tablet-x64uefi: use grub instead of gummiboot (MR 2195)

Gummiboot was dropped from Alpine. Switch to grub, which is what we use
for tablet-x86uefi too.

In contrary to tablet-x86uefi, run the grub-mkimage command directly
inside the device package:
* This avoids creating another confusing grub-x86 like package (looks
  like the x86 version of alpine's grub package, as it's the case with
  grub-efi-x86, but actually it is just the result of grub-mkimage).
* In contrary to grub-efi-x86, the resulting efi file is not shared
  across several devices.
* It's consistent with uboot mkimage commands, which we also run in
  device packages.

Related: 398b7aef0b

device/testing/device-tablet-x64uefi/APKBUILD

@@ -1,38 +1,63 @@
 # Reference: <https://postmarketos.org/devicepkg>
 pkgname=device-tablet-x64uefi
 pkgdesc="Various tablets with atom CPU"
-pkgver=0.1
-pkgrel=10
+pkgver=0.2
+pkgrel=0
 url="https://postmarketos.org"
 license="MIT"
 arch="x86_64"
-options="!check !archcheck"
-depends="postmarketos-base linux-lts mesa-dri-swrast gummiboot"
-makedepends="devicepkg-dev gummiboot"
+# pmb:strict: avoid grub-related install error during build with pmbootstrap
+options="!check !archcheck pmb:strict"
+depends="postmarketos-base linux-lts mesa-dri-swrast"
+makedepends="devicepkg-dev grub grub-efi"
 source="
 	deviceinfo
-	loader.conf
-	postmarketos.conf
+	grub.cfg
+	grub_early.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
 
-	mkdir -p "$pkgdir"/boot/EFI/Boot
-	mkdir -p "$pkgdir"/boot/loader/entries
-
-	install -D -m644 "$srcdir"/loader.conf \
-		"$pkgdir"/boot/loader/loader.conf
-	install -D -m644 "$srcdir"/postmarketos.conf \
-		"$pkgdir"/boot/loader/entries/postmarketos.conf
-	install -D -m644 /usr/lib/gummiboot/gummibootx64.efi \
+	install -Dm644 "$srcdir"/grub.cfg \
+		"$pkgdir"/boot/grub/grub.cfg
+	install -Dm644 "$srcdir"/bootx64.efi \
 		"$pkgdir"/boot/EFI/Boot/bootx64.efi
 }
 
-sha512sums="49bde5bcf1120a3a93131eb5285c0a4589260d53902ca76ce7205878e187d7c26c4b275c7f2b6f09f11e019042601e6d3cefd938392f0a4386f839923ed37356  deviceinfo
-838a0a66d5513fb8f6d1a8d20743f25f24298e35a942b2a71e7f0b4aaaf35bd22a3ec245e993f1551fe60ce6e2eac7df1a4631d3e02ebc593965ce284002cffc  loader.conf
-8bf7002ca3ea51e018731e17154cfd1c9a8517a344c881d35e25979fb2ddbca7d48147c1d8f8cc407a65a8c8082dd9667eb6d0e1ddef060ff884b178be7af1e0  postmarketos.conf"
+sha512sums="
+49bde5bcf1120a3a93131eb5285c0a4589260d53902ca76ce7205878e187d7c26c4b275c7f2b6f09f11e019042601e6d3cefd938392f0a4386f839923ed37356  deviceinfo
+f98771a0e34326557626522ed3a4cbdb7e30b4dd4d288f4a391c4c68055bd5eab39a6bea9f72f63d6b76933ac11689ce1da2c96a83e1048e4b00e5003e1c25aa  grub.cfg
+0f9357d4eea089628fbceb1e3e96d21a3f4329aeb6743158a6f877f967ef274506404eba949d5f01b7e1adea149f9a3aef992a5e8cd4181f93ab00909b1c5ecd  grub_early.cfg
+"

device/testing/device-tablet-x64uefi/grub.cfg

@@ -0,0 +1,6 @@
+timeout=0
+
+menuentry "postmarketOS" {
+	linux ($root)/vmlinuz-lts console=tty0 PMOS_NO_OUTPUT_REDIRECT
+	initrd ($root)/initramfs-lts
+}

device/testing/device-tablet-x64uefi/grub_early.cfg

@@ -0,0 +1,2 @@
+search --no-floppy --set=root --label "pmOS_boot"
+set prefix=($root)/grub

device/testing/device-tablet-x64uefi/loader.conf

@@ -1,2 +0,0 @@
-default postmarketos
-timeout 4

device/testing/device-tablet-x64uefi/postmarketos.conf

@@ -1,4 +0,0 @@
-title postmarketOS
-linux vmlinuz-lts
-initrd initramfs-lts
-options console=tty0 PMOS_NO_OUTPUT_REDIRECT