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Signed-off-by: Yifei Ding <yifeiding@protonmail.com>
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# Beaglebone
This document describes the process of running Klipper on a Beaglebone
PRU.
## Building an OS image
Start by installing the
[Debian 9.9 2019-08-03 4GB SD IoT](https://beagleboard.org/latest-images)
image. One may run the image from either a micro-SD card or from
builtin eMMC. If using the eMMC, install it to eMMC now by following
the instructions from the above link.
Then ssh into the Beaglebone machine (`ssh debian@beaglebone` --
password is `temppwd`) and install Klipper by running the following
commands:
```
git clone https://github.com/Klipper3d/klipper
./klipper/scripts/install-beaglebone.sh
```
## Install Octoprint
One may then install Octoprint:
```
git clone https://github.com/foosel/OctoPrint.git
cd OctoPrint/
virtualenv venv
./venv/bin/python setup.py install
```
And setup OctoPrint to start at bootup:
```
sudo cp ~/OctoPrint/scripts/octoprint.init /etc/init.d/octoprint
sudo chmod +x /etc/init.d/octoprint
sudo cp ~/OctoPrint/scripts/octoprint.default /etc/default/octoprint
sudo update-rc.d octoprint defaults
```
It is necessary to modify OctoPrint's **/etc/default/octoprint**
configuration file. One must change the `OCTOPRINT_USER` user to
`debian`, change `NICELEVEL` to `0`, uncomment the `BASEDIR`, `CONFIGFILE`,
and `DAEMON` settings and change the references from `/home/pi/` to
`/home/debian/`:
```
sudo nano /etc/default/octoprint
```
Then start the Octoprint service:
```
sudo systemctl start octoprint
```
Make sure the OctoPrint web server is accessible - it should be at:
[http://beaglebone:5000/](http://beaglebone:5000/)
## Building the micro-controller code
To compile the Klipper micro-controller code, start by configuring it
for the "Beaglebone PRU":
```
cd ~/klipper/
make menuconfig
```
To build and install the new micro-controller code, run:
```
sudo service klipper stop
make flash
sudo service klipper start
```
It is also necessary to compile and install the micro-controller code
for a Linux host process. Configure it a second time for a "Linux process":
```
make menuconfig
```
Then install this micro-controller code as well:
```
sudo service klipper stop
make flash
sudo service klipper start
```
## Remaining configuration
Complete the installation by configuring Klipper and Octoprint
following the instructions in
the main [Installation](Installation.md#configuring-klipper) document.
## Printing on the Beaglebone
Unfortunately, the Beaglebone processor can sometimes struggle to run
OctoPrint well. Print stalls have been known to occur on complex
prints (the printer may move faster than OctoPrint can send movement
commands). If this occurs, consider using the "virtual_sdcard" feature
(see [Config Reference](Config_Reference.md#virtual_sdcard) for
details) to print directly from Klipper.