Re: Current boot options

[mlelstv%serpens.de@localhost (Michael van Elst)]

db7%SDF.ORG@localhost (Diogo) writes:

>I'm looking for a mechanism to see what options were passed to the kernel when 
>booting. In Linux that is typically stored in /proc/cmdline. How to figure that 
>out in NetBSD?

There is no command line, and the kernel doesn't take many options.

Some information can be retrieved with sysctl (e.g. sysctl kern.boothowto).

kern.boothowto is a number that combines bitmasks for the various options
from boothowto(9), e.g.

RB_ASKNAME   0x00000001  -a
RB_SINGLE    0x00000002  -s
RB_HALT      0x00000008  -b
RB_KDB       0x00000040  -d
RB_MINIROOT  0x00000200  -m
RB_USERCONF  0x00001000  -c
AB_QUIET     0x00010000  -q
AB_VERBOSE   0x00020000  -v
AB_SILENT    0x00040000  -z
AB_DEBUG     0x00080000  -x
RB_MD1       0x10000000  -1
RB_MD2       0x20000000  -2
RB_MD3       0x40000000  -3
RB_MD4       0x80000000  -4

kern.consdev is the device used as the kernel console. That is usually deduced
from an option in the bootloader (e.g. console=pc on a platform using wscons
would usually result in kern.consdev being /dev/ttyE0).

kern.root_device is the device mounted as /, which is either deduced from
the boot process or from an explicit option to the bootloader.

machdep.booted_kernel is the name of the kernel that was loaded, either a
default searched on the disk or passed explicitely to the bootloader.