linux-sky1

Linux kernel patches and configuration for CIX Sky1 SoC (Radxa Orion O6 and compatible boards).

Overview

This repository contains the Sky1 kernel patch set and configuration for 4 kernel tracks:

Track	Patches	Config	Base	APT Component
LTS	patches/	config.sky1	v6.18.x	main
Latest	patches-latest/	config.sky1-latest	v6.19.x	latest
RC	patches-rc/	config.sky1-rc	v6.X-rcN	rc
Next	patches-next/	config.sky1-next	origin/master	next

Repository Structure

linux-sky1/
├── patches/                    # LTS track (6.18.x)
│   ├── 0001-*.patch
│   └── ...
├── patches-latest/             # Latest stable track (6.19.x)
├── patches-rc/                 # RC track (pre-release)
├── patches-next/               # Next track (origin/master)
├── config/
│   ├── config.sky1             # LTS config
│   ├── config.sky1-latest      # Latest config
│   ├── config.sky1-rc          # RC config
│   ├── config.sky1-next        # Next config
│   ├── config-policy.ini       # Cross-track policy enforcement
│   ├── diff-kernel-config.sh   # Config comparison tool
│   └── README.md               # Config documentation
└── CHANGELOG.md                # Patch set version history

Supported Hardware

• SoC: CIX CD8180 (Sky1)
• Boards: Radxa Orion O6, Radxa Orion O6N (micro-ITX)
• GPU: Mali-G720-Immortalis (via Panthor driver)
• Display: DisplayPort via linlon-dp/trilin-dpsub

Using These Patches

Apply to Kernel Source

# Download kernel (replace with current LTS version)
wget https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.18.x.tar.xz
tar xf linux-6.18.x.tar.xz
cd linux-6.18.x

# Apply patches
for p in /path/to/linux-sky1/patches/*.patch; do
    patch -p1 < "$p"
done

# Use config
cp /path/to/linux-sky1/config/config.sky1 .config
make ARCH=arm64 olddefconfig

Build Kernel

make ARCH=arm64 -j$(nproc) Image modules dtbs

Patch Categories

#	Patch	Description
01	arm64: dts: cix	Sky1 SoC and Radxa Orion O6/O6N device trees
02	pci: cadence	PCIe host controller, ATU, MSI, hotplug, I/O windows
03	arm64: cix: infrastructure	SCMI, mailbox, pinctrl, clock, reset, hwspinlock, eFuse, SoC info
04	usb: phy	CDNSP, RTS5453 Type-C PD, USBDP PHYs
05	drm: cix: display	linlon-dp, trilin-dpsub display drivers
06	drm/panthor	GPU support for Mali-G720-Immortalis (ACE-Lite bus coherency, DVFS)
07	sound: audio	HDA, DMA-350, DSP drivers
08	net	Realtek RTL8126 5GbE and RTL8125 2.5GbE drivers
09	misc: armchina-npu	Zhouyi NPU driver
10	media: cix: vpu	Video codec (amvx) driver
11	irqchip, iommu, perf	PDC, SMMU boot-active streams, ARM SPE heterogeneous CPU
12	arm64: cix: misc	Thermal, PWM, watchdog, DDR LP, bus DVFS, CPU IPA, cpufreq

Installing Pre-built Packages

Pre-built kernel packages are available from the Sky1 Linux apt repository:

# Add repository key
wget -qO- https://sky1-linux.github.io/apt/key.gpg | sudo tee /usr/share/keyrings/sky1-linux.asc > /dev/null

# Add repository (LTS only — default)
echo "deb [signed-by=/usr/share/keyrings/sky1-linux.asc] https://sky1-linux.github.io/apt sid main" | \
    sudo tee /etc/apt/sources.list.d/sky1-linux.list

# Or add additional tracks:
#   sid main latest          — LTS + Latest stable
#   sid main latest rc       — LTS + Latest + RC testing
#   sid main latest rc next  — All tracks (bleeding edge)

# Install kernel
sudo apt update
sudo apt install linux-image-sky1 sky1-firmware

Verifying Your Config

If you're building a custom kernel, verify your config has all required options:

curl -fsSL https://raw.githubusercontent.com/Sky1-Linux/linux-sky1/main/config/diff-kernel-config.sh | bash

This checks for missing required options and shows differences from the Sky1 default.

Documentation

• Kernel Configuration Guide - Essential vs optional configs for Sky1

Config Management

Config options can be set across all tracks, policy, and documentation with a single command:

# Set an option across all tracks (dry-run by default)
~/sky1-linux-distro/sky1-linux-build/scripts/manage-config.py set USB_UAS=m \
    --policy usb --doc "USB Support" --type module --desc "USB Attached SCSI" --apply

# Show current state of an option
~/sky1-linux-distro/sky1-linux-build/scripts/manage-config.py show USB_UAS

# Validate all tracks against policy
~/sky1-linux-distro/sky1-linux-build/scripts/reconcile-configs.py

See config/README.md for full details.

Related Repositories

• sky1-linux-build - Build scripts and development tools
• apt - APT repository
• sky1-firmware - Firmware packages

License

• Kernel patches: GPL-2.0 (same as Linux kernel)