Promise PDC20319 4 ports SATA and the RAID1

Hello,
I just install FreeBSD5.3 on Asus "PSCH-L" motherboard. There is a
onboard ship  Promise PDC20319 4 ports SATA and the RAID1 is setup in
the BIOS "FastBuild(tm) Utility2.01(c) 2002-2005 Promise".
 The kernel messages and the next commands:"atacontrol list" and
"atacontrol status ar0" point out all things are fine, except this line
in the file /var/log/messages : "kernel: atapci0: failed: rid 0x20 is
memory, requested 4".
FreeBSD5.3 seems normally to work although I don't know how to make sure
the RAID1 works fine.
Here are commands issues and some lines of /var/log/messages:
login# atacontrol list
ATA channel 0:
    Master: acd0 <SAMSUNG CD-ROM SH-152A/C503> ATA/ATAPI revision 4
    Slave:       no device present
ATA channel 1:
    Master:      no device present
    Slave:       no device present
ATA channel 2:
    Master:      no device present
    Slave:       no device present
ATA channel 3:
    Master:  ad6 <Maxtor 6Y160M0/YAR51HW0>     Slave:       no device
present
ATA channel 4:
    Master:      no device present
    Slave:       no device present
ATA channel 5:
    Master: ad10 <Maxtor 6Y160M0/YAR51HW0>     Slave:       no device
present
login# atacontrol status ar0
ar0: ATA RAID1 subdisks: ad6 ad10 status: READY
login#

/var/log/messages:
kernel: atapci0: <Promise PDC20319 SATA150 controller> port
0xb400-0xb47f,0xb800-0xb80f,0xbc00-0xbc3f mem
0xfc960000-0xfc97ffff,0xfc99f000-0xfc99ffff irq 27 at device 5.0 on pci2
kernel: atapci0: failed: rid 0x20 is memory, requested 4
kernel: ata2: channel #0 on atapci0
kernel: ata3: channel #1 on atapci0
kernel: ata4: channel #2 on atapci0
kernel: ata5: channel #3 on atapci0

What means this kernel message :"atapci0: failed: rid 0x20 is memory,
requested 4" and how to make sure the RAID1 works fine?
Thank in anticipation,
claude
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Clé publique: http://pgp.mit.edu