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WDe and GPT, booting DOS (Users)

posted by Richard, 23.12.2022, 01:49
(edited by Richard on 23.12.2022, 02:08)

> > > Also works for a GPT 4TB SSD SATA drive with 8 GB DOS 71, 1 TB
> > > Windows 10 and 500 GB Mint 21.1(grub 2.06), and 2200 GB NTFS
> partitions
> > > (but Windows could not be made to triple boot).
> >
> > Congratulations! You're now a member of a very elitist club. :-P
> >
> > > Question.
> > >
> > >
> > > How to edit /boot/grub/grub.cfg?
> >
> > IIRC it's not a very good idea to edit that file directly - it will be
> > overwritten whenever grub or the kernel has been updated.
>
> Quite correct.
>
> This is how to do it....
>
> Edit /etc/default/grub then run update-grub
> (as root or via sudo)
>
> Reboot and you should now be able to get to DOS from the grub menu.











Problem with editing /etc/default/grub


sudo update-grub (no edit changes)


[image]



sudo -i allowed permission to sudoedit /etc/default/grub which originally was


# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'

GRUB_DEFAULT="0"
GRUB_TIMEOUT_STYLE="hidden"
GRUB_TIMEOUT="10"
GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null || echo Debian`"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL="console"

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE="640x480"

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID="true"

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"








edited /etc/default/grub to include MSDOS stuff stuff added at the end



# TEST FOR EDIT_CHANGE
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'

GRUB_DEFAULT="0"
GRUB_TIMEOUT_STYLE="hidden"
GRUB_TIMEOUT="10"
GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null || echo Debian`"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL="console"

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE="640x480"

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID="true"

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"


### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'MS-DOS 5.x/6.x/Win3.1 (on /dev/sda2)' --class ms_dos --class os $menuentry_id_option 'osprober-chain-5230-F0FE' {
insmod part_gpt
insmod fat
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 5230-F0FE
else
search --no-floppy --fs-uuid --set=root 5230-F0FE
fi
drivemap -s (hd0) ${root}
chainloader +1
}
set timeout_style=menu
if [ "${timeout}" = 0 ]; then
set timeout=10
fi
### END /etc/grub.d/30_os-prober ###





sudo update-grub


[image]









/boot/grub/grub.cfg listing




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

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
if [ "${initrdfail}" = 2 ]; then
set initrdfail=
elif [ "${initrdfail}" = 1 ]; then
set next_entry="${prev_entry}"
set prev_entry=
save_env prev_entry
if [ "${next_entry}" ]; then
set initrdfail=2
fi
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
else
set default="0"
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 initrdfail {
if [ -n "${have_grubenv}" ]; then if [ -n "${partuuid}" ]; then
if [ -z "${initrdfail}" ]; then
set initrdfail=1
if [ -n "${boot_once}" ]; then
set prev_entry="${default}"
save_env prev_entry
fi
fi
save_env initrdfail
fi; fi
}
function recordfail {
set recordfail=1
if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}
function load_video {
if [ x$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
}

