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 Adrian
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9927855e53 |
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# 3-in-1 Hybrid Boot Disk (BIOS/UEFI)
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This guide shows how to prepare a disk on Ubuntu
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to be bootable from BIOS, 32-bit and 64-bit UEFI
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with Secure Boot enabled.
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The intention is to create a bootable USB stick
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that can be used to boot a rescue system.
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All commands should be executed as root.
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For more technical information, see the [notes section](#notes) at the end.
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Grub will be used as the bootloader.
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Install the following packages:
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apt install grub-efi-amd64-bin grub-efi-ia32-bin grub-pc-bin
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apt install grub-efi-amd64-signed # grub-efi-ia32-signed not available on Ubuntu
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## Partitioning
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* The GUIDs are fixed for easier setup with Windows
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* The last partition is optional: it can be used to make changes of Ubuntu persistent
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* Set the `dev` variable accordingly
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<!-- -->
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dev=/path/to/dev
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sgdisk --disk-guid=4b534944-4949-4949-b741-44495858580a $dev
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sgdisk --new=1:1M:+1M --typecode=1:ef02 --partition-guid=1:42555247-4949-4949-b741-44495858580a $dev
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sgdisk --new=2:2M:+14M --typecode=2:ef00 --partition-guid=2:49494645-4949-4949-b741-44495858580a $dev
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sgdisk --new=3:16M:+496M --typecode=3:2700 --partition-guid=3:524e4957-4945-4949-b741-44495858580a $dev
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sgdisk --new=4:512M:+2048M --typecode=4:8300 --partition-guid=4:4e554255-5554-4949-b741-44495858580a $dev
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sgdisk --new=5:2560M:4G --typecode=5:8300 --partition-guid=5:50534143-5245-4949-b741-44495858580a $dev
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## Format
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* Run `partprobe` before working with the disk references below
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* The labels are set for easier configuration of GRUB
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* The first partition is not formatted as it will be used by GRUB to store its executable code
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<!-- -->
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mkdosfs -F 16 -n hybrid-boot /dev/disk/by-partuuid/49494645-4949-4949-b741-44495858580a
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mkntfs -Q -L hybrid-winre /dev/disk/by-partuuid/524e4957-4945-4949-b741-44495858580a
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mkfs.ext4 -L hybrid-ubuntu /dev/disk/by-partuuid/4e554255-5554-4949-b741-44495858580a
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mkfs.ext4 -L casper-rw /dev/disk/by-partuuid/50534143-5245-4949-b741-44495858580a
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## Install GRUB
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* Set the `mnt` variable accordingly
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<!-- -->
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mnt=/path/to/mount
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mount /dev/disk/by-partuuid/4e554255-5554-4949-b741-44495858580a $mnt
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mkdir -p $mnt/boot/efi
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mount /dev/disk/by-partuuid/49494645-4949-4949-b741-44495858580a $mnt/boot/efi
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grub-install --root=$mnt --removable --no-nvram --uefi-secure-boot --target=x86_64-efi $dev
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grub-install --root=$mnt --removable --no-nvram --uefi-secure-boot --target=i386-efi $dev
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grub-install --root=$mnt --modules='ext2 part_gpt' --target=i386-pc $dev
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Place the following configuration snippets in `$mnt/boot/grub/grub.cfg`.
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### Ubuntu
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menuentry 'Ubuntu' {
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search --set --label hybrid-ubuntu
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linux /casper/vmlinuz boot=casper ignore_uuid persistent
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initrd /casper/initrd
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}
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The `persistent` parameter is only useful, if the persistence partition was created.
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### Windows
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menuentry 'Windows (UEFI)' {
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search --set --label hybrid-boot
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chainloader /EFI/Microsoft/Boot/bootmgfw.efi
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}
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menuentry 'Windows (BIOS)' {
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search --set --label hybrid-winre
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ntldr /Boot/bootmgr
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}
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## Copy OS Files
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### Ubuntu
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* Set the `cdrom` variable accordingly
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cdrom=/path/to/ubuntu-iso
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cp -r $cdrom/casper $cdrom/preseed $mnt
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### Windows
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* Set the `cdrom` and `winre` variables accordingly
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<!-- -->
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cdrom=/path/to/windows-iso
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winre=/path/to/winre-mnt
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mount /dev/disk/by-partuuid/524e4957-4945-4949-b741-44495858580a $winre
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wim=$cdrom/sources/install.wim
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dir=$winre/Recovery
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mkdir $dir
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7z e -o$dir $wim 1/Windows/System32/Recovery/Winre.wim
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7z e -o$dir $wim 1/Windows/System32/boot.sdi
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dir=$winre/Boot
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mkdir $dir
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7z e -o$dir $wim 1/Windows/Boot/PCAT/bootmgr
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dir=$mnt/boot/efi/EFI/Microsoft/Boot
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mkdir -p $dir
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7z e -o$dir $wim 1/Windows/Boot/EFI/bootmgfw.efi
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#### BCD
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Copy [winre-uefi.bcd](winre-uefi.bcd) and [winre-bios.bcd](winre-bios.bcd):
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cp winre-uefi.bcd $mnt/boot/efi/EFI/Microsoft/Boot/BCD
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cp winre-bios.bcd $winre/Boot/BCD
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## Windows Hybrid Boot
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Windows can not be booted from BIOS and UEFI with the same configuration.
