Begin of the Nexus 5 hammerhead port

device-lg-hammerhead/90-android-touch-dev.rules

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+# use 'weston-calibrator' to calibrate the touchscreen!
+SUBSYSTEM=="input", ATTRS{name}=="touch_dev", \
+ENV{ID_INPUT}="1", ENV{ID_INPUT_TOUCHSCREEN}="1" \
+ENV{WL_CALIBRATION}="0.982113 -0.006129 1.983124 -0.002560 1.000800 -6.012451"
+

device-lg-hammerhead/initfs-hook.sh

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+#!/bin/sh
+
+# set framebuffer resolution
+cat /sys/class/graphics/fb0/modes > /sys/class/graphics/fb0/mode

device-lg-hammerhead/profile.sh

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+#!/bin/sh
+
+# Dirty hacks, necessary to get a working demo...
+if [ -e /etc/xdg/weston/weston.ini ]; then
+	rm /etc/xdg/weston/weston.ini
+	echo "WARNING: xwayland does not work yet on lg-mako (probably"
+	echo "because of bad framebuffer drivers)"
+	echo "=> Deleted /etc/xdg/weston/weston.ini as workaround"
+fi
+if [ -e /lib/udev/v4l_id ]; then
+	mv /lib/udev/v4l_id /lib/udev/v4l_id_
+	echo "WARNING: v4l_id hangs with the current kernel."
+	echo "=> Moved it from /lib/udev/v4l_id to /lib/udev/v4l_id_"
+fi
+
+
+# Run a few weston demos, because the postmarketos-demos program depends
+# on xwayland for now (Alpine's GTK3 isn't configured for Wayland
+# support yet.)
+if [ $(tty) = "/dev/tty1" ]; then
+	(
+		sleep 3;
+		export XDG_RUNTIME_DIR=/tmp/0-runtime-dir
+		weston-smoke &
+		weston-simple-damage &
+		weston-editor &
+		weston-terminal --shell=/usr/bin/htop &
+	) > /dev/null &
+fi
+

linux-lg-hammerhead/APKBUILD

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+# APKBUILD based on linux-vanilla aport. Changes:
+# - disabled module installation
+# - add !check !tracedeps
+# - package: just install zimage and kernel.release, because the kernel config
+#	does not generate modules or dtb files
+# - do not create -dev subpackage (makes no sense without module support)
+#
+# Kernel config based on: arch/arm/configs/lineageos_mako_defconfig
+# Changes:
+# - enable devtmpfs (needed for udev -> touch support in weston)
+
+_vendor=lg
+_flavor=lg-hammerhead
+_hash="v4.11"
+_config="config-${_flavor}.armhf"
+
+pkgname=linux-${_flavor}
+pkgver=4.11
+case $pkgver in
+	*.*.*)  _kernver=${pkgver%.*};;
+	*.*) _kernver=$pkgver;;
+esac
+pkgrel=3
+arch="armhf"
+pkgdesc="Linux 4.11 with hammerhead config"
+url="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?qt=grep&q=hammerhead"
+depends="postmarketos-mkinitfs"
+makedepends="perl sed installkernel bash gmp-dev bc linux-headers elfutils-dev"
+options="!strip !check !tracedeps"
+install=
+source="
+	https://github.com/torvalds/linux/archive/${_hash}.zip
+	$_config
+"
+subpackages=""
+license="GPL2"
+
+_abi_release=${pkgver}
+_carch="arm"
+HOSTCC="${CC:-gcc}"
+HOSTCC="${HOSTCC#${CROSS_COMPILE}}"
+
+ksrcdir="$srcdir/linux-${pkgver}"
+
+prepare() {
+	local _patch_failed=
+	cd "$ksrcdir"
+
+	# first apply patches in specified order
+	for i in $source; do
+		case $i in
+		*.patch)
+			msg "Applying $i..."
+			if ! patch -s -p1 -N -i "$srcdir"/$i; then
+				echo $i >>failed
+				_patch_failed=1
+			fi
+			;;
+		esac
+	done
+
+	if ! [ -z "$_patch_failed" ]; then
+		error "The following patches failed:"
+		cat failed
+		return 1
+	fi
+
+	# gcc6 support
+	# cp -v "$srcdir/compiler-gcc6.h" "$ksrcdir/include/linux/"
+
+	mkdir -p "$srcdir"/build
+	cp "$srcdir"/$_config "$srcdir"/build/.config || return 1
+	rm "$ksrcdir"/arch/arm/boot/dts/include/dt-bindings
+	ln -s "$ksrcdir"/include/dt-bindings "$ksrcdir"/arch/arm/boot/dts/include/
+	make -C "$ksrcdir" O="$srcdir"/build ARCH="$_carch" HOSTCC="$HOSTCC" CROSS_COMPILE=arm-linux-gnueabi- \
+		silentoldconfig
+}
+
+
+
+# this is so we can do: 'abuild menuconfig' to reconfigure kernel
+menuconfig() {
+	cd "$srcdir"/build || return 1
+	make ARCH="$_carch" menuconfig
+	cp .config "$startdir"/$_config
+}
+
+build() {
+	cd "$srcdir"/build
+	unset LDFLAGS
+	make ARCH="$_carch" CC="${CC:-gcc}" \
+		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine" \
+		|| return 1
+}
+
+package() {
+	install -Dm644 "$srcdir/build/arch/arm/boot/zImage" \
+		"$pkgdir/boot/vmlinuz-$_flavor"
+
+	install -D "$srcdir/build/include/config/kernel.release" \
+		"$pkgdir/usr/share/kernel/$_flavor/kernel.release"
+}
+
+sha512sums="bfce6c290a7d372a018599fb835800a2cb5c3488883f4bd55c78b2197c6fb9420a8ac2f7740c054330948c62f0ffeafccdd386b6b57e8e4e794a74abb0ff12f6  v4.11.zip
+ab220bd127daf0eb3b97279d6f050b520a0cf51c7f25ac2dae3ad038644344dbbe42a62fc8a258f4be1cedc5713ffff479bdbc8ea4c13974b67988f4f7fcd02a  config-lg-hammerhead.armhf"

