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--- computing:bootloaders [2022/12/09 11:20] – oscar
+++ computing:bootloaders [Unknown date] (current) – removed - external edit (Unknown date) 127.0.0.1
@@ Line 1: / Line 1: @@
-====== Dual Window Grub Bootloader ======
-If Windows update overwrites the Grub bootloader. Simple way to restore is to copy the debian bootloader (grubx64.efi) over the windows bootloader. We do the following steps:
-  - Save the bootloader installed by Windows:  //copy E:\EFI\Microsoft\Boot\bootmgfw.efi E:\EFI\Microsoft\Boot\bootmgfw.efi.original//
-  - Copy the debian grub bootloader over the bootloader installed by Microsoft (bootmgfw.efi). //copy E:\EFI\debian\grubx64.efi E:\EFI\Microsoft\Boot\bootmgfw.efi//
-  - Add an entry in Grub boot menu to start the orginal windows loader.
-==== Correct within Windows ====
-Open CMD prompt as "Administrator" and mount the EFT partition as E: drive with:
-<code>
-mountvol E: /S
-E:\EFI>dir
- Volume in drive E has no label.
- Volume Serial Number is 502B-5BC6
- Directory of E:\EFI
--12-2016  20:05    <DIR>          .
--12-2016  20:05    <DIR>          ..
--12-2016  20:05    <DIR>          Microsoft
--02-2021  19:01    <DIR>          Boot
--11-2021  20:18    <DIR>          HP
--02-2021  08:35    <DIR>          debian
-File(s)              0 bytes
-Dir(s)     160.800.768 bytes free
-</code>
-copy the debian grub bootloader over the bootloader installed by Microsoft (bootmgfw.efi).
-<code>
-copy E:\EFI\debian\grubx64.efi E:\EFI\Microsoft\Boot\bootmgfw.efi
-</code>
-===== Add Windows enty in grub =====
-Add the following lines to: **/etc/grub.d/40_custom**
-<code>
-menuentry 'WIN 10 (on /dev/sda1)' --class windows --class os $menuentry_id_option 'Win10-efi-502B-5BC6' {
-        insmod part_gpt
-        insmod fat
-        set root='hd0,gpt1'
-        if [ x$feature_platform_search_hint = xy ]; then
-          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  502B-5BC6
-        else
-          search --no-floppy --fs-uuid --set=root 502B-5BC6
-        fi
-        chainloader /EFI/Microsoft/Boot/bootmgfw.efi.original.20221209
-}
-</code>
-===== BCDedit =====
-<code>
-C:\WINDOWS\system32>bcdedit
-Windows Boot Manager
---------------------
-identifier              {bootmgr}
-device                  partition=\Device\HarddiskVolume1
-path                    \EFI\Microsoft\Boot\bootmgfw.efi
-description             Windows Boot Manager
-locale                  nl-NL
-inherit                 {globalsettings}
-default                 {current}
-resumeobject            {6beefd36-680a-11eb-ac07-a7444769703e}
-displayorder            {current}
-toolsdisplayorder       {memdiag}
-timeout                 0
-Windows Boot Loader
--------------------
-identifier              {current}
-device                  partition=C:
-path                    \WINDOWS\system32\winload.efi
-description             Windows 10
-locale                  nl-NL
-inherit                 {bootloadersettings}
-recoverysequence        {5c5834f8-aff6-11e9-ac26-ce270aa00281}
-displaymessageoverride  Recovery
-recoveryenabled         Yes
-isolatedcontext         Yes
-allowedinmemorysettings 0x15000075
-osdevice                partition=C:
-systemroot              \WINDOWS
-resumeobject            {6beefd36-680a-11eb-ac07-a7444769703e}
-nx                      OptIn
-bootmenupolicy          Standard
-</code>
-<code>
-bcdedit /set {bootmgr} path \EFI\debian\grubx64.efi
-bcdedit /set {bootmgr} path \EFI\Microsoft\Boot\bootmgfw.efi
-bcdedit /enum firmware
-bcdedit /timeout 10
-bcdedit /copy {current} /d "Linux"
-</code>
-<code>
-Windows Boot Manager
---------------------
-identifier              {6beefd39-680a-11eb-ac07-a7444769703e}
-device                  partition=\Device\HarddiskVolume1
-path                    \EFI\Microsoft\Boot\bootmgfw.efi
-description             Linux
-locale                  nl-NL
-inherit                 {globalsettings}
-default                 {current}
-resumeobject            {6beefd36-680a-11eb-ac07-a7444769703e}
-displayorder            {current}
-toolsdisplayorder       {memdiag}
-timeout                 10
-</code>