Script mining with Gridseed dual miner GC3355 in Ubuntu 14.04

Dualminer GC3355

Gridseed Dual miner GC3355

To use Script mining (LTC) with usb Gridseed dual miner GC3355 in Ubuntu 14.04 you can use a specific version of cpuminer.


Packages to compile in Ubuntu have to be installed.

sudo apt-get install build-essential libtool libcurl4-openssl-dev libncurses5-dev libudev-dev autoconf automake 

Then use git to download the specific version of cpuminer

git clone
Gridseed github

Gridseed github

Go to subdirectory

cd usb-miner/software/cpuminer

start compiling


I don’t like to install it so I don’t use make install but only make.


Now we have to check the “name” of usb miner. It should look like ttyACMx or ttyUSBx

To find dual miner name you can use lsusb and/or dmesg.

maurizio@ubu1404m:~$ lsusb
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 07ca:a835 AVerMedia Technologies, Inc. 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 005: ID 0483:5740 STMicroelectronics STM32F407
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub


maurizio@ubu1404m:~$ dmesg | grep STM32
[    2.144384] usb 8-2: Product: STM32 Virtual COM Port 


maurizio@ubu1404m:~$ dmesg | grep "8-2"
[    2.097744] usb 8-2: new full-speed USB device number 3 using xhci_hcd
[    2.144378] usb 8-2: New USB device found, idVendor=0483, idProduct=5740
[    2.144382] usb 8-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    2.144384] usb 8-2: Product: STM32 Virtual COM Port  
[    2.144385] usb 8-2: Manufacturer: STMicroelectronics
[    2.144386] usb 8-2: SerialNumber: 6D765F835251
[    2.144573] usb 8-2: ep 0x82 - rounding interval to 1024 microframes, ep desc says 2040 microframes
[   18.512138] cdc_acm 8-2:1.0: This device cannot do calls on its own. It is not a modem.
[   18.512206] cdc_acm 8-2:1.0: ttyACM0: USB ACM device

In this case the dual miner GC3355 is  ttyACM0  

The base command to start miner is

miner -G /dev/ttyACM0 --url=yourpoolurl:port --userpass=yourusername.worker:password


Dualminer GC3355 working

Dualminer GC3355 working

In Script mode default frequencies is 600MHz.
Power consumption is about 7Watt.
For me Hash is about 250KH/s.

In Script single mode you can “overclock” dual miner changing frequencies.

To change frequencies use parameters –freq= .  Don’t exceed freq=850 MHz. It’s dangerous.

This is the general command for cpuminer

sudo ./minerd --freq=600 -G /dev/ttyACMx(x=Number for device)  [if more then one miner write -G before each] --url=yourpoolurl:port --userpass=your_username.your_worker:passwordworker