linux-lg-hammerhead/compiler-gcc6.h

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+// SOURCE:
+// https://github.com/NextThingCo/CHIP-u-boot/issues/10#issuecomment-287515505
+
+#ifndef __LINUX_COMPILER_H
+#error "Please don't include <linux/compiler-gcc6.h> directly, include <linux/compiler.h> instead."
+#endif
+
+#define __used				__attribute__((__used__))
+#define __must_check			__attribute__((warn_unused_result))
+#define __compiler_offsetof(a, b)	__builtin_offsetof(a, b)
+
+/* Mark functions as cold. gcc will assume any path leading to a call
+   to them will be unlikely.  This means a lot of manual unlikely()s
+   are unnecessary now for any paths leading to the usual suspects
+   like BUG(), printk(), panic() etc. [but let's keep them for now for
+   older compilers]
+
+   Early snapshots of gcc 4.3 don't support this and we can't detect this
+   in the preprocessor, but we can live with this because they're unreleased.
+   Maketime probing would be overkill here.
+
+   gcc also has a __attribute__((__hot__)) to move hot functions into
+   a special section, but I don't see any sense in this right now in
+   the kernel context */
+#define __cold			__attribute__((__cold__))
+
+#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
+
+#ifndef __CHECKER__
+# define __compiletime_warning(message) __attribute__((warning(message)))
+# define __compiletime_error(message) __attribute__((error(message)))
+#endif /* __CHECKER__ */
+
+/*
+ * Mark a position in code as unreachable.  This can be used to
+ * suppress control flow warnings after asm blocks that transfer
+ * control elsewhere.
+ *
+ * Early snapshots of gcc 4.5 don't support this and we can't detect
+ * this in the preprocessor, but we can live with this because they're
+ * unreleased.  Really, we need to have autoconf for the kernel.
+ */
+#define unreachable() __builtin_unreachable()
+
+/* Mark a function definition as prohibited from being cloned. */
+#define __noclone	__attribute__((__noclone__))
+
+/*
+ * Tell the optimizer that something else uses this function or variable.
+ */
+#define __visible __attribute__((externally_visible))
+
+/*
+ * GCC 'asm goto' miscompiles certain code sequences:
+ *
+ *   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
+ *
+ * Work it around via a compiler barrier quirk suggested by Jakub Jelinek.
+ *
+ * (asm goto is automatically volatile - the naming reflects this.)
+ */
+#define asm_volatile_goto(x...)	do { asm goto(x); asm (""); } while (0)
+
+#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP
+#define __HAVE_BUILTIN_BSWAP32__
+#define __HAVE_BUILTIN_BSWAP64__
+#define __HAVE_BUILTIN_BSWAP16__
+#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
+