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Date: Fri, 30 Apr 2010 19:59:50 -0700
From: Matthew Jacob <mj@feral.com>
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To: Pawel Tyll <ptyll@nitronet.pl>
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Cc: freebsd-scsi@freebsd.org
Subject: Re: LSI SAS1078 on Intel S5520UR board.
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Pawel Tyll wrote:
> Hello list,
>
> I'm having a problem with integrated LSI SAS1078 controller on S5520UR
> on FreeBSD 8.0-STABLE #1: Sat May  1 02:06:15 CEST 2010
>
> after kldload mpt:
>
> mpt0@pci0:13:0:0:       class=0x010000 card=0x35058086 chip=0x00621000 rev=0x04 hdr=0x00
>     vendor     = 'LSI Logic (Was: Symbios Logic, NCR)'
>     device     = 'PCI-Express Fusion-MPT SAS (LSISAS1078)'
>     class      = mass storage
>     subclass   = SCSI
>
> mpt0: <LSILogic SAS/SATA Adapter> port 0x1000-0x10ff mem 0xb1940000-0xb1943fff,0xb1900000-0xb193ffff irq 16 at device 0.0 on pci13
> mpt0: unable to map registers in PIO mode
>
> #

Some recovery mechanisms require both PIO as well as MMAP of registers. 
Guess your motheboard doesn't support that.