Cross-compile a Linux kernel with FunctionFS for the PinePhone running postmarketOS v23.06.

build.sh

#!/bin/sh

set -e

# Setup
sudo apk update
abuild-keygen -a -i -n
cp ~/.abuild/*.rsa.pub /data/out

# Clone Repository
git clone https://gitlab.com/postmarketOS/pmaports.git -b "${PMOS_VERSION}"
cd pmaports
patch -p1 < /data/pmaports.patch

# Build
cd device/main/linux-postmarketos-allwinner
abuild checksum
abuild -r

# Copy Output
cp -r ~/packages /data/out/packages

Dockerfile

# Change this when changing the postmarketOS version!
FROM arm64v8/alpine:3.18

# The postmarketOS Version
ENV PMOS_VERSION="v23.06"

# Use postmarketOS
RUN \
    echo "https://mirror.postmarketos.org/postmarketos/${PMOS_VERSION}" > temp && \
    cat /etc/apk/repositories >> temp && \
    cat temp > /etc/apk/repositories && \
    rm -f temp && \
    apk add --update --no-cache --no-progress --allow-untrusted postmarketos-keys

# Install Dependencies
RUN apk add --update --no-cache --no-progress alpine-sdk git sudo

# Create User
RUN \
    addgroup -g 1000 user && \
    adduser -D -u 1000 -G user -s /bin/bash user && \
    adduser user abuild && \
    echo 'user ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers

# Switch To User
USER user
WORKDIR /home/user

pmaports.patch

--- a/device/main/linux-postmarketos-allwinner/APKBUILD
+++ b/device/main/linux-postmarketos-allwinner/APKBUILD
@@ -32,7 +32,7 @@ options="!strip !check !tracedeps
 	pmb:cross-native
 	pmb:kconfigcheck-community
 	"
-source="$pkgname-$_tag.tar.gz::https://github.com/megous/linux/archive/$_tag.tar.gz
+source="$pkgname-$_tag.tar.gz::https://codeberg.org/megi/linux/archive/$_tag.tar.gz
 	config-$_flavor.aarch64
 	config-$_flavor.armv7
 	0001-dts-add-dontbeevil-pinephone-devkit.patch
@@ -48,7 +48,7 @@ source="$pkgname-$_tag.tar.gz::https://github.com/megous/linux/archive/$_tag.tar
 	0011-sunxi-mmc-h6-fix.patch
 	0012-arm64-dts-allwinner-orangepi-3-fix-ethernet.patch
 	"
-builddir="$srcdir/linux-$_tag"
+builddir="$srcdir/linux"
 
 case "$CARCH" in
 	aarch64*) _carch="arm64" ;;
--- a/device/main/linux-postmarketos-allwinner/config-postmarketos-allwinner.aarch64
+++ b/device/main/linux-postmarketos-allwinner/config-postmarketos-allwinner.aarch64
@@ -4442,7 +4442,7 @@ CONFIG_USB_CONFIGFS_F_TCM=y
 # CONFIG_USB_ETH is not set
 # CONFIG_USB_G_NCM is not set
 # CONFIG_USB_GADGETFS is not set
-# CONFIG_USB_FUNCTIONFS is not set
+CONFIG_USB_FUNCTIONFS=m
 # CONFIG_USB_MASS_STORAGE is not set
 # CONFIG_USB_GADGET_TARGET is not set
 # CONFIG_USB_G_SERIAL is not set

run.sh

#!/bin/sh

set -e

# Build Docker Image
docker build -t pinephone-kernel-build .

# Create Output Directory
rm -rf out
mkdir out

# Run
docker run --rm -v "$(pwd):/data" pinephone-kernel-build /data/build.sh