As of version 2.0 upstream, the serial support is configurable at boot instead of compile so if the version upstream now (2.01) is added, closing bug 468780, then it will fix this too. Thanks!
from http://www.memtest.org/#change Enhancements in v2.00 : ... # Added serial support as a linux boot parameter (Thanks to Michal S.) Nick Schmalenberger -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

