Re: How do I change the grub kernel boot parameters in F32 ?

[Stephen Morris <samorris@xxxxxxxxxxxxxxx>]

    On 10/6/20 2:42 pm, linux guy wrote:

c1d3ebaecd08428ba86f4aba3749efca-5.6.16-300.fc32.x86_64.conf as it sits now:

title Fedora (5.6.16-300.fc32.x86_64) 32 (Thirty Two)

version 5.6.16-300.fc32.x86_64
linux /vmlinuz-5.6.16-300.fc32.x86_64
initrd /initramfs-5.6.16-300.fc32.x86_64.img
options $kernelopts
grub_users $grub_users
grub_arg --unrestricted

grub_class kernel

Edited /etc/default/grub to this:

GRUB_TIMEOUT="5"
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT="saved"
GRUB_DISABLE_SUBMENU="true"
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="rd.driver.blacklist=nouveau modprobe.blacklist=nouveau nvidia-drm.modeset=1 rd.l>
GRUB_DISABLE_RECOVERY="true"
GRUB_ENABLE_BLSCFG="true"

# grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
Generating grub configuration file ...
Adding boot menu entry for EFI firmware configuration
done

# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Adding boot menu entry for EFI firmware configuration
done

c1d3ebaecd08428ba86f4aba3749efca-5.6.16-300.fc32.x86_64.conf after running these.

Title Fedora (5.6.16-300.fc32.x86_64) 32 (Thirty Two)
version 5.6.16-300.fc32.x86_64
linux /vmlinuz-5.6.16-300.fc32.x86_64
initrd /initramfs-5.6.16-300.fc32.x86_64.img
options $kernelopts
grub_users $grub_users
grub_arg --unrestricted
grub_class kernel

from nano /boot/efi/EFI/fedora/grub.cfg:

===================================================

# 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/.

# The kernelopts variable should be defined in the grubenv file. But to ensure that menu
# entries populated from BootLoaderSpec files that use this variable work correctly even
# without a grubenv file, define a fallback kernelopts variable if this has not been set.
#
# The kernelopts variable in the grubenv file can be modified using the grubby tool or by
# executing the grub2-mkconfig tool. For the latter, the values of the GRUB_CMDLINE_LINUX
# and GRUB_CMDLINE_LINUX_DEFAULT options from /etc/default/grub file are used to set both
# the kernelopts variable in the grubenv file and the fallback kernelopts variable.
if [ -z "${kernelopts}" ]; then
  set kernelopts="root=/dev/mapper/fedora_localhost--live-root ro rd.driver.blacklist=nouveau modpro>
fi

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

================================================

This is as far as I got with the instructions in your post. I'll finish this later.

    As I understand the processes, those two blscfg statements are what
    controls the kernels displayed and kernel commands issues in the
    boot menu. As I specified in another thread, when this standard was
    introduced, I think if F31, I was always using grub2-mkconfig to
    generate the grub menus and the introduction of the blscfg standard
    caused the usage of grub2-mkconfig to not make any difference to the
    menus shown at boot time, and people on this mailing list told me to
    disable blscfg in /etc/default/grub, which having done that causes
    grub2-mkconfig to actually work.
        Also as I understand it /boot/grub2/grub.cfg is the grub config
    file used to generate the grub menus for legacy booting, where to
    get that structure into the mbr you need to issue grub2-install,
    and, the /boot/efi/EFI/fedora/grub.cfg is what is used for efi
    booting and in that scenario you do not need to issue grub2-install.
    
    regards,
    Steve

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