As recently discussed on the list:
http://lists.busybox.net/pipermail/buildroot/2017-January/182147.html
eudev no longer has legacy user space firmware loading and the
--with-firmware-path configure flag since the 3.1.3 release:
commit
3b717594600fa717cdf9bcfd0c7c1b703b245482
Author: Kay Sievers <kay@vrfy.org>
Date: Mon Sep 1 09:07:49 2014 -0400
udev: remove userspace firmware loading support
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
So drop it from EUDEV_CONF_OPTS to limit confusion.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
--disable-manpages \
--sbindir=/sbin \
--libexecdir=/lib \
- --with-firmware-path=/lib/firmware \
--disable-introspection \
--enable-kmod \
--enable-blkid