google-x64cros: new device

This is my initial attempt at a generic port for x86_64 Chromebooks. It's mostly a copy of tablet-x64uefi with the addition of a ChromeOS kernel partition. I'm keeping the grub parts so it's still bootable with MrChromebox's firmware as noted in the wiki.

Unlike ARM boards the bootloader specifics don't seem to change much between x86 devices, but that's an educated guess at best as I only tested on one I have. There is a 8/16/32/512M size limit based on board's age. Currently the vmlinuz.kpart is at a nice ~10.5M. I set the kernel partition size to 16M to make sure things loudly break if we ever exceed that. (It would immediately jump to >70M so 32M doesn't make sense for that.)

Some issues:

• FDE with unl0kr doesn't boot at all. (Missing modules)
• Coreboot framebuffer doesn't work (maybe for FDE unlocking; or put i915 etc in initramfs-extra?)
• Choosing linux-lts as kernel somehow uses vmlinuz-edge in grub.cfg
• Suspend makes the firmware go into recovery, forces internal boot (Need to enable TPM drivers in kernels)
• There are reports of people damaging the speakers while tinkering with audio stuff on various Chromebooks (even ARM ones). I'm not sure if the default configuration is safe for all, mine happened to work fine.

There's a LOT of x86 Chromebooks, I'd appreciate more testing.

device/testing/device-google-x64cros/APKBUILD

+# Reference: <https://postmarketos.org/devicepkg>
+# Maintainer: Alper Nebi Yasak <alpernebiyasak@gmail.com>
+pkgname=device-google-x64cros
+pkgdesc="Google Chromebooks with x64 CPU"
+pkgver=1
+pkgrel=0
+url="https://postmarketos.org"
+license="MIT"
+arch="x86_64"
+# pmb:strict: avoid grub-related install error during build with pmbootstrap
+options="!check !archcheck pmb:strict"
+depends="
+	alsa-ucm-conf
+	sof-bin
+	postmarketos-base
+	depthcharge-tools
+	postmarketos-update-depthcharge-kernel
+	"
+makedepends="
+	devicepkg-dev
+	grub
+	grub-efi
+	"
+subpackages="
+	$pkgname-libva
+	$pkgname-kernel-lts:kernel_lts
+	$pkgname-kernel-edge:kernel_edge
+	$pkgname-vulkan
+	"
+source="
+	deviceinfo
+	grub_early.cfg
+	grub_edge.cfg
+	grub_lts.cfg
+	"
+
+build() {
+	devicepkg_build $startdir $pkgname
+
+	grub-mkimage \
+		--config="$srcdir/grub_early.cfg" \
+		--prefix="" \
+		--output="bootx64.efi" \
+		--format="x86_64-efi" \
+		--compression="xz" \
+		\
+		all_video \
+		cat \
+		configfile \
+		disk \
+		echo \
+		efi_gop \
+		fat \
+		gzio \
+		help \
+		iso9660 \
+		linux \
+		ls \
+		normal \
+		part_gpt \
+		part_msdos \
+		search \
+		search_label \
+		test \
+		true
+}
+
+package() {
+	devicepkg_package $startdir $pkgname
+
+	install -Dm644 "$srcdir"/bootx64.efi \
+		"$pkgdir"/boot/EFI/Boot/bootx64.efi
+}
+
+libva() {
+	install_if="$pkgname libva"
+	depends="intel-media-driver libva-intel-driver"
+	mkdir "$subpkgdir"
+}
+
+kernel_edge() {
+	pkgdesc="Alpine Edge kernel"
+	depends="linux-edge"
+	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
+
+	install -Dm644 "$srcdir"/grub_edge.cfg \
+		"$subpkgdir"/boot/grub/grub.cfg
+}
+
+kernel_lts() {
+	pkgdesc="Alpine LTS kernel"
+	depends="linux-lts"
+	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
+
+	install -Dm644 "$srcdir"/grub_lts.cfg \
+		"$subpkgdir"/boot/grub/grub.cfg
+}
+
+vulkan() {
+	install_if="$pkgname vulkan-loader"
+	depends="mesa-vulkan-intel"
+	mkdir "$subpkgdir"
+}
+
+sha512sums="
+f7a3d88cf462a3adda84e7e14483df53e4034a8af26fae0c89af337a997a653f2c56bd485b33957916e5e8b89b6c1e5f6ae4478afe04a3a700b0374a80cd61d9  deviceinfo
+0f9357d4eea089628fbceb1e3e96d21a3f4329aeb6743158a6f877f967ef274506404eba949d5f01b7e1adea149f9a3aef992a5e8cd4181f93ab00909b1c5ecd  grub_early.cfg
+1fcae6891028bc07051e6e6faf9dd3ec2304c6165f9df05198f28a7fa2ba85c1dd8d07b72a5122d9628b67a2b0096ac180a9a2de0f391f9ce850c07dc79ac857  grub_edge.cfg
+e15beaf385a350a7c36be249cf9495e4622f7888c8def6ac47359ebd2ef2c994f954abec8ccb16b402269f949e6f6016d41711e6596f46ba3dad240f84ba163f  grub_lts.cfg
+"