Linux patches from CIX for mainline

This repository provides a patch set for the mainline version of the Linux kernel.

Overview

Kernel version	Patch dir	Kernel config	Comments
v6.18.x	patches-6.18	config/config-6.18.defconfig	This will track the latest LTS version of kernel
v7.0	patches-7.0	config/config-7.0.defconfig	This will track the latest tag of linux mainline

Hardware/Firmware requirements

• Orion O6 is tested with edk2 firmware 1.2.1
• There are two necessary commits if you are using edk2 source code based on 2025Q4 release from other vendor: Add reg-io-width property for SCMI shmem, Platform/Radxa: add SCMI toggle
• Device Manager -> O/S Hardware Description Selection has to be set to ACPI
• The following option has to be enabled in UEFI: Device Manager -> Platform Configuration -> Compliance Configuratuin -> Enable ACPI SCMI

Support status

hardware components	Status	Notes
Typec DP Display	DP alt mode works	USB C port near the power button has issues when rendering videos decoded by vpu via GL(Tested with clapper playing fullscreen video).
DP Display	Supported	DP has issues when rendering videos decoded by vpu via GL(Tested with clapper playing fullscreen video).
HDMI Display	Supported	HDMI has issues when rendering videos decoded by vpu via GL(Tested with clapper playing fullscreen video).
DP Sound	TODO
Headphone jack	Supported
GPU	Supported
VPU	Supported via external DKMS
NPU	Supported via external DKMS
USB	Supported
PCIE	Works without patches

Build kernel

This is an example of building kernel with patches and kernel config of v7.0 on a native arm64 machine.

# Clone this repo
git clone https://github.com/cixtech/cix-linux-main

# Clone kernel source code
git clone --depth 1 https://github.com/torvalds/linux.git -b v7.0-rc4

# Get into source dir
cd linux

# Create a branch for development
git branch dev-7.0 && git checkout dev-7.0

# Apply patches
git am ../cix-linux-main/patches-7.0/*.patch

# Copy kernel config
cp ../cix-linux-main/config/config-7.0.defconfig .config

# Make oldconfig
make olddefconfig

# Build kernel deb
make -j$(nproc) bindeb-pkg

Kernel parameters

There are following kernel parameters which are necessary for booting kernel:

• clk_ignore_unused

Kernel firmware

Kernel driver	firmware file
panthor	firmware of gpu is available in upstream linux-firmware repo since 20250808
dsp remoteproc	dsp_fw.bin is available at github repo of cixtech

Userspace driver

kernel space driver	userspace driver
panthor	mesa since v25.1 supported by upstream MR