Some i.MX6 boards use ttymxc2 and even ttymxc3 for their serial console, however our /etc/securetty only lists ttymxc0 and ttymxc1 so every time someone goes to install on an i.MX6 board they may need to edit that file. Reproducible: Always I'm not sure if this is a bug that should be opened upstream, or if that's a file we ourselves created.
should be all set now in the tree; thanks for the report! Commit message: Add ttymxc{2,3} http://sources.gentoo.org/sys-apps/shadow/shadow-4.1.5.1-r1.ebuild?r1=1.13&r2=1.14