surftab-wintron7.0: new device (TrekStor Surftab wintron 7.0) (!290)

This device is x86_64 and has a 32-bit UEFI, so I need to install
32-bit grub (AFAIK it's the only bootloader capable of loading a 64-bit
kernel from 32-bit).

The grub-efi-x86 package has been generated with pmbootstrap.

cross/grub-efi-x86/APKBUILD

+# Automatically generated aport, do not edit!
+# Generator: pmbootstrap aportgen grub-efi-x86
+
+pkgname=grub-efi-x86
+pkgver=2.02
+pkgrel=14
+
+_arch="x86"
+_mirror="http://dl-cdn.alpinelinux.org/alpine/"
+
+pkgdesc="GRUB $_arch EFI files for every architecture"
+url="https://www.gnu.org/software/grub/"
+license="GPL-3.0-or-later"
+arch="all"
+source="grub-efi-$pkgver-r$pkgrel-$_arch.apk::$_mirror/edge/main/$_arch/grub-efi-$pkgver-r$pkgrel.apk"
+
+package() {
+    mkdir -p "$pkgdir"
+    cd "$pkgdir"
+    tar -xf "$srcdir/grub-efi-$pkgver-r$pkgrel-$_arch.apk"
+    rm .PKGINFO .SIGN.*
+}
+
+sha512sums="ed9fa2d18e4af5916671a0ca316471b0def4ec1de7358b04e9a1c92693170bd8e24688d9926871c121201f1a3efc618ff1f90630d14f7f06527423e65d597405  grub-efi-2.02-r14-x86.apk"

cross/grub-x86/APKBUILD

+pkgname=grub-x86
+pkgver=1
+pkgrel=0
+pkgdesc="GRUB i386-efi image"
+url="https://www.gnu.org/software/grub/"
+license="GPL-3.0-or-later"
+arch="x86_64"
+makedepends="grub grub-efi-x86"
+options="pmbootstrap-strict"
+source="grub_early.cfg"
+
+package() {
+    mkdir -p "$pkgdir/boot/EFI/Boot"
+    grub_mod="all_video disk part_gpt part_msdos linux normal configfile search search_label efi_gop fat iso9660 cat echo ls test true help gzio"
+    grub-mkimage --config="$srcdir/grub_early.cfg" \
+        --prefix="" \
+        --output="$pkgdir/boot/EFI/Boot/bootia32.efi" \
+        --format="i386-efi" --compression="xz" \
+        $grub_mod
+}
+
+sha512sums="0f9357d4eea089628fbceb1e3e96d21a3f4329aeb6743158a6f877f967ef274506404eba949d5f01b7e1adea149f9a3aef992a5e8cd4181f93ab00909b1c5ecd  grub_early.cfg"

cross/grub-x86/grub_early.cfg

+search --no-floppy --set=root --label "pmOS_boot"
+set prefix=($root)/grub

device/device-surftab-wintron7.0/APKBUILD

+# Reference: <https://postmarketos.org/devicepkg>
+pkgname="device-surftab-wintron7.0"
+pkgdesc="TrekStor SurfTab wintron 7.0"
+pkgver=0.3
+pkgrel=1
+url="https://postmarketos.org"
+license="MIT"
+arch="x86_64"
+options="!check !archcheck"
+depends="grub-x86 postmarketos-base linux-vanilla mesa-dri-intel"
+makedepends="devicepkg-dev"
+subpackages="$pkgname-nonfree-firmware:nonfree_firmware"
+source="
+	deviceinfo
+	grub.cfg
+"
+
+build() {
+	devicepkg_build $startdir $pkgname
+}
+
+package() {
+	devicepkg_package $startdir $pkgname
+	mkdir -p "$pkgdir/boot/grub/"
+	install -D -m644 "$srcdir/grub.cfg" \
+		"$pkgdir/boot/grub/grub.cfg"
+}
+
+nonfree_firmware() {
+	pkgdesc="Touchscreen firmware"
+	depends="firmware-surftab-wintron7.0"
+	mkdir "$subpkgdir"
+}
+
+sha512sums="1dc0d206905aad9de0efc7284bdb8b27f739d0657d848a616c7df89a7bd982c579a492590e1413a88c772d81d5222847c683bbb8ecdcfb410e31bd9e568bc5fb  deviceinfo
+8b77755eb59c07f84cb00439f09e0f4bbc2fdf6da8e41160bb1967463c0e098d012a18465891a5d0fc64a37712ba3840a110aa7a371da90c23b4fcd7ac63c004  grub.cfg"

device/device-surftab-wintron7.0/deviceinfo

+# Reference: <https://postmarketos.org/deviceinfo>
+# Please use double quotes only. You can source this file in shell scripts.
+
+deviceinfo_format_version="0"
+deviceinfo_name="TrekStor SurfTab wintron 7.0"
+deviceinfo_manufacturer="TrekStor"
+deviceinfo_codename="surftab-wintron7.0"
+deviceinfo_date=""
+deviceinfo_dtb=""
+deviceinfo_modules_initfs="usbhid jbd2 sdhci sdhci-pci sdhci_acpi mmc_core mmc_block mbcache ext4 scsi_mod sd_mod sg 
+libata ahci libahci usb_storage xhci_hcd ehci_hcd uas xhci_pci fat vfat nls_cp437 nls_utf8"
+deviceinfo_arch="x86_64"
+
+# Device related
+deviceinfo_keyboard="false"
+deviceinfo_external_storage="true"
+deviceinfo_screen_width="1024"
+deviceinfo_screen_height="600"
+deviceinfo_dev_touchscreen="/dev/input/event3"
+deviceinfo_dev_touchscreen_calibration="4.7 0 0 0 6.5 0"
+deviceinfo_dev_keyboard=""
+
+# Bootloader related
+deviceinfo_flash_method="none"
+deviceinfo_boot_filesystem="fat16"

device/device-surftab-wintron7.0/grub.cfg

+timeout=4
+menuentry "postmarketOS" {
+	linux ($root)/vmlinuz-vanilla
+	initrd ($root)/initramfs-vanilla
+}

device/device-surftab-wintron7.0/grub_early.cfg

+search --no-floppy --set=root --label "pmOS_boot"
+set prefix=($root)/grub

firmware/firmware-surftab-wintron7.0/APKBUILD

+pkgname=firmware-surftab-wintron7.0
+pkgver=1
+pkgrel=1
+pkgdesc="Firmware for Trekstor Surftab Wintron 7.0"
+url="https://github.com/onitake/gsl-firmware"
+arch="x86_64"
+license="proprietary"
+depends=""
+source="https://github.com/onitake/gsl-firmware/raw/231bb49e312966df4b2eebc46815d7dde90c9b52/firmware/linux/silead/gsl1686-surftab-wintron70-st70416-6.fw"
+
+package() {
+	mkdir -p "$pkgdir/lib/firmware/silead"
+	install -Dm644 "$srcdir/gsl1686-surftab-wintron70-st70416-6.fw" \
+		"$pkgdir/lib/firmware/silead/mssl1680.fw"
+}
+
+sha512sums="30f4dca3bf01066fc4a1eff5a60453ca7147ea3838a6e070f25979f30b8d6d97d054f133e29a6efbb8a0fd4d17127e7191070c4df03f55a6bc90b953492be48a  gsl1686-surftab-wintron70-st70416-6.fw"