Specifications

The threshold for what is and what isn't considered important is set by the console_loglevel variable.
The default is to log anything more important than DEBUG (level 7) to the console. (These levels are defined
in the include file kernel.h) Specifying debug as a boot argument will set the console loglevel to 10, so
that all kernel messages appear on the console.
The console loglevel can usually also be set at run time via an option to the klogd() program. Check the
man page for the version installed on your system to see how to do this.
The `decnet=' Argument
If you are using DECnet, you can supply two comma separated integers here to give your area and node
respectively.
The `devfs=' Argument
If you are using devfs, instead of the standard static devices in /dev/ then you can supply the words only
or mount with this argument. There are also additional debug arguments that are listed in the source.
The `gpt' Argument
If you are using EFI GUID Partition Table handling, you can use this to override problems associated with an
invalid PMBR.
The `idle=' Argument
Setting this to `poll' causes the idle loop in the kernel to poll on the need reschedule flag instead of waiting for
an interrupt to happen. This can result in an improvement in performance on SMP systems (albeit at the cost
of an increase in power consumption).
The `init=' Argument
The kernel defaults to starting the `init' program at boot, which then takes care of setting up the computer for
users via launching getty programs, running `rc' scripts and the like. The kernel first looks for /sbin/init,
then /etc/init (depreciated), and as a last resort, it will try to use /bin/sh (possibly on /etc/rc). If
for example, your init program got corrupted and thus stopped you from being able to boot, you could simply
use the boot prompt init=/bin/sh which would drop you directly into a shell at boot, allowing you to
replace the corrupted program.
The `isapnp=' Argument
This takes the form of: isapnp=read_port,reset,skip_pci_scan,verbose
The `isapnp_reserve_dma=' Argument
This takes the form of: isapnp_reserve_dma=n1,n2,n3,...nN where n1 ... nN are the DMA
channel numbers to not use for PnP.
The Linux BootPrompt−HowTo
The `decnet=' Argument 13