--- /dev/null
+config BR2_TARGET_GRUB2
+ bool "grub2"
+ depends on BR2_i386 || BR2_x86_64
+ help
+ GNU GRUB is a Multiboot boot loader. It was derived from
+ GRUB, the GRand Unified Bootloader, which was originally
+ designed and implemented by Erich Stefan Boleyn. GRUB 2 has
+ replaced what was formerly known as GRUB (i.e. version
+ 0.9x), which has, in turn, become GRUB Legacy.
+
+ Amongst others, GRUB2 offers EFI support, which GRUB Legacy
+ doesn't provide.
+
+ Notes on using Grub2 for BIOS-based platforms
+ =============================================
+
+ 1. Create a disk image
+ dd if=/dev/zero of=disk.img bs=1M count=32
+ 2. Partition it (either legacy or GPT style partitions work)
+ cfdisk disk.img
+ - Create one partition, type Linux, for the root
+ filesystem. The only constraint is to make sure there
+ is enough free space *before* the first partition to
+ store Grub2. Leaving 1 MB of free space is safe.
+ 3. Setup loop device and loop partitions
+ sudo losetup -f disk.img
+ sudo partx -a disk.img
+ 4. Prepare the root partition
+ sudo mkfs.ext3 -L root /dev/loop0p1
+ sudo mount /dev/loop0p1 /mnt
+ sudo tar -C /mnt -xf output/images/rootfs.tar
+ sudo umount /mnt
+ 5. Install Grub2
+ ./output/host/usr/sbin/grub-bios-setup \
+ -b ./output/host/usr/lib/grub/i386-pc/boot.img \
+ -c ./output/images/grub.img -d . /dev/loop0
+ 6. Your disk.img is ready!
+
+ To test your BIOS image in Qemu:
+
+ qemu-system-{i386,x86-64} -hda disk.img
+
+ Notes on using Grub2 for EFI-based platforms
+ ============================================
+
+ 1. Create a disk image
+ dd if=/dev/zero of=disk.img bs=1M count=32
+ 2. Partition it with GPT partitions
+ cgdisk disk.img
+ - Create a first partition, type EF00, for the
+ bootloader and kernel image
+ - Create a second partition, type 8300, for the root
+ filesystem.
+ 3. Setup loop device and loop partitions
+ sudo losetup -f disk.img
+ sudo partx -a /dev/loop0
+ 4. Prepare the boot partition
+ sudo mkfs.vfat -n boot /dev/loop0p1
+ sudo mount /dev/loop0p1 /mnt
+ sudo cp -a output/images/efi-part/* /mnt/
+ sudo cp output/images/bzImage /mnt/
+ sudo umount /mnt
+ 5. Prepare the root partition
+ sudo mkfs.ext3 -L root /dev/loop0p2
+ sudo mount /dev/loop0p2 /mnt
+ sudo tar -C /mnt -xf output/images/rootfs.tar
+ sudo umount /mnt
+ 6 Cleanup loop device
+ sudo partx -d /dev/loop0
+ sudo losetup -d /dev/loop0
+ 7. Your disk.img is ready!
+
+ To test your EFI image in Qemu:
+
+ 1. Download the EFI BIOS for Qemu
+ Version IA32 or X64 depending on the chosen Grub2
+ platform (i386-efi vs. x86-64-efi)
+ http://sourceforge.net/projects/edk2/files/OVMF/
+ 2. Extract, and rename OVMF.fd to bios.bin and
+ CirrusLogic5446.rom to vgabios-cirrus.bin.
+ 3. qemu-system-{i386,x86-64} -L ovmf-dir/ -hda disk.img
+ 4. Make sure to pass pci=nocrs to the kernel command line,
+ to workaround a bug in the EFI BIOS regarding the
+ EFI framebuffer.
+
+ http://www.gnu.org/software/grub/
+
+if BR2_TARGET_GRUB2
+
+choice
+ prompt "Platform"
+
+config BR2_TARGET_GRUB2_I386_PC
+ bool "i386-pc"
+ help
+ Select this option if the platform you're targetting is a
+ x86 or x86-64 legacy BIOS based platform.
+
+config BR2_TARGET_GRUB2_I386_EFI
+ bool "i386-efi"
+ help
+ Select this option if the platform you're targetting has a
+ 32 bits EFI BIOS. Note that some x86-64 platforms use a 32
+ bits EFI BIOS, and this option should be used in this case.
+
+config BR2_TARGET_GRUB2_X86_64_EFI
+ bool "x86-64-efi"
+ help
+ Select this option if the platform you're targetting has a
+ 64 bits EFI BIOS.
