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Author Topic: Avalon ASIC users thread  (Read 432462 times)
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May 28, 2013, 10:56:18 AM
 #921

The direct USB code does not really work at all on the MIPS router that is built into the Avalon device itself
Cancel that. Xiangfu set me up with usbmon on his standalone avalon and I was able to track down the problem so direct USB is now working on the avalon itself \o/

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May 28, 2013, 11:38:18 AM
 #922

Quote
Pretty simple and you will not find GitSyncom denying it unless he is lying or just ignorant of reality
(though he likes to do that here as further above is an example)

How nice... never ending story here... let it go.

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May 28, 2013, 12:37:03 PM
 #923

kano wants his free Avalon again Smiley
Yes, even after ckolivas and BitSyncom seems got agreement Smiley
And speaking for ckolivas (who is present here) is bad manners.

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May 28, 2013, 12:38:18 PM
 #924

The direct USB code does not really work at all on the MIPS router that is built into the Avalon device itself
Cancel that. Xiangfu set me up with usbmon on his standalone avalon and I was able to track down the problem so direct USB is now working on the avalon itself \o/
Glorious. I gonna tip you from my Avalon's income.

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May 28, 2013, 12:42:37 PM
 #925

The direct USB code does not really work at all on the MIPS router that is built into the Avalon device itself
Cancel that. Xiangfu set me up with usbmon on his standalone avalon and I was able to track down the problem so direct USB is now working on the avalon itself \o/
Glorious. I gonna tip you from my Avalon's income.

+1

Nice work.

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May 28, 2013, 03:16:45 PM
 #926

The direct USB code does not really work at all on the MIPS router that is built into the Avalon device itself
Cancel that. Xiangfu set me up with usbmon on his standalone avalon and I was able to track down the problem so direct USB is now working on the avalon itself \o/
Glorious. I gonna tip you from my Avalon's income.

+1

Nice work.

+1
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May 28, 2013, 08:58:11 PM
 #927

I'm still running 0225 firmware, it has been up and running since my last recondition of the heatsink, more than a week. Periodically cgminer would restart after  FPGA ran into disorder and reported all strange values from sensors (thus no more submitted shares), but after cgminer restarted, everything would back to normal again, no reboot/hardware reset needed

With this firmware, I can confidently leave the machine running at home and go for vacation  Smiley

I also tried 0419 version, although the FPGA seldom run into disorder, but once it does, no cgminer restart will solve the problem, a power cycle is needed


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May 28, 2013, 11:34:19 PM
 #928

I ran into a new sort of issue with my (batch 1) Avalon tonight.

I noticed it was no longer mining, and when I logged into the web UI, it loaded, but I was unable to load the cgminer status tab.

I ssh'd in, and saw way too many instances of /usr/bin/cgminer-monitor running:

http://pastie.org/7977320

At that point I rebooted the Avalon using the 'reboot' command, and it resumed working normally.

I'm running the 20130419 firmware.

"All safe deposit boxes in banks or financial institutions have been sealed... and may only be opened in the presence of an agent of the I.R.S." - President F.D. Roosevelt, 1933
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May 29, 2013, 04:05:24 PM
 #929

Has anyone noticed on their controller fpga board that the little USB chip deformed due to heat? When i put my finger on it, it's extremely hot. When the unit boots up cold it runs fine for about 15-20 minutes then hash rate goes to zero and it starts cycling running at low hash rates <1Gh/s. It seems like that chip on the controller needs a heat sink. I re-arranged my cabling and went zip tie crazy which seemed to improve the situation somewhat; but the unit still dies after a time. Checking the TP-Link, I was getting usb errors when the unit stops hashing.

https://en.bitcoin.it/w/images/en/a/ab/Avalon-controlunit-v1.2-usb-serail-chip.JPG

The chip is so deformed/warped on my board the lettering is completely gone.

Going to see if i can find a tiny heat sink to affix to it tomorrow. Maybe that will improve things.

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May 29, 2013, 04:19:24 PM
 #930

Has anyone noticed on their controller fpga board that the little USB chip deformed due to heat? When i put my finger on it, it's extremely hot. When the unit boots up cold it runs fine for about 15-20 minutes then hash rate goes to zero and it starts cycling running at low hash rates <1Gh/s. It seems like that chip on the controller needs a heat sink. I re-arranged my cabling and went zip tie crazy which seemed to improve the situation somewhat; but the unit still dies after a time. Checking the TP-Link, I was getting usb errors when the unit stops hashing.

https://en.bitcoin.it/w/images/en/a/ab/Avalon-controlunit-v1.2-usb-serail-chip.JPG

The chip is so deformed/warped on my board the lettering is completely gone.

Going to see if i can find a tiny heat sink to affix to it tomorrow. Maybe that will improve things.


Is this B#2 or B#1 unit?

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May 29, 2013, 04:21:34 PM
 #931

Is this B#2 or B#1 unit?

B#2

I noticed that the B#2 controller has a second USB header on there as well. I'm not sure if that goes to a different comm chip (not the same as the first header?)?

http://www.mysenselesslife.com/avalon/DSCN5212.JPG

Edit:

I've uploaded a much clearer photo which shows damage which I was not even able to see with the naked eye. Very concerning.

