I'm pretty sure I'm running this chip set under NetBSD-3.1 with no
problem.  The board I have has 6 SATA ports and they all work fine, though
I'm only using 4 at the moment.    I'm using the Asus M2ne main board.
Dmesg is listed below.  
The board works fine, speed is good, all devices are reliable, and it's
very stable now that I have working RAM in it.  Due to an existing problem
with NetBSD-3.1 and multiprocessor, it's running with the second CPU
disabled, but that is not a problem with the board at all.

Hope this helps.
-Brian

NetBSD 3.1_STABLE (RBL) #0: Sun Jun 24 09:39:33 PDT 2007
	buhrow@lothlorien.nfbcal.org:/usr/src/sys/arch/i386/compile/RBL
total memory = 2046 MB
avail memory = 1995 MB
BIOS32 rev. 0 found at 0xf1e10
SMBIOS rev. 2.4 @ 0xf0000 (72 entries)
PCI BIOS rev. 3.0 found at 0xf1e40
PCI IRQ Routing Table rev. 1.0 found at 0xfdb90, size 288 bytes (16 entries)
pcibios_pir_init: bad IRQ table checksum
pcibios_get_intr_routing: buffer too small
No PCI IRQ Routing information available.
mainbus0 (root)
cpu0 at mainbus0: (uniprocessor)
cpu0: AMD Unknown K7 (Athlon) (686-class), 2813.12 MHz, id 0x40f33
cpu0: features 178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features 178bfbff<PGE,MCA,CMOV,PAT,PSE36,MPC,MMX>
cpu0: features 178bfbff<FXSR,SSE,SSE2,B28>
cpu0: features2 2001<SSE3>
cpu0: "AMD Athlon(tm) 64 X2 Dual Core Processor 5600+"
acpi0 at mainbus0
acpi0: using Intel ACPI CA subsystem version 20040211
acpi0: X/RSDT: OemId <Nvidia,ASUSACPI,42302e31>, AslId <AWRD,00000000>
acpi0: SCI interrupting at int 9
acpi0: fixed-feature power button present
ACPI Object Type 'Processor' (0x0c) at acpi0 not configured
ACPI Object Type 'Processor' (0x0c) at acpi0 not configured
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpi_allocate_resources: res=14
acpi: activate failed for PNP0C0F
acpibut0 at acpi0 (PNP0C0C): ACPI Power Button
PNP0A08 at acpi0 not configured
PNP0C02 [Plug and Play motherboard register resources] at acpi0 not configured
PNP0C02 [Plug and Play motherboard register resources] at acpi0 not configured
PNP0000 [AT Interrupt Controller] at acpi0 not configured
PNP0200 [AT DMA Controller] at acpi0 not configured
PNP0100 [AT Timer] at acpi0 not configured
PNP0B00 [AT Real-Time Clock] at acpi0 not configured
PNP0800 [AT-style speaker sound] at acpi0 not configured
npx1 at acpi0 (PNP0C04)
npx1: io 0xf0-0xff irq 13
npx1: reported by CPUID; using exception 16
PNP0700 [PC standard floppy disk controller] at acpi0 not configured
PNP0501 [16550A-compatible COM port] at acpi0 not configured
PNP0400 [Standard LPT printer port] at acpi0 not configured
ATK0110 at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C02 [Plug and Play motherboard register resources] at acpi0 not configured
PNP0C01 [System Board] at acpi0 not configured
PNP0C0B [ACPI Fan] at acpi0 not configured
acpitz0 at acpi0: ACPI Thermal Zone
acpitz0: unable to get polling interval; using default of 30.0s
acpitz0: active cooling level 0: 73.0C
acpitz0: critical 75.0C passive 40.0C
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
NVIDIA product 0x0369 (RAM memory, revision 0xa1) at pci0 dev 0 function 0 not configured
pcib0 at pci0 dev 1 function 0
pcib0: NVIDIA product 0x0360 (rev. 0xa2)
