I was doing I put the v2 image from this and it is the home directory , you could mount it and it is in the /home/pi/spic1 dir
https://bitcointalk.org/index.php?topic=287590.0

I used kpartx -a image-file
mounts them to a loopback then you can mount /dev/mapper/loop0p2 to a dir and get it
of course this is all guessing your using linux

Well I did that and it detects two chips and hashed at .2 gh/s I noticed it drew .2A , since I made this board my self and used conductive silver epoxy for the vias the had failed where I attached the gnd connection since I was measuring from the wire it was ok but on the board it was .4v of course when I fixed that now I run cgminer and it finds two chips and says that thread 0 is disabled. draws 1.7 A now at least

Humm I see that there is more to it that I was thinking, I would have thought all the reading I have done .. any way, the !OEs are tied to ground to be always on, as for the current that is all it was drawing at that voltage, first power on was .1 after running the spitest-D went to ~.75

Yes I have determined that there are a lot of forks out there, I guess if I had been on from the start I would have understood more about this. I have tried two , legkodymov is the first one, and OpenGland I think. the first one just flashed the screen the second one acted like it detected it but sat there with 0 h/s. The level shifter I am using 74AVC4T24 is (hard)wired two bits one direction and two the other. Pins 19 and 23 go as outputs from the pi to BF and pin 21 as an input to the pi. Another thing is the current when I started was 0.8v @ 0.75A as I kept tinkering it was down to 0.35A after a while. I guess what I need to know is that does the spitest-D indicate that is does work to some degree, I have some other chips but I don't want to start just putting them on there yet. Also does there need to be any kind of termination on the last chip, I have hard talk of it at times but see a lot of single designs that don't have any.
thanks

First off I want to say thanks for any help, second I feel kind of dumb asking for help after all the reading I have done. What I have  is a raspi to a level shifter to a quad board I built with one chip on it. I have tested the spi loopback thought the level shifter and that is good and using spitest-D 1 5000000 gives me 12~13 solutions and when I put a 2 in the chip I get nothing like I expect. However when i build the cgminer fork with the --enable-bitfury and try to run it it does not detect any chips and drops out at first I could not tell the screen just flashed had to put -T on there. Just any ideas would be helpful.
thanks
Jarrid Graham

Thanks I figured that was pretty much a given anymore on chaining chips and such, good job and thanks again for the hard work!

Very nice, simple and effective, one question though could more chips be chained directly from the test points you have on the board? I have been working on a simple raspi to 4 chip but after I saw you USB interface I like that better but looking at the software comments it looks to be a 1:1 setup w/o more software work (or not I hope). At any rate pretty awesome and thanks for sharing !

Pretty crazy, I did try a peltier for a while, I found it everything gets to dependent on to many things. I had three that ran at 26 Mhz but one failed after a week and it seemed to kill the BE100 chip, voltage was pretty high ~1.3v or so I think it is over +7A on the low voltage. I had to put a (big) heatsink  on top and bottom, although with the peltier you could transfer more heat but as I was corrected a few messages back, these things use 6~8x more power to run at 2x the speed and it does cost a lot more plus all the added complexity but it was a fun experiment at any rate. All I used was air cooling for the setup would be interesting if you could actually lower the temp like that if it would help , one thing I noticed was the area that the heat is coming out of is really small, there is a lot of wasted cooling going into the board , especially if you remove the on board regulator. Glad to see someone is still tinkering around with them mine quit this past weekend when the power supply went out in the signal generator.

It looks like a 7mm x 5mm package area I could be wrong though.

Quite interesting, although I have never heard of such a thing , I had been wondering why I had not seen anyone get the max rate. Is this what I am thinking just a wad of circuits coming together ? I would guess with so many cores there would be a lot of busses.


Pretty cool to be able to visualize this, keep up the great work!

I wish I had gotten in on this months ago, I have to say I am impressed by the work done and the fact people can get boards make so quickly! I thought I was doing good getting my BEs running at 730Mh/s , all the time and work in doing that could have done a lot more with so much less. Seeing the design there is not much to change really I have tried to read every post on this, are there any major design changes that I might have missed? May lay out basically a single test board like I have seen, didn't see and design files laying around so I guess I'll lay one out. Good job to everyone involved pretty amazing!

I have wondered this also, just don't have one to try, I would say you couldn't go to far w/o some other mods, however I have been wrong before.

I can agree with what you said on this and it looks like I was not as correct as I thought, for me it is mostly playing just to see, like you said after all the work involved and parts, I am glad  electricity is not that high here Plus I am sure these will fail much sooner, I find it amazing that there even able to do this kind of overclock, the board being able to handle +7A and the ASICs going from 1.05V to 2.2V. I guess it goes to show that unless you get all the parts for free there pretty much at their operating/price point.

Yea 2x the speed 6x the power,I guess the only other way to look at is power is far cheaper then BEs. Some may be cooling but I tired to keep it within some limits, It would not be to practical if you had to use liquid nitrogen or something silly. Really this is mostly for learning I got curious just to see what they could do by the time you invest in all the extra stuff there going to take 2x forever to pay for themselves.

I would say it would burst into flames nearly instantly w/o all the heatsinks, they draw about 16 W each now.

Well 26 Mhz is about as far as they seem to want to go, actually 26.25 Mhz, at 26 was a lot more errors must have been some timing issue or something.

well you can solder a small wire strand, just the oscillator pad or the whole trace to the BE100? you should see the mess I have with one. I pulled all the parts and stripped it , and mapped it out, trying to put it back together pulled a trace on the silabs chip and on the BE100 , had to make another board to hold the silabs , got the BE100 back on and none of it works

That is a good idea, I'll try that, amazingly the top heatsink is the one that is getting the hottest right now, I am having some troubles with the middle one getting more errors, I think my top mounting arangement is causing a high spot over the top one, I am going to go back and use thermal pads on the top, I basically used a small 3/8" square x1/8" piece of aluminum on top of all the BE100s to space it up tall enough to mount the top heatsink on and clear everything. If I put to much pressure on them they get detected as different devices or go away, I guess I am shorting some signals on the bottom. I am not sure why the top one got 40 PH/s must have been really fast




Some old TI TUSB2046B's just full speed only but that is enough

My latest incarnation, decided to build a circuit board, plus as USB hub controller plus an aftermarket dc-dc , working the speed back up, I have found the problem that is causing my high speed issues seems to be ground loops, I guess it is to be expected with so many random parts in play. seems to be on the USB side I guess the long cable to the raspi that has a ground too. looks neat but doesn't work as well as I had hoped. I actually had all these parts already for many projects in the past. Have a single clock with a fanout buffer to the others. Plus all the work involved for such little gain really it changed it from ROI (just for the BE) in 100 days to like 70 ad the price I paid for them, buy then may not even do that. I think the best plan is to use the 16 Mhz and the resistor change far cheaper and effective. If I could get them to go to 28 Mhz would be lie having 7 for the price of 3 might be OK but I don't think I'll make it. As a friend of mine said "your pushing the limits of man and machine"

I don't think the options in the newer version of cgminer work anymore, I think someone said 3.1.1 was the last version that they worked in, I did not test it, but all versions of bfgminer I have used works fine with the -S all option