Background
You may need customized parameters when starting Linux for certain special devices (exceptional hardware or specialized devices). This allows you to activate or deactivate certain functions of the kernel or modify the behavior. For example, the automatic search and initialization of disks can be changed to avoid problems when starting up with the controllers.
Adjustment for BIOS boot
The BIOS boot is done via Syslinux. The configuration file live.cfg can be found in the /boot/live folder.
Adjustment for EFI boot
The EFI boot is done via GRUB. The grub.cfg configuration file can be found in the /boot/grub folder
List of all available kernel parameters
A complete list of all Linux kernel parameters can be found here:
https://www.kernel.org/doc/html/v4.14/admin-guide/kernel-parameters.html