[Buildroot] fs/iso9660, grub2 : grub-eltorito.img not found during the generation of rootfs.iso9660

[arnaud.miche at orange.com]

Hi everybody,

I am trying Buildroot_2016.11.2 and I have an issue during the generation of an iso rootfs.

My target is an "x86-64-efi" system.

The error is the following one :
===================

>>>   Generating root filesystem image rootfs.iso9660
/usr/bin/install -D -m 0644 fs/iso9660/grub.cfg /home/arnaud/Developments/Projects/Linux_Firmware/Buildroot_2016.11.2/buildroot-2016.11.2/output/build/rootfs.iso9660.tmp/boot/grub/grub.cfg
/bin/sed -i -e "s%__KERNEL_PATH__%/boot/bzImage%" /home/arnaud/Developments/Projects/Linux_Firmware/Buildroot_2016.11.2/buildroot-2016.11.2/output/build/rootfs.iso9660.tmp/boot/grub/grub.cfg
/usr/bin/install -D -m 0644 /home/arnaud/Developments/Projects/Linux_Firmware/Buildroot_2016.11.2/buildroot-2016.11.2/output/images/grub-eltorito.img /home/arnaud/Developments/Projects/Linux_Firmware/Buildroot_2016.11.2/buildroot-2016.11.2/output/build/rootfs.iso9660.tmp/boot/grub/grub-eltorito.img
/usr/bin/install: impossible d'évaluer « /home/arnaud/Developments/Projects/Linux_Firmware/Buildroot_2016.11.2/buildroot-2016.11.2/output/images/grub-eltorito.img »: Aucun fichier ou dossier de ce type
fs/iso9660/iso9660.mk:160: recipe for target '/home/arnaud/Developments/Projects/Linux_Firmware/Buildroot_2016.11.2/buildroot-2016.11.2/output/images/rootfs.iso9660' failed
make: *** [/home/arnaud/Developments/Projects/Linux_Firmware/Buildroot_2016.11.2/buildroot-2016.11.2/output/images/rootfs.iso9660] Error 1

If I check the makefile for Grub2, I find that the grub-eltorito.img file is created for only i386_pc target. See boot/grub2.mk, lines 80 to 85.

ifeq ($(BR2_TARGET_GRUB2_I386_PC),y)
define GRUB2_IMAGE_INSTALL_ELTORITO
    cat $(HOST_DIR)/usr/lib/grub/$(GRUB2_TUPLE)/cdboot.img $(GRUB2_IMAGE) > \
        $(BINARIES_DIR)/grub-eltorito.img
endef
endif

But in iso9660.mk, the only condition for installing grub-eltorito.img is the use of rootfs_iso9660_grub2 as seen lines 56 to 64 :

else ifeq ($(BR2_TARGET_ROOTFS_ISO9660_GRUB2),y)
ROOTFS_ISO9660_DEPENDENCIES += grub2
ROOTFS_ISO9660_BOOTLOADER_CONFIG_PATH = \
    $(ROOTFS_ISO9660_TARGET_DIR)/boot/grub/grub.cfg
ROOTFS_ISO9660_BOOT_IMAGE = boot/grub/grub-eltorito.img
define ROOTFS_ISO9660_INSTALL_BOOTLOADER
    $(INSTALL) -D -m 0644 $(BINARIES_DIR)/grub-eltorito.img \
        $(ROOTFS_ISO9660_TARGET_DIR)/boot/grub/grub-eltorito.img
endef

Is it a bug ? Or I misunderstood anything ?

If it is a bug, I lack some informations for patching my own installation with a convenient manner :

Is grub-eltorito.img still relevant when using Grub2 ?
If yes, should grub-eltorito.img be just built with i386_pc ? Must I have to add x86_64_efi target ?

Thank you a lot for your responses.

Arnaud


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