[syslinux] passing parameters to the newly booted kernel
Luciano Rocha
strange at nsk.no-ip.org
Wed Mar 26 07:30:02 PDT 2008
On Wed, Mar 26, 2008 at 09:07:40AM -0400, Andrew Hume wrote:
> is it possible to pass parameters from a .cfg file to the newly
> booted kernel?
>
> my setup is pxelinux where the relevent config is
>
> label fbsd63
> kernel memdisk
> append initrd=/freebsd6.3.hd harddisk
>
> what i would like to do is pass in some parameter so the booted
> kernel can behave differently.
> i've looked in teh archives without success, although i did see an
> elliptic reference
> to /proc/cmdline from within /linuxrc.
All arguments to the kernel are accessible via /proc/cmdline. Also,
unrecognized var=val arguments are passed in the environment to the boot
process (/sbin/init, /init).
Usually, I parse /proc/cmdline like this:
cmd=" $(cat /proc/cmdline) "
getval()
{
local val
val="${cmd##* $1=}"
[ "$val" != "$cmd" ] || return 1
echo "${val%% *}"
}
Then:
root=$(getval root)
> i boot both freebsd and linux kernels, so answers for both would be
> welcome.
Can't help you with freebsd, sorry.
--
lfr
0/0
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