if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_gpt
insmod ext2
set root='hd0,gpt8'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt8 --hint-efi=hd0,gpt8 --hint-baremetal=ahci0,gpt8 f19f7536-4cd7-40d4-b785-1ed717ec0ccf
else
search --no-floppy --fs-uuid --set=root f19f7536-4cd7-40d4-b785-1ed717ec0ccf
fi
font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_AU
insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ] ; then
set timeout=30
else
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=hidden
set timeout=10
# Fallback hidden-timeout code in case the timeout_style feature is
# unavailable.
elif sleep --interruptible 10 ; then
set timeout=0
fi
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
set gfxpayload="${1}"
if [ "${1}" = "keep" ]; then
set vt_handoff=vt.handoff=7
else
set vt_handoff=
fi
}
if [ "${recordfail}" != 1 ]; then
if [ -e ${prefix}/gfxblacklist.txt ]; then
if [ ${grub_platform} != pc ]; then
set linux_gfx_mode=keep
elif hwmatch ${prefix}/gfxblacklist.txt 3; then
if [ ${match} = 0 ]; then
set linux_gfx_mode=keep
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=keep
fi
else
set linux_gfx_mode=text
fi
export linux_gfx_mode
menuentry 'Linux Mint 21.1 Cinnamon' --class linuxmint --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-f19f7536-4cd7-40d4-b785-1ed717ec0ccf' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_gpt
insmod ext2
set root='hd0,gpt8'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt8 --hint-efi=hd0,gpt8 --hint-baremetal=ahci0,gpt8 f19f7536-4cd7-40d4-b785-1ed717ec0ccf
else
search --no-floppy --fs-uuid --set=root f19f7536-4cd7-40d4-b785-1ed717ec0ccf
fi
linux /boot/vmlinuz-5.15.0-56-generic root=UUID=f19f7536-4cd7-40d4-b785-1ed717ec0ccf ro quiet splash
initrd /boot/initrd.img-5.15.0-56-generic
}
submenu 'Advanced options for Linux Mint 21.1 Cinnamon' $menuentry_id_option 'gnulinux-advanced-f19f7536-4cd7-40d4-b785-1ed717ec0ccf' {
menuentry 'Linux Mint 21.1 Cinnamon, with Linux 5.15.0-56-generic' --class linuxmint --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-56-generic-advanced-f19f7536-4cd7-40d4-b785-1ed717ec0ccf' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_gpt
insmod ext2
set root='hd0,gpt8'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt8 --hint-efi=hd0,gpt8 --hint-baremetal=ahci0,gpt8 f19f7536-4cd7-40d4-b785-1ed717ec0ccf
else
search --no-floppy --fs-uuid --set=root f19f7536-4cd7-40d4-b785-1ed717ec0ccf
fi
echo 'Loading Linux 5.15.0-56-generic ...'
linux /boot/vmlinuz-5.15.0-56-generic root=UUID=f19f7536-4cd7-40d4-b785-1ed717ec0ccf ro quiet splash
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-5.15.0-56-generic
}
menuentry 'Linux Mint 21.1 Cinnamon, with Linux 5.15.0-56-generic (recovery mode)' --class linuxmint --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-56-generic-recovery-f19f7536-4cd7-40d4-b785-1ed717ec0ccf' {
recordfail
load_video
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_gpt
insmod ext2
set root='hd0,gpt8'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt8 --hint-efi=hd0,gpt8 --hint-baremetal=ahci0,gpt8 f19f7536-4cd7-40d4-b785-1ed717ec0ccf
else
search --no-floppy --fs-uuid --set=root f19f7536-4cd7-40d4-b785-1ed717ec0ccf
fi
echo 'Loading Linux 5.15.0-56-generic ...'
linux /boot/vmlinuz-5.15.0-56-generic root=UUID=f19f7536-4cd7-40d4-b785-1ed717ec0ccf ro recovery nomodeset dis_ucode_ldr
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-5.15.0-56-generic
}
}

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

### BEGIN /etc/grub.d/11_linux_zfs ###
### END /etc/grub.d/11_linux_zfs ###

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

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

### BEGIN /etc/grub.d/30_os-prober_proxy ###


set timeout_style=menu
if [ "${timeout}" = 0 ]; then
set timeout=10
fi
### END /etc/grub.d/30_os-prober_proxy ###

### BEGIN /etc/grub.d/40_custom_proxy ###
menuentry "Windows Boot Manager (on /dev/sda5)" --class windows --class os $menuentry_id_option 'osprober-efi-202E-600C' {
insmod part_gpt
insmod fat
set root='hd0,gpt5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt5 --hint-efi=hd0,gpt5 --hint-baremetal=ahci0,gpt5 202E-600C
else
search --no-floppy --fs-uuid --set=root 202E-600C
fi
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}
### END /etc/grub.d/40_custom_proxy ###

### BEGIN /etc/grub.d/41_os-prober_proxy ###
### END /etc/grub.d/41_os-prober_proxy ###

### BEGIN /etc/grub.d/42_uefi-firmware ###
menuentry 'UEFI Firmware Settings' $menuentry_id_option 'uefi-firmware' {
fwsetup
}
### END /etc/grub.d/42_uefi-firmware ###

### BEGIN /etc/grub.d/43_fwupd ###
### END /etc/grub.d/43_fwupd ###

### BEGIN /etc/grub.d/44_custom_proxy ###

# 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/44_custom_proxy ###

### BEGIN /etc/grub.d/45_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/45_custom ###









How to fix the editing of /etc/default/grub to make sudo update-grub include MSDOS?












EDIT to ORIGINAL POST


[image]






/dev/sda2 is where MS-DOS 7.1 is located (label GPT_D71)

.

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