On Thu, Aug 15, 2024 at 09:04:30PM -0000, Michael van Elst wrote: > d...@sdf.org (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. >
Thank you for the detailed explanation, I can write a small program to fetch that info if necessary.
