Udev/Upgrade Guide

udev 200
The following special attention is required:


 * CONFIG_DEVTMPFS=y must be set in the kernel.


 * If there is a /dev line in /etc/fstab, it must have the devtmpfs filesystem type or it will conflict with the above options.


 * Remove udev-postmount from any runlevels, it is not necessary.


 * If you are using /etc/udev/rules.d/70-persistent-net.rules, read [bug #453494]; this won't be a problem if you use [Predictable Network Interface Names].


 * Since this version, support for older kernels than 2.6.32 is dropped. The 9999 version needs 2.6.39 or higher.

Upgrading to the latest gentoo-sources version is also recommended.

For more details, read the full news article /usr/portage/metadata/news/2013-03-29-udev-upgrade/2013-03-29-udev-upgrade.en.txt and the post install output of emerging udev.