suppose I enable CONFIG_CMDLINE_BOOL=y and CONFIG_CMDLINE="...", but I also add a cmdline using efibootmgr via -u option, which one takes precedence and gets executed?

Does an initramfs make this more complicated? does it also have its own cmdline?

  • Gobbel2000@feddit.de
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    1 year ago

    In arch/x86/Kconfig of the kernel tree it says for CMDLINE:

    	  Enter arguments here that should be compiled into the kernel
    	  image and used at boot time.  If the boot loader provides a
    	  command line at boot time, it is appended to this string to
    	  form the full kernel command line, when the system boots.
    
    	  However, you can use the CONFIG_CMDLINE_OVERRIDE option to
    	  change this behavior.
    
    	  In most cases, the command line (whether built-in or provided
    	  by the boot loader) should specify the device for the root
    	  file system.
    

    and for CMDLINE_OVERRIDE:

    	  Set this option to 'Y' to have the kernel ignore the boot loader
    	  command line, and use ONLY the built-in command line.
    
    	  This is used to work around broken boot loaders.  This should
    	  be set to 'N' under normal conditions.
    

    So both commandlines will probably be used. I don’t think an initramfs will normally interfere with the kernel commandline. In any case you can make sure you got what you wanted with cat /proc/cmdline.