All About BTC, LTC, ETH mining as well as other alternative crypto currencies
The user who has previously released an RPi OC version for Innosilicon A2 miners that did not work properly due to the fact that the official cgminer provided only accepted a few fixed operating frequencies has updated the image to version 2.0 and now it works. The new version adds support for 1000 MHz and then from 1080 MHz to 1400 MHz in 20 MHz steps and now the cgminer accepts these values due to a modification done to the A2 driver. So if you are an owner of an A2-based miner using 28nm Innosilicon Scrypt ASIC chips you might want to try the image out, we have already checked it and can confirm it works well.
Innosilicon still has not made any release of the source code of their cgminer fork with support for the A2 Scrypt ASIC chips, what you get with their A2 Terminator Scrypt ASIC devices is a Raspberry Pi with a preloaded cgminer and simple web interface to control the device. The standard web interface however is a bit limited in the supported operating frequencies – 1000 and 1200 MHz. The recompiled cgminer does allow for a few more operating frequencies to be used, however they are not selectable by default through the web interface of the miner. Some time ago there was a modified image released by a user called Emdje that supposedly allowed more overclock options. However it has turned out that it was not really functional as even though you could select operating frequency at steps of 5 MHz the cgminer did not accept these values and instead defaulted to some of the supported frequencies.
Back when we first had the chance to do a remote test of a A2BOX Scrypt ASIC miner we have discovered that the only supported operating frequencies by the Innosilicon A2 Terminator Scrypt ASIC miners are: 1000, 1080, 1100, 1200, 1280, 1300 and 1400 MHz. This is why we have made a modification to the standard RPi image that ships with the A2 miners, so that you can quickly and easily add the supported frequencies to be selectable from the web interface of the miner. This should allow you to squeeze some more extra performance from your device, regardless if it is the smaller 2 module or the large 6 module ASIC model, as our tests have shown that most of the miners should be able to work pretty well at up to 1280-1300 MHz up from the maximum of 1200 MHz that you have by default. Below you can download the modification we have prepared along with the instructions on how to update your miner, so that you get the extra OC options available.
How to login to your miner via SSH/SFTP using putty/WinSCP:
– username: pi
– password: innosilicon
Where to find the miner and web interface:
Replace the index.php file with the following modification:
– modified index.php
All that is left is to refresh the webpage with the miner interface and you should see the new options for operating frequencies available in the dropdown boxes for the A2 modules. For the smaller miners you need to select just the first two frequencies as you can see on the image above, for the large A2 miners you need to set all of the six frequencies. Do note that each of the modules can operate at a different frequency, so experiment and set the best frequency for each one that gives the lowest HW error rate and optimum performance.
Something very interesting for the people with Innosilicon A2-based Scrypt ASIC miners, a Raspberry Pi image based on the original Innosilicon web-based interface, but with much more options for setting the operating frequency of the miner. This release by a user called Emdje should be compatible with both the smaller and the large A2 Scrypt ASIC miners allowing the users to set the operating frequency of the chip boards available between 1200 MHz and 1330 MHz, in increments of 5 MHz. This allows for some fine tuning to reach better performance balancing the performance and HW error rate optimally for your own mining hardware, as the default RPi image for the A2 miners from Innisilicon limits you to either 1000 MHz or 1200 MHz setting for the frequency. And an operating frequency of more than 1200 MHz with no significant increase in the number of HW errors is easily achievable as these A2-based miners are operating very cool and can be pushed some more. And who would not wan to get some extra hashrate from the existing mining hardware…