# Mining With SBC

The following guide will show you how to compile a CPU miner (xmrig) for SBCs like the Raspberry Pi.

What are the benefits of compiling xmrig from scratch?

* You'll have the most up-to-date version of xmrig
* You can optimize xmrig for specific SBCs (improves hash rate)
* You can compile xmrig with different releases of GCC (may improve hash rate)
* It's possible to disable certain features of xmrig (more info)

### Setup

First we want to make sure your SBC's software is up to date:

`sudo apt-get update && sudo apt-get upgrade`

After that's done, we're going to install some tools that are important for the process:

`sudo apt-get install git build-essential cmake make libuv1-dev libmicrohttpd-dev gcc g++ automake autoconf pkg-config libcurl4-openssl-dev libjansson-dev libssl-dev libgmp-dev`

### Compiling xmrig

At this step we'll obtain the latest binaries of xmrig and create a directory called build:

`cd ~` `git clone https://github.com/xmrig/xmrig.git` `cd xmrig && mkdir build && cd build`

Now we specify the build flags to optimize xmrig for your SBC in particular. You'll have to only choose one of these:

* for any SBC:

`cmake ..`

* for the Raspberry Pi 2:

`cmake .. -DCMAKE_C_FLAGS="-mcpu=cortex-a7 -mtune=cortex-a7" -DCMAKE_CXX_FLAGS="-mcpu=cortex-a7 -mtune=cortex-a7"`

* for the Raspberry Pi 3:

`cmake .. -DCMAKE_C_FLAGS="-mcpu=cortex-a53 -mtune=cortex-a53" -DCMAKE_CXX_FLAGS="-mcpu=cortex-a53 -mtune=cortex-a53"`

* for the Asus Tinker Board:

`cmake .. -DCMAKE_C_FLAGS="-march=armv7-a" -DCMAKE_CXX_FLAGS="-march=armv7-a"`

You may find the right flags for your board here. I was only able to test these on a Raspberry Pi 2 and the Asus Tinker Board. Also, this guide is not perfect, so feel free to add/edit flags or devices!

To finish the compilation type:

`make`

To speed up the compilation you can add `-j [amount_of_CPU_cores]`. On a Raspberry Pi 2/3 this would be `make -j 4` for example.

## Configuring and Running xmrig

First we need to copy `config.json` to the same directory the xmrig executable is located:

`cp ~/xmrig/src/config.json config.json`

Now we have to edit the configuration file properly. In this guide we'll be using nano, but any other text editor should also work fine:

`nano config.json`

Your terminal should display the contents of `config.json`.

* In order to mine Qwertycoin, we tell xmrig what algorithm you want to mine. Look out for the `"algo":` setting and change it to `"algo": "cryptonight",`
* In place of "url": "pool.qwertycoin.org:3333", you'll need to choose a pool to mine towards. Make sure to choose the right port. You can check the full list of pools here.
* Instead of "user": "YOUR\_WALLET\_ADDRESS", simply paste your Qwertycoin wallet address. If you don't have one yet, you can find out how to create a wallet here.

When you're done with that, press:

`CTRL + O` to save, confirm with `Enter`. And after that, hit `CTRL + X` to close the file.

Then start the miner:

`./xmrig`

After entering this command, the miner will start scanning your hardware and begin to mine.

Congratulations! You did it! :)


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