Yep, looks familiar. It appears to have something to do with the fact that the MBP and therefore PD does't have a real serual port (which is typicaly what a UART chip is used for, that or a modem).
I had the exact same issue under beta 6, RC1 and stil with RC2. I've given up on Solaris.
Somewhere on the forum is a post with some suggestions on how to spoof PD to install. Search for Solaris and try them if yu want to keep going.
Cheers,
Peter