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docs: Add a FAQ item on steps to upgrade the software 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2018-01-12 18:38:49 -05:00
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docs/FAQ.md
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@ -10,6 +10,7 @@ Frequently asked questions
7. [Why is the Z position_endstop set to 0.5 in the default configs?](#why-is-the-z-position_endstop-set-to-05-in-the-default-configs)
8. [I converted my config from Marlin and the X/Y axes work fine, but I just get a screeching noise when homing the Z axis](#i-converted-my-config-from-marlin-and-the-xy-axes-work-fine-but-i-just-get-a-screeching-noise-when-homing-the-z-axis)
9. [When I set "restart_method=command" my AVR device just hangs on a restart](#when-i-set-restart_methodcommand-my-avr-device-just-hangs-on-a-restart)
10. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software)
### How do I calculate the step_distance parameter in the printer config file?
@ -191,3 +192,38 @@ flash an updated bootloader to the AVR device. Flashing a new
bootloader is a one time step that typically requires an external
programmer - search the web to find the instructions for your
particular device.
### How do I upgrade to the latest software?
The general way to upgrade is to ssh into the Raspberry Pi and run:
```
cd ~/klipper
git pull
~/klipper/scripts/install-octopi.sh
```
Then one can recompile and flash the micro-controller code. For
example:
```
sudo service klipper stop
make flash FLASH_DEVICE=/dev/ttyACM0
sudo service klipper start
```
However, it's often the case that only the host software changes. In
this case, one can update and restart just the host software with:
```
cd ~/klipper
git pull
sudo service klipper restart
```
If after using this shortcut the software warns about needing to
reflash the micro-controller or some other unusual error occurs, then
follow the full upgrade steps outlined above. Note that the RESTART
and FIRMWARE_RESTART g-code commands do not load new software - the
above "sudo service klipper restart" and "make flash" commands are
needed for a software change to take effect.