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How to switch from Kernel Huge to Generic?

At the end of this recipe the user will be able to switch from Kernel huge to Kernel Generic on Slackware, and enjoy its benefits. You may be wondering what benefit to realize is exchange. The benefits of switching from Huge to Generic are:

  • More fluidity and faster boot, due to Generic loading only the modules your machine needs.
  • The modules are not embedded, thus giving better flexibility.

So what is Kernel Huge for? Simple, because it has huge support for many drivers, it is ideal for use in installing the system. Thus allowing to reach a larger number of machines. After installation Huge is no longer needed, which is why we should make the switch.

Starting the recipe

Login as root, every process will be done by the superuser, after that we will execute the command 'mkinitrd_command_generator.sh' which is present in /usr/share/mkinitrd

<code> /usr/share/mkinitrd/mkinitrd_command_generator.sh </code>

The output will be from the mkinitrd command with the modules necessary for the operation of your machine. Example:

/usr/share/mkinitrd/mkinitrd_command_generator.sh
#
# mkinitrd_command_generator.sh revision 1.45
#
# This script will now make a recommendation about the command to use
# in case you require an initrd image to boot a kernel that does not
# have support for your storage or root filesystem built in
# (such as the Slackware 'generic' kernels').
# A suitable 'mkinitrd' command will be:

mkinitrd -c -k 4.4.172 -f ext4 -r /dev/sda1 -m 
usb-storage:ehci-hcd:ehci-pci:xhci-pci:ohci-pci:xhci-hcd:uhci-hcd:hid:  \  
usbhid:i2c-hid:hid_generic:hid-cherry:hid-logitech:hid-logitech-dj:     \
hid-logitech-hidpp:hid-lenovo:hid-microsoft:hid_multitouch:jbd2:mbcache:\
ext4 -u -o /boot/initrd.gz

Copy the entire line where it starts with the command 'mkinitrd -c -k ….' and right after that paste it into your terminal. The mkinitrd command will be executed and will have output in this format:

**mkinitrd -c -k 4.4.172 -f ext4 -r /dev/sda1 -m usb-storage:ehci-hcd:ehci-pci:xhci-pci:ohci-pci:xhci-hcd:uhci-hcd:hid:\ usbhid:i2c-hid:hid_generic:hid-cherry:hid-logitech:hid-logitech-dj:\ hid-logitech-hidpp:hid-lenovo:hid-microsoft:hid_multitouch:jbd2:mbcache:\ ext4 -u -o /boot/initrd.gz**

OK: /lib/modules/4.4.172/kernel/drivers/usb/storage/usb-storage.ko added.
OK: /lib/modules/4.4.172/kernel/drivers/usb/host/ehci-hcd.ko added.
OK: /lib/modules/4.4.172/kernel/drivers/usb/host/ehci-hcd.ko added.
OK: /lib/modules/4.4.172/kernel/drivers/usb/host/ehci-pci.ko added.
...
38432 blocks
/boot/initrd.gz created.
Be sure to run lilo again if you use it.

After that we will enter in lilo the information needed for Kernel Generic to be able to load, you can do this manually or you can simply run the command: '/usr/share/mkinitrd/mkinitrd_command_generator.sh' with the -l option then pass the full path to the location of vmlinuz-generic.

**/usr/share/mkinitrd/mkinitrd_command_generator.sh -l \ /boot/vmlinuz-generic-4.4.172**
image = /boot/vmlinuz-generic-4.4.172
  initrd = /boot/initrd.gz
  root = /dev/sda1
  label = 4.4.172
  read-only
# Linux bootable partition config ends

Now let's add the information in lilo.conf present in: /etc/lilo.conf Add the information in the last line lilo.conf It is extremely important that you do NOT delete the Kernel Huge call, always leave it in case of tragedy with your system. . This for a possible rescue.

Change the label to a better name like KGeneric or something, this label is responsible for appearing on the Lilo screen. With a better name it is easier for you to identify him. After you have done the whole process run lilo for the new settings to be loaded:

**lilo**

Warning: LBA32 addressing assumed
Added Linux  *
Added Generic  +
One warning was issued.

Ready! Now just reboot your machine and select Kernel Generic.

Sources


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