how to enable NCQ on Intel ESB2 AHCI SATA controller/ST31000340NS

[Anton Yuzhaninov]

How to enable NCQ on this controller:
ahci0 at pci0:0:31:2:      class=0x010601 card=0x808015d9 chip=0x26818086
rev=0x09 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'LSI LOGIC, 62089A2, LSISAS1068 B0, T 0620, WE 119200.1
(62089A2)'
    class      = mass storage
    subclass   = SATA
    bar   [10] = type I/O Port, range 32, base 0x18a0, size  8, enabled
    bar   [14] = type I/O Port, range 32, base 0x1874, size  4, enabled
    bar   [18] = type I/O Port, range 32, base 0x1878, size  8, enabled
    bar   [1c] = type I/O Port, range 32, base 0x1870, size  4, enabled
    bar   [20] = type I/O Port, range 32, base 0x1880, size 32, enabled
    bar   [24] = type Memory, range 32, base 0xd8700400, size 1024,
enabled
    cap 01[70] = powerspec 2  supports D0 D3  current D0
    cap 12[a8] = SATA Index-Data Pair

dmesg:
ahci0: <Intel ESB2 AHCI SATA controller> port
0x18a0-0x18a7,0x1874-0x1877,0x1878-0x187f,0x1870-0x1873,0x1880-0x189f
mem 0xd8700400-0xd87007ff irq 19 at device 31.2 on pci0
ahci0: [ITHREAD]
ahci0: AHCI v1.10 with 6 3Gbps ports, Port Multiplier supported
...
ada0 at ahcich0 bus 0 scbus0 target 0 lun 0
ada0: <ST31000340NS SN05> ATA-8acd0: DVDROM <DVD-ROM UJDA780/1.50> at
ata0-slave UDMA33
ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada0: 953869MB (1953525168 512 byte sectors: 16H 63S/T 16383C)
ada1 at ahcich1 bus 0 scbus1 target 0 lun 0
ada1: <ST31000340NS SN05> ATA-8 SATA 2.x device
ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada1: 953869MB (1953525168 512 byte sectors: 16H 63S/T 16383C)
....

There is no lines "Command Queueing enabled"

# camcontrol tags ada0
(pass0:ahcich0:0:0:0): device openings: 2
camcontrol identify ada0
pass0: <ST31000340NS SN05> ATA-8 SATA 2.x device
pass0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)

protocol              ATA/ATAPI-8 SATA 2.x
device model          ST31000340NS
firmware revision     SN05
serial number         9QJ1L67B
WWN                   5000c500d902ea3
cylinders             16383
heads                 16
sectors/track         63
sector size           logical 512, physical 512, offset 0
LBA supported         268435455 sectors
LBA48 supported       1953525168 sectors
PIO supported         PIO4
DMA supported         WDMA2 UDMA6
media RPM             7200

Feature                      Support  Enabled   Value           Vendor
read ahead                     yes      yes
write cache                    yes      yes
flush cache                    yes      yes
overlap                        no
Tagged Command Queuing (TCQ)   no       no
Native Command Queuing (NCQ)   yes              32 tags
....

# uname -srp
FreeBSD 8.2-STABLE-20110315 amd64

-- 
WBR,
 Anton Yuzhaninov