/build_xmrig_for_armv7

How to build the XMRig for a Raspberry Pi machine with ARMv7 architecture

In the following notes we assume that you want to build the cpuminer-multi software for a Raspberry Pi with ARMv7 architecture.

Basically, ARMv7 and below are 32-bit while ARMv8 introduces the 64-bit instruction set. The latest version of Raspberry Pi 4 comes with an ARMv8 64-bit instruction set.

We will use the repository main xmrig repository.

Check your machine

Just to make sure you have an armv7 RPi you can run the following command in a shell prompt:

root@raspberrypi:~# uname -m

You should get a response like this:

root@raspberrypi:~# uname -m
armv7l
root@raspberrypi:~#

Another way to check the architecture of your CPU is the lscpu command:

root@raspberrypi:~# lscpu 
Architecture:        armv7l
Byte Order:          Little Endian
CPU(s):              4
On-line CPU(s) list: 0-3
Thread(s) per core:  1
Core(s) per socket:  4
Socket(s):           1
Vendor ID:           ARM
Model:               4
Model name:          Cortex-A53
Stepping:            r0p4
CPU max MHz:         1200.0000
CPU min MHz:         600.0000
BogoMIPS:            38.40
Flags:               half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32

Install the required libraries in the system

Before starting the build please make sure you have installed the following libraries (make sure you are logged in as root otherwise you will have to use sudo infront of each of the commands):

root@raspberrypi:~#  apt update
root@raspberrypi:~#  apt-get install git build-essential cmake libuv1-dev libssl-dev libhwloc-dev

Clone the GitHub repository of the software

We will use the main repository :

root@raspberrypi:~# git clone https://github.com/xmrig/xmrig.git

Prepare and build

root@raspberrypi:~# cd xmrig
root@raspberrypi:~/xmrig# mkdir build
root@raspberrypi:~/xmrig/build# cmake .. -DARM_TARGET=7

If you get any errors about

undefined reference to `__atomic

please add following line to the file CMakeLists.txt:

set(CMAKE_CXX_LINK_FLAGS "${CMAKE_CXX_LINK_FLAGS} -latomic")

Rerun the cmake command and if no errors appear you are ready to go:

root@raspberrypi:~/xmrig/build# make

Check miner

If everything gone well when you run the command :

root@raspberrypi:~/xmrig/build# ./xmrig --help

You should get a similar screen like this:

Usage: xmrig [OPTIONS]

Network:
  -o, --url=URL                 URL of mining server
  -a, --algo=ALGO               mining algorithm https://xmrig.com/docs/algorithms
      --coin=COIN               specify coin instead of algorithm
  -u, --user=USERNAME           username for mining server
  -p, --pass=PASSWORD           password for mining server
.....

Start mining!

You are ready to create the configuration file,use your favorite mining pool and start mining:

root@raspberrypi:~/xmrig/build#  ./xmrig -c <config_filename>

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