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The above procedure enables Windows to boot using UEFI.
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### Boot in BIOS
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Windows needs an MBR to boot from BIOS:
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sgdisk --hybrid=3 $dev
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printf DISK | dd bs=1 seek=440 conv=notrunc of=$dev
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If you try to boot without the above configuration,
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the following message appears in the blink of an eye:
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ata1 master: Unknown device
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### Boot in UEFI
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Remove the hybrid MBR:
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echo start=1,type=ee | sfdisk -Y dos $dev
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Do *not* use `sgdisk` because it wipes the MBR boot code of GRUB.
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If you try to boot without the above configuration,
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the following message appears:
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BlInitializeLibrary failed 0xc00000bb
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## Notes
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### Windows Bootloaders
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The Windows bootloader is configured using a file called `BCD` (Boot Configuration Data).
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The file is a binary Windows Registry file and references IDs from the partition table.
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This can make Windows boot problems cumbersome to fix.
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The above BCD files are usable if the disks were created using the described IDs.
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They were created in a VM using BCDEdit:
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[create-winre-uefi.bat](create-winre-uefi.bat) and
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[create-winre-bios.bat](create-winre-bios.bat).
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The UEFI bootloader `bootmgfw.efi` uses the disk and partition GUIDs from the GPT.
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The BIOS bootloader `bootmgr` uses the disk signature and partition start offsets in the MBR.
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To change GUIDs in a BCD, partitions with the same GUIDs can be recreated in a VM
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and BCDEdit can be used to recreate a BCD: [create-minimal.bat](create-minimal.bat).
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Alternatively `hivexsh` can be used to change the GUIDs in an existing BCD.
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### Casper Persistence
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The casper manual mentions the use of a file,
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but this only works on FAT, see
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[find_cow_device in casper-helpers](https://git.launchpad.net/ubuntu/+source/casper/tree/scripts/casper-helpers).
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@echo off
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bcdedit /createstore minimal.bcd
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bcdedit /store minimal.bcd /create {bootmgr}
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bcdedit /store minimal.bcd /create {2f4e4957-0d58-11e9-8000-080027414449} /application osloader /d "Windows 10"
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bcdedit /store minimal.bcd /set {bootmgr} default {2f4e4957-0d58-11e9-8000-080027414449}
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bcdedit /store minimal.bcd /set {bootmgr} displayorder {default}
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bcdedit /store minimal.bcd /set {default} device partition=C:
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bcdedit /store minimal.bcd /set {default} osdevice partition=C:
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bcdedit /store minimal.bcd /set {default} path \Windows\System32\winload.efi
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bcdedit /store minimal.bcd /set {default} systemroot \Windows
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@echo off
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bcdedit /createstore winre-bios.bcd
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bcdedit /store winre-bios.bcd /create {bootmgr}
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bcdedit /store winre-bios.bcd /create {2e455257-0d58-11e9-8000-080027414449} /application osloader /d "Windows Recovery Environment"
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bcdedit /store winre-bios.bcd /create {2e564544-0d58-11e9-8000-080027414449} /device
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bcdedit /store winre-bios.bcd /set {bootmgr} default {2e455257-0d58-11e9-8000-080027414449}
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bcdedit /store winre-bios.bcd /set {bootmgr} displayorder {default}
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bcdedit /store winre-bios.bcd /set {default} device ramdisk=[C:]\Recovery\Winre.wim,{2e564544-0d58-11e9-8000-080027414449}
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bcdedit /store winre-bios.bcd /set {default} osdevice ramdisk=[C:]\Recovery\Winre.wim,{2e564544-0d58-11e9-8000-080027414449}
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bcdedit /store winre-bios.bcd /set {default} path \Windows\System32\winload.exe
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bcdedit /store winre-bios.bcd /set {default} systemroot \Windows
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bcdedit /store winre-bios.bcd /set {default} winpe yes
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bcdedit /store winre-bios.bcd /set {2e564544-0d58-11e9-8000-080027414449} ramdisksdidevice partition=C:
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bcdedit /store winre-bios.bcd /set {2e564544-0d58-11e9-8000-080027414449} ramdisksdipath \Recovery\boot.sdi
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@echo off
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bcdedit /createstore winre-uefi.bcd
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bcdedit /store winre-uefi.bcd /create {bootmgr}
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bcdedit /store winre-uefi.bcd /create {2f455257-0d58-11e9-8000-080027414449} /application osloader /d "Windows Recovery Environment"
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bcdedit /store winre-uefi.bcd /create {2f564544-0d58-11e9-8000-080027414449} /device
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bcdedit /store winre-uefi.bcd /set {bootmgr} default {2f455257-0d58-11e9-8000-080027414449}
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bcdedit /store winre-uefi.bcd /set {bootmgr} displayorder {default}
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bcdedit /store winre-uefi.bcd /set {default} device ramdisk=[C:]\Recovery\Winre.wim,{2f564544-0d58-11e9-8000-080027414449}
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bcdedit /store winre-uefi.bcd /set {default} osdevice ramdisk=[C:]\Recovery\Winre.wim,{2f564544-0d58-11e9-8000-080027414449}
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bcdedit /store winre-uefi.bcd /set {default} path \Windows\System32\winload.efi
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bcdedit /store winre-uefi.bcd /set {default} systemroot \Windows
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bcdedit /store winre-uefi.bcd /set {default} winpe yes
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bcdedit /store winre-uefi.bcd /set {2f564544-0d58-11e9-8000-080027414449} ramdisksdidevice partition=C:
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bcdedit /store winre-uefi.bcd /set {2f564544-0d58-11e9-8000-080027414449} ramdisksdipath \Recovery\boot.sdi
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Binary file not shown.
