title: how to send kernel command line parameter in raspbian
body: <p>I need to send kernel command line parameter in raspbian os to turn off spectre/meltdown patches. as i know we can do this in other linux distros through "/etc/default/grub" file by changing "GRUB_CMDLINE_LINUX=". but in raspbian os this file did not exist and even "grub-update" command and also "grub-mkconfig" did not installed.</p>
  
  <p>could anyone tell me how i can pass kernel command line parameter in raspbian os?</p>