NVIDIA MCP55 SMBus (SMBus serial bus, revision 0xa2) at pci0 dev 1 function 1 not configured
NVIDIA product 0x036a (RAM memory, revision 0xa2) at pci0 dev 1 function 2 not configured
ohci0 at pci0 dev 2 function 0: NVIDIA product 0x036c (rev. 0xa1)
ohci0: interrupting at irq 10
ohci0: OHCI version 1.0, legacy support
usb0 at ohci0: USB revision 1.0
uhub0 at usb0
uhub0: NVIDIA OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 10 ports with 10 removable, self powered
ehci0 at pci0 dev 2 function 1: NVIDIA product 0x036d (rev. 0xa2)
ehci0: interrupting at irq 11
ehci0: BIOS has given up ownership
ehci0: EHCI version 1.0
ehci0: companion controller, 10 ports each: ohci0
usb1 at ehci0: USB revision 2.0
uhub1 at usb1
uhub1: NVIDIA EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub1: single transaction translator
uhub1: 10 ports with 10 removable, self powered
viaide0 at pci0 dev 4 function 0
viaide0: NVIDIA MCP55 IDE Controller (rev. 0xa1)
viaide0: bus-master DMA support present
viaide0: primary channel configured to compatibility mode
viaide0: primary channel interrupting at irq 14
atabus0 at viaide0 channel 0
viaide0: secondary channel configured to compatibility mode
viaide0: secondary channel ignored (disabled)
viaide1 at pci0 dev 5 function 0
viaide1: NVIDIA MCP55 SATA Controller (rev. 0xa2)
viaide1: bus-master DMA support present
viaide1: primary channel wired to native-PCI mode
viaide1: using irq 5 for native-PCI interrupt
atabus1 at viaide1 channel 0
viaide1: secondary channel wired to native-PCI mode
atabus2 at viaide1 channel 1
viaide2 at pci0 dev 5 function 1
viaide2: NVIDIA MCP55 SATA Controller (rev. 0xa2)
viaide2: bus-master DMA support present
viaide2: primary channel wired to native-PCI mode
viaide2: using irq 10 for native-PCI interrupt
atabus3 at viaide2 channel 0
viaide2: secondary channel wired to native-PCI mode
atabus4 at viaide2 channel 1
viaide3 at pci0 dev 5 function 2
viaide3: NVIDIA MCP55 SATA Controller (rev. 0xa2)
viaide3: bus-master DMA support present
viaide3: primary channel wired to native-PCI mode
viaide3: using irq 11 for native-PCI interrupt
atabus5 at viaide3 channel 0
viaide3: secondary channel wired to native-PCI mode
atabus6 at viaide3 channel 1
ppb0 at pci0 dev 6 function 0: NVIDIA product 0x0370 (rev. 0xa2)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled
azalia0 at pci0 dev 6 function 1: Generic High Definition Audio Controller
azalia0: interrupting at irq 10
azalia0: host: NVIDIA HD Audio (rev. 162)
azalia0: host: High Definition Audio rev. 1.0
nfe0 at pci0 dev 8 function 0: irq 10, address 00:1b:fc:25:11:b0
ukphy0 at nfe0 phy 1: Generic IEEE 802.3u media interface
ukphy0: OUI 0x000ac2, model 0x0021, rev. 1
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
ppb1 at pci0 dev 10 function 0: NVIDIA product 0x0376 (rev. 0xa2)
pci2 at ppb1 bus 2
pci2: no spaces enabled!
ppb2 at pci0 dev 11 function 0: NVIDIA product 0x0374 (rev. 0xa2)
pci3 at ppb2 bus 3
pci3: no spaces enabled!
ppb3 at pci0 dev 12 function 0: NVIDIA product 0x0374 (rev. 0xa2)
pci4 at ppb3 bus 4
pci4: no spaces enabled!
ppb4 at pci0 dev 13 function 0: NVIDIA product 0x0378 (rev. 0xa2)
pci5 at ppb4 bus 5
pci5: no spaces enabled!
ppb5 at pci0 dev 14 function 0: NVIDIA product 0x0375 (rev. 0xa2)
pci6 at ppb5 bus 6
pci6: no spaces enabled!
