Install fails to see RAID drives - 2 x Seagate SATA 80Gb and Fastrak S150 controller

For some time I have been using Linux as a developer ... not installing/administering it - just using it. So not an expert at installations.

Last week I had my first Ububtu "practise" installing Ubuntu Server on and old P133 ... went perfectly and got everything working as planned very painlessly. Server / Desktop / Development environment ...

Today I am trying to do the "real" install on my server which has had FreeBSD on for the last 3-4 years - I want to totally overwrite/replace it with Ubuntu Server 9.04.

AMD 64 .... (but I am installing 32 for various reasons)
1 Gb RAM
2 x 80 Gb Seagate SCSI drives with RAID 1 ... controlled by a Promise FastTrak S150 (TX2 plus)

I first tried CD with the "Server ISO" .. with no success ... then tried burning the "Alternative 32 ISO" because it says it is for "people with RAID drives" .... but I get the same problem.

Problem:
=======

Install gets as far as detecting disks ... "One or more drives containing SATA RAID Configs have been found - do I wish to activate them? ... Yes or No"

If I say "No" .. it takes me to the partitioning options - Guided/Manual etc ... and then goes on to show me TWO drives:
 - SCSI1
 - SCSI2

If I say "Yes" (to activating)... it goes to "partition disks" and gives me TWO options:
    1) Undo Changes
    2) Finish partitioning and write to disk.

Choosing "Undo Changes" I get a blank screen .... then the PC needs to be reset to get out of it.
Choosing "Finish Partitioning and Write" ..... tells me "no root file system"

I know that other people have used the FastTrak S150 with RAID drives on 9.04 - but I can't work out what I am missing. Maybe it is because the drives still have FreeBSD partitioning on them? ...

I see on the Promise site there is Linux driver source for the card but would not know where to start with it.