Files
start-os/build/image-recipe/raspberrypi/squashfs/boot/config.sh
Aiden McClelland dba1cb93c1 feat: raspberry pi U-Boot + GPT + btrfs boot chain
Switch Raspberry Pi builds from proprietary firmware direct-boot to a
firmware → U-Boot → GRUB → kernel chain using GPT partitioning:

- GPT partition layout with fixed UUIDs matching os_install: firmware
  (128MB), ESP (100MB), boot (2GB FAT32), root (btrfs)
- U-Boot as the kernel in config.txt, chainloading GRUB EFI
- Pi-specific GRUB config overrides (console, USB quirks, cgroup)
- Btrfs root with shrink-to-minimum for image compression
- init_resize.sh updated for GPT (sgdisk -e) and btrfs resize
- Removed os-partitions from config.yaml (now derived from fstab)
2026-03-12 11:12:04 -06:00

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#!/bin/sh
cat << EOF
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
# Automatically load overlays for detected cameras
camera_auto_detect=1
# Automatically load overlays for detected DSI displays
display_auto_detect=1
# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2
# Run in 64-bit mode
arm_64bit=1
# Disable compensation for displays with overscan
disable_overscan=1
[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1
[pi4]
# Run as fast as firmware / board allows
arm_boost=1
[all]
gpu_mem=16
dtoverlay=pwm-2chan,disable-bt
# Enable UART for U-Boot and serial console
enable_uart=1
# Load U-Boot as the bootloader (GRUB is chainloaded from U-Boot)
kernel=u-boot.bin
EOF