Ethtool on gateway OS and read only mode

greg · August 11, 2019, 9:34am

Hi,

When i connect my raspberry PI 3 B+ with my POE Splitter, the first task i need to do in order
to get ethernet working is the following

sudo apt-get install ethtool
sudo ethtool -s eth0 speed 100 duplex full
sudo ethtool eth0

How can i achieve the same with this non-debian based distribution (which distry btw ? )

Also , in order to avoid sd card corruuption , i usually run this script :

github.com

adafruit/Raspberry-Pi-Installer-Scripts/blob/master/read-only-fs.sh

#!/bin/bash

# CREDIT TO THESE TUTORIALS:
# petr.io/en/blog/2015/11/09/read-only-raspberry-pi-with-jessie
# hallard.me/raspberry-pi-read-only
# k3a.me/how-to-make-raspberrypi-truly-read-only-reliable-and-trouble-free

if [ $(id -u) -ne 0 ]; then
	echo "Installer must be run as root."
	echo "Try 'sudo bash $0'"
	exit 1
fi

clear

echo "This script configures a Raspberry Pi"
echo "SD card to boot into read-only mode,"
echo "obviating need for clean shutdown."
echo "NO FILES ON THE CARD CAN BE CHANGED"
echo "WHEN PI IS BOOTED IN THIS STATE. Either"

This file has been truncated. show original

which put the whole filesystem in read only mode, leaving some partitions in ram.
Is it fine running this script against gateway OS?

Thanks a lot

greg · August 13, 2019, 9:22am

anyone please It’s really a blocker in my project

brocaar · August 13, 2019, 12:12pm

I’m not sure about the ethtool command that you need to execute in order to get PoE working (after a quick search I found that this is a workaround).

To answer your other question, the LoRa Gateway OS uses a read-only filesystem by default and writes changes to the /data partition (using an OverlayFS).

greg · August 13, 2019, 2:31pm

Hi , @brocaar thanks for your answer, i was curious which was your base distribution for this gateway os ?
as there is so apt, yum package available.

i tried apt, aptitude, dpkg, yum, rpm, packman, apk, no joy. there is no gcc, g++, make etc…, i start wondering if there is any way to install anything on it Because without this ethtool installed, i won’t simply be able to use it anymore

Thanks a lot

Tony · August 13, 2019, 9:12pm

its strange you need to do this as the Ethernet port should be working as normal. I designed and built my own PoE power supply on a Pi3B+ and RAK831 and it works as standard.

Could you describe the PoE Splitter you are using.
Any idea if it’s the PoE splitter causing the problem with eth0

greg · August 13, 2019, 10:55pm

i ordered this one:
https://www.amazon.de/gp/product/B01H37XQP8/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Seems that is a classic workaround to get PI 3 B+ to work with such splitter as i see this trick around internet quite a few times, especially on comments from amazon buyers

brocaar · August 14, 2019, 8:10am

What you probably want (/ need) to do is build your own LoRa Gateway OS image. You can see the Gateway OS as a distribution on its own, it is built from scratch using the Yocto project.

See https://github.com/brocaar/lora-gateway-os/ for more information.

To add additional packages to the image (either the -base or -full), edit one of these files: https://github.com/brocaar/lora-gateway-os/tree/master/layers/targets/meta-raspberrypi/recipes-core/images

The package you want to add: https://layers.openembedded.org/layerindex/recipe/90014/.

For documentation on using Yocto, see: https://www.yoctoproject.org/docs/2.7/ref-manual/ref-manual.html.

greg · August 14, 2019, 12:56pm

Thanks @brocaar for your help, awesome, this will do the job ^^