Topic: ANTMINER S2 Discussion and Support Thread - page 151. (Read 355842 times)

Format the card and image it, try to boot, if it won't boot take a few asic cards out so you can read teh BBB and eject the sd card while the unit is on, then put it back in, you'll see the ethernet lights cycle, I've had that make mine turn on before.


In other news, I did have a bad BBB that wouldn't write to the SD card. I replaced it with a factory BBB, that's what my machine is using now

CLASS 10 microSD

What kind of SD card should I buy?  Regular SD or micro SD?  

Buy new SD cards

So i've had my three batch 1 S2's running for over a week now, and have some observations:

Stable. 
when they run, they run.  have not had the need to babysit them.

corrupt SD cards. 
twice now, i've gotten corruption on the SD card on one machine or another.  If there's a power cut, i cross my fingers and hope for the best.  chances are, at least one machine will need it's SD card removed and re-imaged.  Big thanks to the guy who posted a link in this thread to a copy of his SD card.  Although Bitmaintech has now posted updates to the firmware, they are in the format needed to update via the web gui - not directly image the SD card.

this problem is particularly concerning as there is no "shutdown" option in the GUI or button on the case.  just the power switch.  So each time you shut it off, you have a 50/50 change of buggering the software.... yikes.

can't power on.
This problem is unrelated to the software issue described above.  for some reason, there's some kind built-in protection in the power supply that prevents it from being turned off and on again quickly.  i guess this is a good thing, except it give the impression that the thing is dead until you leave it be for at least 15 minutes between powering off and on again.   Have not found any work-around.  Now that i've learned this, i know to expect it, but to the uninitiated it is a temporarily heartbreaker.

more importantly, what's it hashing at the Pool??

OC'd @ 200 - ASIC Freq


OC'd @ 225 ASIC Freq



Replaced PSU w/ EVGA 1300.

Hardware errors are much higher! But it is doing short of 2000 WU more per minute @ 225.

Format the card and image it, try to boot, if it won't boot take a few asic cards out so you can read teh BBB and eject the sd card while the unit is on, then put it back in, you'll see the ethernet lights cycle, I've had that make mine turn on before.


In other news, I did have a bad BBB that wouldn't write to the SD card. I replaced it with a factory BBB, that's what my machine is using now

78-80 degress, cali is getting warm....all 3 are running, 2 fully, 1 with only 9 blades and Without the provide PSU as it shuts down, max temp of all units is 58C as usual on blade 1

The PSU shut down after 8hrs or so....I removed in put in a 1200W temp PSU....checked the bad PSU would power up, but now that its cooled it powers up.

My S2 was running fine overnight since last evening. Suddenly stopped hashing (based on pool stats).
Will have to investigate when I come back from work.

Anyone else had a similar experience?

Anyone have any luck with overclocking? I've been running 5 s2's at 225MHZ (EVGA 1300W PSUs) for 24HRs. Here's the 12HR average for 5 machines which, at the console, report 1150GH/s each.

user root pass admin

It seems like sync and halt in the shell might help, but I can't seem to ssh into it the way I can into the S1s. Is there a trick to it?

Not that I've found. Haven't had a problem with the Batch 2 yet.

Also, I took one of the corrupted SD cards and made an image of it and sent it to the bitmain engineers. Hopefully it'll tell them something

Well thank you my friend, but i'm concerned that i may actually be on the wrong track.....

Since a power outage earlier today, i've been busy reimaging the SD cards of two out of my three S2's.  The power outage knocked out two of them but the 3rd booted back up no problem.

I have now reimaged the SD cards twice, but i still can't get the machines to boot!

The lights of the BBB board all light up, but the blue activity lights do NOT.  This, to me, means the BBB board failed to boot for whatever reason.  In the past, it's been a corrupt SD card due to loosing power at a bad time, but i just can't seem to solve it this time.

I'm now imaging again using your just-uploaded version.  fingers crossed.

if this doesn't work, then what???