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Raspberry Pi

These configurations target the Raspberry Pi family of boards.

Board Compatibility

There are specific packages tuned to each Pi model.

Board Config Package
Pi 0 pi/0
Pi 1 pi/1
Pi 2 pi/3
Pi 3 pi/3
Pi 4 pi/4x64 or pi/4
Pi 4 - 32bit pi/4x32

Building an Image

It's possible to create a .img file instead of directly flashing a SD.

# must be root to use losetup
sudo bash
# set your skiff workspace
export SKIFF_WORKSPACE=default
# set the output path
export PI_IMAGE=./pi-image.img
# make the image
make cmd/pi/common/buildimage

The image can then be flashed to the target:

# change sdX to, for example, sdb
dd if=pi-image.img of=/dev/sdX status=progress oflag=sync

This is equivalent to using the format and install scripts.

The persist partition will be resized to fill the available space on first boot.

Note: config.txt

You can override the config.txt. Simply copy the "resources/rpi" directory from the pi/common configuration into your own configuration package, for example: "mypackage/resources/rpi/config.txt"

Note: dtoverlay config.txt

Upstream adds dtoverlay=miniuart-bt to the config.txt, which should "fix ttyAMA0 serial console.

Note: 64 bit kernel

The pi/4x64 configuration uses a 64 bit kernel with an alternate config.txt, which specifies arm_64bit as required.

Raspbian does not use 64 bit yet and many of the video drivers don't work with aarch64 yet.

According to the Gentoo wiki:

The Raspberry Pi closed source VC4 driver is not available on 64-bit (ARM64/AARCH64) systems. The Raspberry Pi foundation has stated "we are not working on this, and are unlikely to do so in the near future". Using the open source vc4-fkms-v3d driver listed below instead is recommended.

References:

Overclocking

You will want to follow the upstream guidance on overclocking:

https://www.raspberrypi.org/documentation/configuration/config-txt/overclocking.md

Add the following snippet at the end of config.txt for a quick start. WARNING! This will set a permanent bit on your Pi which will mark it as having been overclocked. This will most-likely void the warranty.

over_voltage=4
force_turbo=1
max_usb_current=1

Config.txt Conditional Sections

The config.txt file supports conditional sections:

  • [pi1]: Model A, Model B, Compute Module
  • [pi2]: Model 2B (BCM2836- or BCM2837-based)
  • [pi3]: Model 3B, Model 3B+, Model 3A+, Compute Module 3
  • [pi3+]: Model 3A+, Model 3B+
  • [pi4]: Model 4B
  • [pi0]: Zero, Zero W, Zero WH
  • [pi0w]: Zero W, Zero WH