Comment 7 for bug 702574

I've reworked Clint+Olivers job such that it *should* now handle all possible 'console=' values.

Currently, it will start a getty for the *first* valid 'console=' value on the kernel command line once the FS is writeable (required for getty to update utmp records). We could make this more flexible (and complex) by adding tty-device-added and instance to allow multiple serial consoles, but this is (probably?) overkill.