ppb6 at pci0 dev 15 function 0: NVIDIA product 0x0377 (rev. 0xa2)
pci7 at ppb6 bus 7
pci7: i/o space, memory space enabled, rd/line, wr/inv ok
vga1 at pci7 dev 0 function 0: ATI Technologies Radeon X300 Series (rev. 0x00)
wsdisplay0 at vga1 kbdmux 1
wsmux1: connecting to wsdisplay0
ATI Technologies Radeon X300 Series Secondary (miscellaneous display) at pci7 dev 0 function 1 not configured
pchb0 at pci0 dev 24 function 0
pchb0: Advanced Micro Devices AMD64 HyperTransport configuration (rev. 0x00)
pchb1 at pci0 dev 24 function 1
pchb1: Advanced Micro Devices AMD64 Address Map configuration (rev. 0x00)
pchb2 at pci0 dev 24 function 2
pchb2: Advanced Micro Devices AMD64 DRAM configuration (rev. 0x00)
pchb3 at pci0 dev 24 function 3
pchb3: Advanced Micro Devices AMD64 Miscellaneous configuration (rev. 0x00)
isa0 at pcib0
lpt0 at isa0 port 0x378-0x37b irq 7
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com0: console
pckbc0 at isa0 port 0x60-0x64
pcppi0 at isa0 port 0x61
midi0 at pcppi0: PC speaker
spkr0 at pcppi0
sysbeep0 at pcppi0
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
isapnp0: no ISA Plug 'n Play devices found
azalia0: codec[0]: Analog Devices AD1988B (rev. 3.0)
azalia0: codec[0]: High Definition Audio rev. 1.0
azalia0: playback: max channels=8, encodings=1<PCM>
azalia0: playback: PCM formats=e07ff<24bit,20bit,16bit,192kHz,176.4kHz,96kHz,88.2kHz,48kHz,44.1kHz,32kHz,22.05kHz,16kHz,11.025kHz,8kHz>
azalia0: recording: max channels=4, encodings=1<PCM>
azalia0: recording: PCM formats=e07ff<24bit,20bit,16bit,192kHz,176.4kHz,96kHz,88.2kHz,48kHz,44.1kHz,32kHz,22.05kHz,16kHz,11.025kHz,8kHz>
audio0 at azalia0: full duplex, independent
Kernelized RAIDframe activated
atapibus0 at atabus0: 2 targets
cd0 at atapibus0 drive 0: <SONY    CD-RW  CRX140E, , 1.0n> cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
cd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
wd0 at atabus1 drive 0: <ST3750640AS>
wd0: drive supports 16-sector PIO transfers, LBA48 addressing
wd0: 698 GB, 1453521 cyl, 16 head, 63 sec, 512 bytes/sect x 1465149168 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd0(viaide1:0:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)
wd1 at atabus2 drive 0: <ST3750640AS>
wd1: drive supports 16-sector PIO transfers, LBA48 addressing
wd1: 698 GB, 1453521 cyl, 16 head, 63 sec, 512 bytes/sect x 1465149168 sectors
wd1: 32-bit data port
wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd1(viaide1:1:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)
wd2 at atabus3 drive 0: <ST3750640AS>
wd2: drive supports 16-sector PIO transfers, LBA48 addressing
wd2: 698 GB, 1453521 cyl, 16 head, 63 sec, 512 bytes/sect x 1465149168 sectors
wd2: 32-bit data port
wd2: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd2(viaide2:0:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)
wd3 at atabus4 drive 0: <ST3750640AS>
wd3: drive supports 16-sector PIO transfers, LBA48 addressing
wd3: 698 GB, 1453521 cyl, 16 head, 63 sec, 512 bytes/sect x 1465149168 sectors
wd3: 32-bit data port
wd3: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd3(viaide2:1:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)
raid0: RAID Level 5
raid0: Components: /dev/wd0e /dev/wd1e /dev/wd2e /dev/wd3e
raid0: Total Sectors: 2191675392 (1070154 MB)
raid1: RAID Level 5
raid1: Components: /dev/wd0f /dev/wd1f /dev/wd2f /dev/wd3f
raid1: Total Sectors: 2191675392 (1070154 MB)
boot device: raid0
root on raid0a dumps on raid0b
root file system type: ffs
raid0: Device already configured!
raid1: Device already configured!
Accounting started