VersaNode OS – Kernel-level mods Pi-gen stage

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🔧 Overview

The VersaNode OS Kernel-level Mod Stage enables I²C, SPI, and 1‑Wire interfaces and drops a udev rule — all without using on_chroot. Every modification is applied directly to ${ROOTFS_DIR}, making it safe for automated builds and reproducible images.

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🚀 What It Does

• Adds or updates the following entries in ${ROOTFS_DIR}/boot/firmware/config.txt:

  dtparam=i2c_arm=on
  dtparam=spi=on
  dtoverlay=w1-gpio

• Installs I/O toolchain packages via 00-packages (handled automatically by pi-gen):
  • i2c-tools
  • python3-smbus
  • spi-tools
• Drops a udev rule to grant the plugdev group access to I2C and SPI device nodes.

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📂 File Structure

stage2-kmods/
  00-versanode-bus-io/
    00-packages
    00-run.sh
    files/
      etc/udev/rules.d/99-versa-bus.rules

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♻️ Notes

• Idempotent: re-runs won’t duplicate lines in config.txt.
• Compatible with both Raspberry Pi OS Lite and custom pi-gen derivatives.
• No root filesystem mounting tricks required — everything is path-relative.