incuvers-inc / pi-gadget

Universal pi (pi2,pi3,pi4,cm3) gadget snap for core18

Raspberry Pi "Universal" Gadget Snap

This repository contains the source for an Ubuntu Core gadget snap that runs universally on all Raspberry Pi 3 boards currently supported by Ubuntu Core (the Raspberry Pi 2B, 3B, 3A+, 3B+, 4B, Compute Module 3, and Compute Module 3+).

Building it with snapcraft will obtain various components from the bionic-updates archive, including:

• the bootloader firmware from the linux-firmware-raspi2 package
• the device-tree(s) from the linux-modules--raspi2 package
• u-boot binaries (for various models) from the u-boot-rpi package
• u-boot boot script from the flash-kernel package (classic gadgets only)

On core builds, a silent boot with a splash screen is included. The splash screen binary comes from git://git.yoctoproject.org/psplash. Please see the psplash/ sub directory for patches and adjustments in use.

Gadget Snaps

Gadget snaps are a special type of snaps that contain device specific support code and data. You can read more about them in the snapcraft forum: https://forum.snapcraft.io/t/the-gadget-snap/

Reporting Issues

Please report all issues here on the github page via: https://github.com/snapcore/pi-gadget/issues

Branding

This gadget snap comes with a boot splash. To change the logo you can add a new png file to the psplash subdirectory of this tree, adjust the "SPLASH=" option in psplash/config to point to this file and rebuild the gadget.

To turn off the splash screen completely please edit configs/core/cmdline.txt and remove the splash and the vt.handoff=2 keywords from the default kernel commandline.

Building

This gadget snap can optionally be cross built on an amd64 machine. To do so, just run snapcraft with an appropriate --target-arch switch, and --destructive-mode in the top level of the source tree after cloning it and selecting the appropriate branch:

$ sudo snap install snapcraft --classic
$ git clone https://github.com/snapcore/pi-gadget
$ cd pi-gadget
$ git checkout 18-arm64
$ sudo snapcraft clean --destructive-mode
$ sudo snapcraft snap --target-arch=arm64 --destructive-mode

The branches included are:

• 18-arm64 - the branch for Core 18 on arm64
• 18-armhf - the branch for Core 18 on armhf
• classic - the branch for Ubuntu (universal gadget)