Hi,

just a note - it seems that there is no support for this hw in NetBSD. 
Still it's possible to download free (part of a README file pasted 
bellow) source code of a driver for FreeBSD. So if someone with the 
appropriate skills wants to, it probably could be possible to add 
support for NetBSD as well. You can download the code from the following 
address:
http://www.highpoint-tech.com/USA/bios_rr2220.htm
(http://www.highpoint-tech.com/).

part of a README file:
****
RocketRAID 2220 Controller Driver for FreeBSD
Copyright (C) 2005 HighPoint Technologies, Inc. All rights reserved.

#############################################################################
Revision History:

    v1.01 2005-8-30
          First source code release

#############################################################################

1. Overview
---------------------
   This package contains FreeBSD driver source code for HighPoint 
RocketRAID
   222x SATA controller.

   NO WARRANTY

   THE DRIVER SOURCE CODE HIGHPOINT PROVIDED IS FREE OF CHARGE, AND THERE IS
   NO WARRANTY FOR THE PROGRAM. THERE ARE NO RESTRICTIONS ON THE USE OF THIS
   FREE SOURCE CODE. HIGHPOINT DOES NOT PROVIDE ANY TECHNICAL SUPPORT IF THE
   CODE HAS BEEN CHANGED FROM ORIGINAL SOURCE CODE.

   LIMITATION OF LIABILITY

   IN NO EVENT WILL HIGHPOINT BE LIABLE FOR DIRECT, INDIRECT, SPECIAL,
   INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF OR
   INABILITY TO USE THIS PRODUCT OR DOCUMENTATION, EVEN IF ADVISED OF THE
   POSSIBILITY OF SUCH DAMAGES. IN PARTICULAR, HIGHPOINT SHALL NOT HAVE
   LIABILITY FOR ANY HARDWARE, SOFTWARE, OR DATA STORED USED WITH THE
   PRODUCT, INCLUDING THE COSTS OF REPAIRING, REPLACING, OR RECOVERING
   SUCH HARDWARE, OR DATA.


2. Rebuild the kernel with RR222x support
--------------------------------------------
[...]
****

r.