+
+endchoice
+
+config BR2_TARGET_GRUB2_BUILTIN_MODULES
+ string "builtin modules"
+ default "boot linux ext2 fat part_msdos part_gpt normal biosdisk" if BR2_TARGET_GRUB2_I386_PC
+ default "boot linux ext2 fat part_msdos part_gpt normal efi_gop" \
+ if BR2_TARGET_GRUB2_I386_EFI || BR2_TARGET_GRUB2_X86_64_EFI
+
+endif # BR2_TARGET_GRUB2
--- /dev/null
+################################################################################
+#
+# grub2
+#
+################################################################################
+
+GRUB2_VERSION = 2.00
+GRUB2_SITE = $(BR2_GNU_MIRROR)/grub/
+GRUB2_SOURCE = grub-$(GRUB2_VERSION).tar.xz
+GRUB2_LICENSE = GPLv3+
+GRUB2_LICENSE_FILES = COPYING
+GRUB2_DEPENDENCIES = host-bison host-flex
+
+ifeq ($(BR2_TARGET_GRUB2_I386_PC),y)
+GRUB2_IMAGE = $(BINARIES_DIR)/grub.img
+GRUB2_CFG = $(TARGET_DIR)/boot/grub/grub.cfg
+GRUB2_TUPLE = i386-pc
+GRUB2_TARGET = i386
+GRUB2_PLATFORM = pc
+else ifeq ($(BR2_TARGET_GRUB2_I386_EFI),y)
+GRUB2_IMAGE = $(BINARIES_DIR)/efi-part/EFI/BOOT/bootia32.efi
+GRUB2_CFG = $(BINARIES_DIR)/efi-part/EFI/BOOT/grub.cfg
+GRUB2_PREFIX = /EFI/BOOT
+GRUB2_TUPLE = i386-efi
+GRUB2_TARGET = i386
+GRUB2_PLATFORM = efi
+else ifeq ($(BR2_TARGET_GRUB2_X86_64_EFI),y)
+GRUB2_IMAGE = $(BINARIES_DIR)/efi-part/EFI/BOOT/bootx64.efi
+GRUB2_CFG = $(BINARIES_DIR)/efi-part/EFI/BOOT/grub.cfg
+GRUB2_PREFIX = /EFI/BOOT
+GRUB2_TUPLE = x86_64-efi
+GRUB2_TARGET = x86_64
+GRUB2_PLATFORM = efi
+endif
+
+GRUB2_BUILTIN_MODULES = $(call qstrip,$(BR2_TARGET_GRUB2_BUILTIN_MODULES))
+
+# Grub2 is kind of special: it considers CC, LD and so on to be the
+# tools to build the native tools (i.e to be executed on the build
+# machine), and uses TARGET_CC, TARGET_CFLAGS, TARGET_CPPFLAGS to
+# build the bootloader itself.
+
+GRUB2_CONF_ENV = \
+ $(HOST_CONFIGURE_OPTS) \
+ CPP="$(HOSTCC) -E" \
+ TARGET_CC="$(TARGET_CC)" \
+ TARGET_CFLAGS="$(TARGET_CFLAGS)" \
+ TARGET_CPPFLAGS="$(TARGET_CPPFLAGS)"
+
+GRUB2_CONF_OPT = \
+ --target=$(GRUB2_TARGET) \
+ --with-platform=$(GRUB2_PLATFORM) \
+ --disable-grub-mkfont \
+ --enable-efiemu=no \
+ --enable-liblzma=no \
+ --enable-device-mapper=no \
+ --enable-libzfs=no \
+ --disable-werror
+
+# We don't want all the native tools and Grub2 modules to be installed
+# in the target. So we in fact install everything into the host
+# directory, and the image generation process (below) will use the
+# grub-mkimage tool and Grub2 modules from the host directory.
+
+GRUB2_INSTALL_TARGET_OPT = DESTDIR=$(HOST_DIR) install
+
+define GRUB2_IMAGE_INSTALLATION
+ mkdir -p $(dir $(GRUB2_IMAGE))
+ $(HOST_DIR)/usr/bin/grub-mkimage \
+ -d $(HOST_DIR)/usr/lib/grub/$(GRUB2_TUPLE) \
+ -O $(GRUB2_TUPLE) \
+ -o $(GRUB2_IMAGE) \
+ $(if $(GRUB2_PREFIX),-p $(GRUB2_PREFIX)) \
+ $(GRUB2_BUILTIN_MODULES)
+ mkdir -p $(dir $(GRUB2_CFG))
+ $(INSTALL) -D -m 0644 boot/grub2/grub.cfg $(GRUB2_CFG)
+endef
+GRUB2_POST_INSTALL_TARGET_HOOKS += GRUB2_IMAGE_INSTALLATION
+
+ifeq ($(GRUB2_PLATFORM),efi)
+define GRUB2_EFI_STARTUP_NSH
+ echo $(notdir $(GRUB2_IMAGE)) > \
+ $(BINARIES_DIR)/efi-part/startup.nsh
+endef
+GRUB2_POST_INSTALL_TARGET_HOOKS += GRUB2_EFI_STARTUP_NSH
+endif
+
+$(eval $(autotools-package))
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