After dealing with the headless install problems (#2602, time to resolution: 25 days), and then then headless /etc/inittab problems (#3208, still open), I'm now unable to log in as root on the console of my headless system. The problem is that the /etc/securetty file distributed with RedHat 6.0 does not include ttyS0 or ttyS1. Workaround: edit /etc/securetty. Add "ttyS0". Solution: Rip the keyboard and monitor off your existing Sparc systems, run a serial cable to a PC, and try out a complete headless install, from beginning to end. Make sure it works. Release errata.
I have verified that /etc/securetty does not include entries for serial consoles. Thank you for the suggestion. It has been assigned to a developer for further review.
We can't add ttyS[01] to /etc/securetty because dialin lines are usually insecure. This needs to be dealt with in the installer. I'm preserving the bug by rsolving to the REMIND state.