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Re: I need Dual Legacy EFI help

From: ToddAndMargo
Subject: Re: I need Dual Legacy EFI help
Date: Tue, 14 May 2019 04:50:19 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 
On 5/14/19 12:16 AM, Pascal Hambourg wrote:

Le 14/05/2019 à 04:07, ToddAndMargo a écrit :

On 5/13/19 8:43 AM, Pascal Hambourg wrote:

Le 05/05/2019 à 11:11, ToddAndMargo a écrit :


How do I trick grub2-mkconfig to make me a Legacy boot
when I am booted into EFI?


You can try to boot with the "noefi" kernel parameter.
Or unmount pstore and efivar filesystems and unload efi kernel modules.


This is a change from Fedroa 29 to 30.  "grub2-mkconfig" now hunts
down what type of boot you have and generates a grub.cfg
accordingly.


Can you show samples of this change in grub.cfg ?


I really don't know what to look for, but I will attach samples.
The change was in grub2-mkconfig anyway..

And I have no idea where to put the parameter, as grub.cfg is
changed in F30.

A lot of the data is stored elsewhere:

# ls /etc/grub.d
00_header             10_reset_boot_success  30_os-prober      README
01_users              12_menu_auto_hide      30_uefi-firmware
08_fallback_counting  20_linux_xen           40_custom
10_linux              20_ppc_terminfo        41_custom



Now if I could boot from legacy, I could generate a legacy
grub.cfg, but since it won't boot into legacy, I am stuck.
Did you try to boot with "noefi" in the kernel command line as I suggested ? It disables EFI services and may trick grub2-mkconfig into thinking that it was not booted in EFI mode. 

I tried just copying a grub.cfg from a legacy F30 machine,
but I did not get the UUID's correct.  )Or knew where thye
would actually go.)


Attached: F30 legacy, F30 EFI, F28 EFI



Here is a grub from a F30 legacy machine:

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
set pager=1

if [ -f ${config_directory}/grubenv ]; then
  load_env -f ${config_directory}/grubenv
elif [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="${saved_entry}"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

terminal_output console
if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
  set timeout=5
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/01_users ###
if [ -f ${prefix}/user.cfg ]; then
  source ${prefix}/user.cfg
  if [ -n "${GRUB2_PASSWORD}" ]; then
    set superusers="root"
    export superusers
    password_pbkdf2 root ${GRUB2_PASSWORD}
  fi
fi
### END /etc/grub.d/01_users ###

### BEGIN /etc/grub.d/08_fallback_counting ###
insmod increment
# Check if boot_counter exists and boot_success=0 to activate this behaviour. 
if [ -n "${boot_counter}" -a "${boot_success}" = "0" ]; then
  # if countdown has ended, choose to boot rollback deployment,
  # i.e. default=1 on OSTree-based systems.
  if  [ "${boot_counter}" = "0" -o "${boot_counter}" = "-1" ]; then
    set default=1
    set boot_counter=-1
  # otherwise decrement boot_counter
  else
    decrement boot_counter
  fi
  save_env boot_counter
fi
### END /etc/grub.d/08_fallback_counting ###

### BEGIN /etc/grub.d/10_linux ###
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1' c9098874-5f3b-49cf-8efe-321f491342ef 
else
search --no-floppy --fs-uuid --set=root c9098874-5f3b-49cf-8efe-321f491342ef 
fi
insmod part_msdos
insmod ext2
set boot='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=boot --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1' c9098874-5f3b-49cf-8efe-321f491342ef 
else
search --no-floppy --fs-uuid --set=boot c9098874-5f3b-49cf-8efe-321f491342ef 
fi
# This section was generated by a script. Do not modify the generated file - all changes # will be lost the next time file is regenerated. Instead edit the BootLoaderSpec files. 
#
# The blscfg command parses the BootLoaderSpec files stored in /boot/loader/entries and # populates the boot menu. Please refer to the Boot Loader Specification documentation # for the files format: https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/.
set default_kernelopts="root=UUID=eaf90e70-9ccc-42c3-b741-94d5dd4b1e33 ro rd.luks.uuid=luks-9ef18ec8-bbbe-45b9-a47c-f9d6f95ade2c rd.luks.uuid=luks-67dd02fb-6771-41b9-802d-e5a2043bddb0 rhgb quiet " 

insmod blscfg
blscfg
if [ -s $prefix/grubenv ]; then
  load_env
fi
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/10_reset_boot_success ###
insmod increment
# Hiding the menu is ok if last boot was ok or if this is a first boot attempt to boot the entry 
if [ "${boot_success}" = "1" -o "${boot_indeterminate}" = "1" ]; then
  set menu_hide_ok=1
else
  set menu_hide_ok=0
fi
# Reset boot_indeterminate after a successful boot, increment otherwise
if [ "${boot_success}" = "1" ] ; then
  set boot_indeterminate=0
else
  increment boot_indeterminate
fi
# Reset boot_success for current boot
set boot_success=0
save_env boot_success boot_indeterminate
### END /etc/grub.d/10_reset_boot_success ###

