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Date: Thu, 19 May 2011 13:23:17 +0100
From: Tim Cussins <timcussins@eml.cc>
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To: poky@pokylinux.org
Subject: strangeness: udhcpc runs when 'ip=dhcp' is in kernel cmdline
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Hi all,

i've built my own kernel and image for our development system, and i've 
been mounting the rootfs image over NFS.

the kernel successfully does dhcp before mounting the NFS share - then 
udhcpc kicks in because the busybox-udhcp script looks for 'ip=dhcp' in 
the kernel command line (/proc/cmdline), launching udhcpc if it's 
present. does this seem odd to anyone?

AFAIK ip=dhcp is only really used for NFS root mounts, and i guess i 
assumed that the kernel would also be responsible for maintaining the 
DHCP lease. I might be wrong there.

http://www.mjmwired.net/kernel/Documentation/filesystems/nfs/nfsroot.txt#81

If anyone can shed some light on this, that'd be cool.

Cheers,
Tim