Binary file not shown.
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@ -1,136 +0,0 @@
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# Introduction
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This guide describes how to create a bootable medium
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for the following purpose:
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* Boot in BIOS (Legacy/CSM) mode
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* Boot in UEFI mode using Secure Boot
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* Start Ubuntu or a Windows 7, 8, or 10 installation
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Set the following variables accordingly:
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FULLDEV=/dev/sdb
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DEV=${FULLDEV}1
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MNT=/mnt
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# Preparation
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## Partition An Empty Medium
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parted "$FULLDEV"
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mklabel msdos
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mkpart pri fat32 1MiB -1s
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set 1 boot on
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quit
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mkdosfs -F 32 -R 8 "$DEV"
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## Create Directory Structure
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See below for the config files `syslinux.cfg` and `grub.cfg`
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mount -o shortname=winnt "$DEV" "$MNT"
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mkdir -p "$MNT"/boot/syslinux
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mkdir -p "$MNT"/boot/grub
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mkdir -p "$MNT"/efi/boot
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cp syslinux.cfg "$MNT"/boot/syslinux
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cp grub.cfg "$MNT"/boot/grub
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# BIOS
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syslinux -i -d boot/syslinux "$DEV"
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cd /usr/lib/syslinux
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for f in libutil libcom32 menu chain; do cp modules/bios/$f.c32 "$MNT"/boot/syslinux; done
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sh -c "cat mbr/mbr.bin > $FULLDEV"
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Note: If a `Boot error` gets reported, try this:
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* Try a 3.xx version
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* `mkdiskimage -4 $FULLDEV 0 64 32`
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# UEFI
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grub-install --target=x86_64-efi --uefi-secure-boot \
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--efi-directory="$MNT" --boot-directory="$MNT"/boot \
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--bootloader-id=boot --no-nvram "$DEV"
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cp /usr/lib/shim/shim.efi.signed "$MNT"/efi/boot/bootx64.efi
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Note: Due to [a bug](https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1450783),
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the config file needs to be in efi/ubuntu:
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mkdir -p "$MNT"/efi/ubuntu
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cp -a "$MNT"/efi/boot/grub.cfg "$MNT"/efi/ubuntu
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# Copy OS files
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## Ubuntu
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Execute the following commands in the directory of the mounted ISO:
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rsync -Pa casper preseed "$MNT"/
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## Windows
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Execute the following commands in the directory of the mounted ISO:
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rsync -Pa sources boot efi "$MNT"/
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rm "$MNT"/sources/ei.cfg # To enable Edition selection
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cp bootmgr "$MNT"/boot
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7z e -o"$MNT"/efi/microsoft/boot sources/boot.wim 1/Windows/Boot/EFI/bootmgfw.efi
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When copying Windows 8, the default bootloader gets replaced. Install Shim again:
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cp /usr/lib/shim/shim.efi.signed "$MNT"/efi/boot/bootx64.efi
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# Config Files
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## syslinux.cfg
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default menu.c32
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prompt 0
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menu title Select Operating System
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label ubuntu
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menu default
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menu label Start Ubuntu
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kernel /casper/vmlinuz.efi
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append initrd=/casper/initrd.lz file=/cdrom/preseed/ubuntu.seed boot=casper ignore_uuid maybe-ubiquity quiet splash --
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label win7x64
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menu label Install Windows
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com32 chain.c32
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append fs ntldr=/boot/bootmgr
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# grub.cfg
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insmod efi_gop
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insmod efi_uga
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insmod font
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menuentry "Start Ubuntu" {
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set gfxmode=auto
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set gfxpayload=keep
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linux /casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper ignore_uuid maybe-ubiquity quiet splash --
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initrd /casper/initrd.lz
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}
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menuentry "Install Windows" {
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insmod part_gpt
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insmod chain
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set root='(hd0,1)'
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chainloader /efi/microsoft/boot/bootmgfw.efi
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}
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menuentry "UEFI Setup" {
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fwsetup
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}
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# Recommended Disk Partitioning for Multiboot Systems
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parted /dev/sda
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mklabel gpt
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mkpart Boot fat32 1MiB 257MiB
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mkpart SysUbuntu ext4 257MiB 12GiB
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mkpart SysWin ntfs 12GiB 52GiB
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mkpart Data ext4 52GiB -1s
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set 1 esp on
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||||
Loading…
Reference in New Issue