### BEGIN /etc/grub.d/12_menu_auto_hide ###
if [ x$feature_timeout_style = xy ] ; then
  if [ "${menu_show_once}" ]; then
    unset menu_show_once
    save_env menu_show_once
    set timeout_style=menu
    set timeout=60
  elif [ "${menu_auto_hide}" -a "${menu_hide_ok}" = "1" ]; then
    set orig_timeout_style=${timeout_style}
    set orig_timeout=${timeout}
    if [ "${fastboot}" = "1" ]; then
# timeout_style=menu + timeout=0 avoids the countdown code keypress check 
      set timeout_style=menu
      set timeout=0
    else
      set timeout_style=hidden
      set timeout=1
    fi
  fi
fi
### END /etc/grub.d/12_menu_auto_hide ###

### BEGIN /etc/grub.d/20_linux_xen ###

### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_ppc_terminfo ###
### END /etc/grub.d/20_ppc_terminfo ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
### END /etc/grub.d/30_uefi-firmware ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the 
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###




This is from an F30 EFI machine:

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
set pager=1

if [ -f ${config_directory}/grubenv ]; then
  load_env -f ${config_directory}/grubenv
elif [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="${saved_entry}"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

terminal_output console
if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
  set timeout=5
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/01_fallback_counting ###
insmod increment
# Check if boot_counter exists and boot_success=0 to activate this behaviour. 
if [ -n "${boot_counter}" -a "${boot_success}" = "0" ]; then
# if countdown has ended, choose to boot rollback deployment (default=1 on 
  # OSTree-based systems)
  if  [ "${boot_counter}" = "0" -o "${boot_counter}" = "-1" ]; then
    set default=1
    set boot_counter=-1
  # otherwise decrement boot_counter
  else
    decrement boot_counter
  fi
  save_env boot_counter
fi
### END /etc/grub.d/01_fallback_counting ###

### BEGIN /etc/grub.d/01_menu_auto_hide ###
if [ "${boot_success}" = "1" -o "${boot_indeterminate}" = "1" ]; then
  set last_boot_ok=1
else
  set last_boot_ok=0
fi

# Reset boot_indeterminate after a successful boot
if [ "${boot_success}" = "1" ] ; then
  set boot_indeterminate=0
# Avoid boot_indeterminate causing the menu to be hidden more then once
elif [ "${boot_indeterminate}" = "1" ]; then
  set boot_indeterminate=2
fi
set boot_success=0
save_env boot_success boot_indeterminate

if [ x$feature_timeout_style = xy ] ; then
  if [ "${menu_show_once}" ]; then
    unset menu_show_once
    save_env menu_show_once
    set timeout_style=menu
    set timeout=60
  elif [ "${menu_auto_hide}" -a "${last_boot_ok}" = "1" ]; then
    set orig_timeout_style=${timeout_style}
    set orig_timeout=${timeout}
    if [ "${fastboot}" = "1" ]; then
# timeout_style=menu + timeout=0 avoids the countdown code keypress check 
      set timeout_style=menu
      set timeout=0
    else
      set timeout_style=hidden
      set timeout=1
    fi
  fi
fi
### END /etc/grub.d/01_menu_auto_hide ###

### BEGIN /etc/grub.d/01_users ###
if [ -f ${prefix}/user.cfg ]; then
  source ${prefix}/user.cfg
  if [ -n "${GRUB2_PASSWORD}" ]; then
    set superusers="root"
    export superusers
    password_pbkdf2 root ${GRUB2_PASSWORD}
  fi
fi
### END /etc/grub.d/01_users ###

### BEGIN /etc/grub.d/10_linux ###
insmod part_gpt
insmod ext2
set root='hd0,gpt3'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt3 --hint-efi=hd0,gpt3 --hint-baremetal=ahci0,gpt3 cd4da110-2353-43d0-8fbf-e82d6d795dfb 
else
search --no-floppy --fs-uuid --set=root cd4da110-2353-43d0-8fbf-e82d6d795dfb 
fi
insmod part_gpt
insmod fat
set boot='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=boot --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 985C-CBDE 
else
  search --no-floppy --fs-uuid --set=boot 985C-CBDE
fi
# This section was generated by a script. Do not modify the generated file - all changes # will be lost the next time file is regenerated. Instead edit the BootLoaderSpec files. 
#
# The blscfg command parses the BootLoaderSpec files stored in /boot/loader/entries and # populates the boot menu. Please refer to the Boot Loader Specification documentation # for the files format: https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/.
set default_kernelopts="root=UUID=b8616ae1-39ee-45dd-bfc6-b2cb5f22921f ro resume=UUID=5da7eab6-6440-4e44-9ad9-3fd1a17dbb1d rhgb quiet " 

insmod blscfg
blscfg
if [ -s $prefix/grubenv ]; then
  load_env
fi
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###

### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_ppc_terminfo ###
### END /etc/grub.d/20_ppc_terminfo ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
menuentry 'System setup' $menuentry_id_option 'uefi-firmware' {
        fwsetup
}
### END /etc/grub.d/30_uefi-firmware ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the 
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###





F28 EFI:

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
set pager=1

if [ -f ${config_directory}/grubenv ]; then
  load_env -f ${config_directory}/grubenv
elif [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="${saved_entry}"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

terminal_output console
if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
  set timeout=5
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/01_users ###
if [ -f ${prefix}/user.cfg ]; then
  source ${prefix}/user.cfg
  if [ -n "${GRUB2_PASSWORD}" ]; then
    set superusers="root"
    export superusers
    password_pbkdf2 root ${GRUB2_PASSWORD}
  fi
fi
### END /etc/grub.d/01_users ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Fedora (5.0.11-200.fc29.x86_64) 29 (Twenty Nine)' --class fedora --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-4.13.9-300.fc27.x86_64-advanced-d2d22e5a-2425-4cd2-89e8-e7ebafc40638' { 
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod ext2
        if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root f3edab67-2614-4c23-a4d1-fc78b37d74f3 
        else
search --no-floppy --fs-uuid --set=root f3edab67-2614-4c23-a4d1-fc78b37d74f3 
        fi
linuxefi /vmlinuz-5.0.11-200.fc29.x86_64 root=/dev/mapper/luks-903bc691-a0f0-42bc-aa96-4233a7edc0e9 ro rd.luks.uuid=luks-903bc691-a0f0-42bc-aa96-4233a7edc0e9 rd.luks.uuid=luks-c72067fc-1742-4628-affc-f80b14974beb rhgb quiet LANG=en_US.UTF-8 
        initrdefi /initramfs-5.0.11-200.fc29.x86_64.img
}
menuentry 'Fedora (5.0.9-200.fc29.x86_64) 29 (Twenty Nine)' --class fedora --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-4.13.9-300.fc27.x86_64-advanced-d2d22e5a-2425-4cd2-89e8-e7ebafc40638' { 
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod ext2
        if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root f3edab67-2614-4c23-a4d1-fc78b37d74f3 
        else
search --no-floppy --fs-uuid --set=root f3edab67-2614-4c23-a4d1-fc78b37d74f3 
        fi
linuxefi /vmlinuz-5.0.9-200.fc29.x86_64 root=/dev/mapper/luks-903bc691-a0f0-42bc-aa96-4233a7edc0e9 ro rd.luks.uuid=luks-903bc691-a0f0-42bc-aa96-4233a7edc0e9 rd.luks.uuid=luks-c72067fc-1742-4628-affc-f80b14974beb rhgb quiet LANG=en_US.UTF-8 
        initrdefi /initramfs-5.0.9-200.fc29.x86_64.img
}
menuentry 'Fedora (5.0.7-200.fc29.x86_64) 29 (Twenty Nine)' --class fedora --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-4.13.9-300.fc27.x86_64-advanced-d2d22e5a-2425-4cd2-89e8-e7ebafc40638' { 
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod ext2
        if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root f3edab67-2614-4c23-a4d1-fc78b37d74f3 
        else
search --no-floppy --fs-uuid --set=root f3edab67-2614-4c23-a4d1-fc78b37d74f3 
        fi
linuxefi /vmlinuz-5.0.7-200.fc29.x86_64 root=/dev/mapper/luks-903bc691-a0f0-42bc-aa96-4233a7edc0e9 ro rd.luks.uuid=luks-903bc691-a0f0-42bc-aa96-4233a7edc0e9 rd.luks.uuid=luks-c72067fc-1742-4628-affc-f80b14974beb rhgb quiet LANG=en_US.UTF-8 
        initrdefi /initramfs-5.0.7-200.fc29.x86_64.img
}
menuentry 'Fedora (0-rescue-25f870556c344b599c639eb386296fa2) 27 (Twenty Seven)' --class fedora --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-25f870556c344b599c639eb386296fa2-advanced-d2d22e5a-2425-4cd2-89e8-e7ebafc40638' { 
        load_video
        insmod gzio
        insmod part_gpt
        insmod ext2
        if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root f3edab67-2614-4c23-a4d1-fc78b37d74f3 
        else
search --no-floppy --fs-uuid --set=root f3edab67-2614-4c23-a4d1-fc78b37d74f3 
        fi
linuxefi /vmlinuz-0-rescue-25f870556c344b599c639eb386296fa2 root=UUID=d2d22e5a-2425-4cd2-89e8-e7ebafc40638 ro rd.luks.uuid=luks-903bc691-a0f0-42bc-aa96-4233a7edc0e9 rd.luks.uuid=luks-c72067fc-1742-4628-affc-f80b14974beb rhgb quiet 
        initrdefi /initramfs-0-rescue-25f870556c344b599c639eb386296fa2.img
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###

### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_ppc_terminfo ###
### END /etc/grub.d/20_ppc_terminfo ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the 
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
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