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Check for GADGET_MODE in boot/firmware to enable

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This commit is contained in:
foley
2026-09-04 10:01:40 +00:00
parent 9c49411159
commit e6a0556147
2 changed files with 39 additions and 22 deletions
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Scripts/gadget.sh
+7
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@@ -9,6 +9,13 @@ if [ $(id -u) -ne 0 ]; then
exit 1
fi
if [ -f /boot/firmware/GADGET_MODE ]; then
systemd-cat -t gadget.sh -p info echo "/boot/firmware/GADGET_MODE exists: GADGET mode enabled"
else
systemd-cat -t gadget.sh -p warning echo "/boot/firmware/GADGET_MODE missing: GADGET mode disabled"
systemctl disable serial-getty@ttyGS0.service
exit 1
fi
# Is the dwc2 overlay installed? Nothing will work if it isn't.
if [ -d /sys/class/udc ] && [ -n "$(ls -A /sys/class/udc)" ]; then
gadget.md
+32 -22
View File
@@ -18,14 +18,6 @@ Make sure you have your USB cable plugged into the left port **USB** and not the
```
sudo su
```
1. Enable the DWC version 2 USB peripheral device tree overlay by appending it to the end after the `[all]` category (which is at the end)
```
echo "dtoverlay=dwc2" >> /boot/firmware/config.txt
```
1. We add the required module `dwc2` for loading at startup
```
echo "dwc2" >> /etc/modules
```
1. Check that we can load the libcomposite module
```
modprobe libcomposite
@@ -94,7 +86,38 @@ This is similar to the procedure for accessing an Arduino.
```
1. Press enter and you will be prompted to log in to the Pi with default credentials. User: pi - PW: raspberry
# Disabling the OTG mode to use a keyboard and mouse again
# Enabling/Disabling the OTG mode to use a keyboard and mouse again
**WARNING: Untested**
1. Disable: Delete a file called `GADGET_MODE` in the boot partition/drive when not on a pi. If the Pi is booted, you can delete `sudo rm /boot/firmware/GADGET_MODE` and reboot
1. Enable: create a file called `GADGET_MODE` in the boot partition/drive when not on a pi. If the Pi is booted, you can create `sudo touch /boot/firmware/GADGET_MODE` and reboot
# Connecting over the USB ethernet to ssh into your Pi
I have not tested this procedure because the serial console and normal network connection is sufficient for me --foley
https://www.raspberrypi.com/news/usb-gadget-mode-in-raspberry-pi-os-ssh-over-usb/
# Untested
Here are items that bear investigating but haven't been tested yet
- [Modify Imager manifest to install otg](https://github.com/raspberrypi/rpi-imager/tree/main/doc/local_json)
# Old DWC Instructions (for older versions)
## Setting up
1. Enable the DWC version 2 USB peripheral device tree overlay by appending it to the end after the `[all]` category (which is at the end)
```
echo "dtoverlay=dwc2" >> /boot/firmware/config.txt
```
1. We add the required module `dwc2` for loading at startup
```
echo "dwc2" >> /etc/modules
```
## Disabling the OTG mode to use a keyboard and mouse again
**WARNING: Untested**
1. Comment out the dwg2 line in `/boot/firmware/config.txt` using a `#` in front of the line
@@ -114,16 +137,3 @@ This is similar to the procedure for accessing an Arduino.
```
systemctl disable serial-getty@ttyGS0.service
```
# Connecting over the USB ethernet to ssh into your Pi
I have not tested this procedure because the serial console and normal network connection is sufficient for me --foley
https://www.raspberrypi.com/news/usb-gadget-mode-in-raspberry-pi-os-ssh-over-usb/
# Untested
Here are items that bear investigating but haven't been tested yet
- [Modify Imager manifest to install otg](https://github.com/raspberrypi/rpi-imager/tree/main/doc/local_json)