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May 29, 2013, 05:41:59 PM
 #932

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I've uploaded a much clearer photo which shows damage which I was not even able to see with the naked eye. Very concerning.
Oh my... Could anybody else check his "being in work" B#2 unit for this issue?

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May 29, 2013, 05:44:31 PM
 #933

Curious to see how the heatsink on top works out. It's probably not how you think it will, but hopefully it helps. That USB chip is not designed to dissipate heat upwards -- It's designed like the ASIC chips to push heat through the board down. Unfortunately, the PCB is not designed to handle that..
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May 29, 2013, 05:53:08 PM
 #934

Curious to see how the heatsink on top works out. It's probably not how you think it will, but hopefully it helps. That USB chip is not designed to dissipate heat upwards -- It's designed like the ASIC chips to push heat through the board down. Unfortunately, the PCB is not designed to handle that..

Def not going to be as effective; but if it's possible to get some heat out of it, it might just run stable.

Edit:

Just managed to slice a piece of heat sink off small enough to put on it. Been running for 5m and the sink is definitely above ambient. The hash rate seems a little more stable. The sink isn't HOT but it is taking some heat out of the chip.
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May 29, 2013, 06:17:36 PM
 #935

Curious to see how the heatsink on top works out. It's probably not how you think it will, but hopefully it helps. That USB chip is not designed to dissipate heat upwards -- It's designed like the ASIC chips to push heat through the board down. Unfortunately, the PCB is not designed to handle that..

Def not going to be as effective; but if it's possible to get some heat out of it, it might just run stable.

Edit:

Just managed to slice a piece of heat sink off small enough to put on it. Been running for 5m and the sink is definitely above ambient. The hash rate seems a little more stable. The sink isn't HOT but it is taking some heat out of the chip.

Are you using some sort of thermal paste/adhesive between the sink and the chip?
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May 29, 2013, 06:18:42 PM
 #936

Curious to see how the heatsink on top works out. It's probably not how you think it will, but hopefully it helps. That USB chip is not designed to dissipate heat upwards -- It's designed like the ASIC chips to push heat through the board down. Unfortunately, the PCB is not designed to handle that..

Def not going to be as effective; but if it's possible to get some heat out of it, it might just run stable.

Edit:

Just managed to slice a piece of heat sink off small enough to put on it. Been running for 5m and the sink is definitely above ambient. The hash rate seems a little more stable. The sink isn't HOT but it is taking some heat out of the chip.

Are you using some sort of thermal paste/adhesive between the sink and the chip?

Yes, its a thermal tape stuff (it was on the back of the sink i just scraped a bit off and reapplied after i was done butchering it.

Edit: Hit and passed the 15m mark.

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May 29, 2013, 06:24:51 PM
 #937

Curious to see how the heatsink on top works out. It's probably not how you think it will, but hopefully it helps. That USB chip is not designed to dissipate heat upwards -- It's designed like the ASIC chips to push heat through the board down. Unfortunately, the PCB is not designed to handle that..

Def not going to be as effective; but if it's possible to get some heat out of it, it might just run stable.

Edit:

Just managed to slice a piece of heat sink off small enough to put on it. Been running for 5m and the sink is definitely above ambient. The hash rate seems a little more stable. The sink isn't HOT but it is taking some heat out of the chip.

Are you using some sort of thermal paste/adhesive between the sink and the chip?

Yes, its a thermal tape stuff (it was on the back of the sink i just scraped a bit off and reapplied after i was done butchering it.
I'd try mount on top of this tiny heatsink a 40mm minifan. If this chip is a QFN package than just heatsink wouldn't be enough.

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May 29, 2013, 06:26:24 PM
 #938

Based on the way that 2 pin header melted it looks like the FTDI chip is putting out a lot of heat. The PCB has the ground pad and vias on the PCB top for that chip though. No thermal pad on the bottom. I wonder if you helped dissipate the heat from that chip if it would help...
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May 29, 2013, 06:29:05 PM
 #939

Based on the way that 2 pin header melted it looks like the FTDI chip is putting out a lot of heat. The PCB has the ground pad and vias on the PCB top for that chip though. No thermal pad on the bottom. I wonder if you helped dissipate the heat from that chip if it would help...

Unit just started cycling again. Reported sick, then the unit came back at a whopping 14-30Mh/s fans reving up and down.

The FTDI chip isn't warm at all. I'm thinking that usb-a goes to the FTDI and the USB-b goes to whatever chip was destroyed on my board.  Unfortunately I don't have a "normal" usb cable to test that theory. I'll give that a try tomorrow.

Image of my heat sink job:

http://www.mysenselesslife.com/avalon/DSCN5215.JPG



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May 29, 2013, 06:41:24 PM
 #940

Based on the way that 2 pin header melted it looks like the FTDI chip is putting out a lot of heat. The PCB has the ground pad and vias on the PCB top for that chip though. No thermal pad on the bottom. I wonder if you helped dissipate the heat from that chip if it would help...

Unit just started cycling again. Reported sick, then the unit came back at a whopping 14-30Mh/s fans reving up and down.

The FTDI chip isn't warm at all. I'm thinking that usb-a goes to the FTDI and the USB-b goes to whatever chip was destroyed on my board.  Unfortunately I don't have a "normal" usb cable to test that theory. I'll give that a try tomorrow.

http://www.mysenselesslife.com/avalon/DSCN5215.JPG

Just curious, what are your ambient conditions around your unit?
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