179ae068eb
Add support to boot the Grub bootloader from an EFI BIOS in the ISO9660 image. For that we need to create EFI System Partition (ESP). The ESP is a vfat partition which contain the Grub2 binary at the /EFI/BOOT/ location. xorriso command will generate the iso image including the ESP. We notice Grub can not read and mount the ESP, therefore we place the Grub configuration file in the ISO9660 partition. A Grub2 builtin configuration need to be used to tell Grub2 to search automatically its configuration file in the ISO9660 partition. Use 'set root=(cd0)' in the configuration file passed to BR2_TARGET_GRUB2_BUILTIN_CONFIG_EFI. Signed-off-by: Kory Maincent <kory.maincent@bootlin.com> [yann.morin.1998@free.fr: fix timestamp fixup hook] Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
105 lines
3.5 KiB
Plaintext
105 lines
3.5 KiB
Plaintext
config BR2_TARGET_ROOTFS_ISO9660
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bool "iso image"
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depends on (BR2_i386 || BR2_x86_64)
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depends on BR2_LINUX_KERNEL
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depends on BR2_TARGET_GRUB2 || BR2_TARGET_SYSLINUX_ISOLINUX
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select BR2_LINUX_KERNEL_INSTALL_TARGET \
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if (!BR2_TARGET_ROOTFS_ISO9660_INITRD && !BR2_TARGET_ROOTFS_INITRAMFS)
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help
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Build a bootable ISO9660 image. By default, the root
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filesystem is directly packed as the ISO9660 filesystem,
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which means the root filesystem will be read-only. It
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requires ISO9660 filesystem support and CDROM support in the
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kernel.
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However, if BR2_TARGET_ROOTFS_INITRAMFS or
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BR2_TARGET_ROOTFS_ISO9660_INITRD have been enabled, the
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ISO9660 filesystem will only contain a kernel image and
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optionally an external initrd image. In this case, the
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filesystem being in RAM, it will be read/write. No ISO9660
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or CDROM support is needed in the kernel.
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if BR2_TARGET_ROOTFS_ISO9660
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choice
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prompt "Bootloader"
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config BR2_TARGET_ROOTFS_ISO9660_GRUB2
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bool "grub2"
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depends on BR2_TARGET_GRUB2
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help
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Use Grub 2 as the bootloader for the ISO9660 image. Make
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sure to enable the 'iso9660' module in
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BR2_TARGET_GRUB2_BUILTIN_MODULES_PC or
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BR2_TARGET_GRUB2_BUILTIN_MODULES_EFI. Use 'cd' as the boot
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partition in BR2_TARGET_GRUB2_BOOT_PARTITION= for GRUB on BIOS
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or 'set root=(cd0)' in the configuration file passed to
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BR2_TARGET_GRUB2_BUILTIN_CONFIG_EFI for GRUB on EFI.
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config BR2_TARGET_ROOTFS_ISO9660_ISOLINUX
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bool "isolinux"
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depends on BR2_TARGET_SYSLINUX_ISOLINUX
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endchoice
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choice
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prompt "Boot payload"
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config BR2_TARGET_ROOTFS_ISO9660_BIOS_BOOTLOADER
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bool "legacy bios"
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depends on BR2_TARGET_GRUB2_I386_PC || BR2_TARGET_ROOTFS_ISO9660_ISOLINUX
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config BR2_TARGET_ROOTFS_ISO9660_EFI_BOOTLOADER
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bool "UEFI"
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depends on BR2_TARGET_GRUB2_I386_EFI || BR2_TARGET_GRUB2_X86_64_EFI
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endchoice
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config BR2_TARGET_ROOTFS_ISO9660_BOOT_MENU
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string "Boot menu config file"
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default "fs/iso9660/grub.cfg" if BR2_TARGET_ROOTFS_ISO9660_GRUB2
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default "fs/iso9660/isolinux.cfg" if BR2_TARGET_ROOTFS_ISO9660_ISOLINUX
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help
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Use this option to provide a custom bootloader configuration
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file (grub.cfg for Grub 2, isolinux.cfg for isolinux).
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Note that the strings __KERNEL_PATH__ and __INITRD_PATH__
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will automatically be replaced by the path to the kernel and
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initrd images respectively.
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config BR2_TARGET_ROOTFS_ISO9660_INITRD
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bool "Use initrd"
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default y
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select BR2_TARGET_ROOTFS_CPIO
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help
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Enable this option to have the root filesystem bundled as an
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initrd/initramfs rather than directly as the ISO9660
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filesystem. With this option enabled, the ISO9660 will only
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contain a kernel image, an initrd image (unless an initramfs
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linked into the kernel is used) and the bootloader.
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config BR2_TARGET_ROOTFS_ISO9660_TRANSPARENT_COMPRESSION
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bool "transparent compression"
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depends on !BR2_TARGET_ROOTFS_ISO9660_INITRD
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depends on !BR2_TARGET_ROOTFS_INITRAMFS
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help
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Say 'y' to enable use of transparent (de)compression. Files
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are stored compressed and will be decompressed on-the-fly
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upon access at runtime.
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config BR2_TARGET_ROOTFS_ISO9660_HYBRID
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bool "Build hybrid image"
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depends on BR2_TARGET_ROOTFS_ISO9660_ISOLINUX
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help
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Enable this option to build an hybrid image, i.e an image
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which can either be booted from a CD-ROM or from a device
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which BIOS considers a hard disk or ZIP disk, e.g. a USB key
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or similar.
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endif
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comment "iso image needs a Linux kernel and either grub2 or isolinux to be built"
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depends on BR2_i386 || BR2_x86_64
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depends on !BR2_LINUX_KERNEL || \
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!(BR2_TARGET_GRUB2 || BR2_TARGET_SYSLINUX_ISOLINUX)
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