grub2: enable EFI for armvirt

This adds a separate package for EFI on Arm SystemReady
compatible machines. 32-bit Arm UEFI is supported as well.

It is very similar to x86-64 EFI setup, without the
need for BIOS backward compatibility and slightly
different default modules.

Signed-off-by: Mathew McBride <matt@traverse.com.au>

config/Config-images.in

@@ -204,11 +204,12 @@ menu "Target Images"
 
 	config GRUB_EFI_IMAGES
 		bool "Build GRUB EFI images (Linux x86 or x86_64 host only)"
-		depends on TARGET_x86
+		depends on TARGET_x86 || TARGET_armvirt
 		depends on TARGET_ROOTFS_EXT4FS || TARGET_ROOTFS_JFFS2 || TARGET_ROOTFS_SQUASHFS
-		select PACKAGE_grub2
+		select PACKAGE_grub2 if TARGET_x86
-		select PACKAGE_grub2-efi
+		select PACKAGE_grub2-efi if TARGET_x86
-		select PACKAGE_grub2-bios-setup
+		select PACKAGE_grub2-bios-setup if TARGET_x86
+		select PACKAGE_grub2-efi-arm if TARGET_armvirt
 		select PACKAGE_kmod-fs-vfat
 		default y
 

package/boot/grub2/Makefile

@@ -33,14 +33,15 @@ include $(INCLUDE_DIR)/package.mk
 define Package/grub2/Default
   CATEGORY:=Boot Loaders
   SECTION:=boot
-  TITLE:=GRand Unified Bootloader ($(1))
+  TITLE:=GRand Unified Bootloader ($(2))
   URL:=http://www.gnu.org/software/grub/
-  DEPENDS:=@TARGET_x86
+  DEPENDS:=@TARGET_$(1)
-  VARIANT:=$(1)
+  VARIANT:=$(2)
 endef
 
-Package/grub2=$(call Package/grub2/Default,pc)
+Package/grub2=$(call Package/grub2/Default,x86,pc)
-Package/grub2-efi=$(call Package/grub2/Default,efi)
+Package/grub2-efi=$(call Package/grub2/Default,x86,efi)
+Package/grub2-efi-arm=$(call Package/grub2/Default,armvirt,efi)
 
 define Package/grub2-editenv
   CATEGORY:=Utilities
@@ -107,6 +108,10 @@ ifneq ($(BUILD_VARIANT),none)
   MAKE_PATH := grub-core
 endif
 
+ifeq ($(CONFIG_arm),y)
+  TARGET_CFLAGS := $(filter-out -mfloat-abi=hard,$(TARGET_CFLAGS))
+endif
+
 define Host/Configure
 	$(SED) 's,(RANLIB),(TARGET_RANLIB),' $(HOST_BUILD_DIR)/grub-core/Makefile.in
 	$(Host/Configure/Default)
@@ -162,9 +167,31 @@ define Package/grub2-efi/install
 		-O $(CONFIG_ARCH)-efi \
 		-c ./files/grub-early.cfg \
 		-o $(STAGING_DIR_IMAGE)/grub2/iso-boot$(if $(CONFIG_x86_64),x64,ia32).efi \
-		at_keyboard boot chain configfile fat iso9660 linux ls part_msdos part_gpt reboot serial test efi_gop efi_uga
+		boot chain configfile fat iso9660 linux ls part_msdos part_gpt reboot serial test efi_gop efi_uga
 endef
 
+define Package/grub2-efi-arm/install
+	$(INSTALL_DIR) $(STAGING_DIR_IMAGE)/grub2
+	cp ./files/grub-early-gpt.cfg $(PKG_BUILD_DIR)/grub-early.cfg
+	$(STAGING_DIR_HOST)/bin/grub-mkimage \
+		-d $(PKG_BUILD_DIR)/grub-core \
+		-p /boot/grub \
+		-O arm$(if $(CONFIG_aarch64),64,)-efi \
+		-c $(PKG_BUILD_DIR)/grub-early.cfg \
+		-o $(STAGING_DIR_IMAGE)/grub2/boot$(if $(CONFIG_aarch64),aa64,arm).efi \
+		boot chain configfile fat linux ls part_gpt part_msdos reboot search \
+		search_fs_uuid search_label serial efi_gop lsefi minicmd ext2
+	$(STAGING_DIR_HOST)/bin/grub-mkimage \
+		-d $(PKG_BUILD_DIR)/grub-core \
+		-p /boot/grub \
+		-O arm$(if $(CONFIG_aarch64),64,)-efi \
+		-c ./files/grub-early.cfg \
+		-o $(STAGING_DIR_IMAGE)/grub2/iso-bootaa$(if $(CONFIG_aarch64),aa64,arm).efi \
+		boot chain configfile fat iso9660 linux ls lsefi minicmd part_msdos part_gpt \
+		reboot serial test efi_gop
+endef
+
+
 define Package/grub2-editenv/install
 	$(INSTALL_DIR) $(1)/usr/sbin
 	$(INSTALL_BIN) $(PKG_BUILD_DIR)/grub-editenv $(1)/usr/sbin/
@@ -178,5 +205,6 @@ endef
 $(eval $(call HostBuild))
 $(eval $(call BuildPackage,grub2))
 $(eval $(call BuildPackage,grub2-efi))
+$(eval $(call BuildPackage,grub2-efi-arm))
 $(eval $(call BuildPackage,grub2-editenv))
 $(eval $(call BuildPackage,grub2-bios-setup))

package/boot/grub2/files/grub-early-gpt.cfg

@@ -0,0 +1,2 @@
+search --set=root --label kernel
+configfile ($root)/efi/openwrt/grub.cfg