AHCI/ATA_CAM for dummies?

Doug Barton dougb at FreeBSD.org
Mon Dec 14 07:43:13 UTC 2009

b. f. wrote:
> Hmm.  From what little I know, your chipset should support AHCI, so
> perhaps your motherboard or bios isn't set up right?:
> p. 39, 44 of the pdf at:
> http://www.intel.com/design/chipsets/datashts/307013.htm

On page 44 it says, "for some features, hardware support in the SATA
device ..."

Full output of 'camcontrol identify':

pass0: <Hitachi HTS721010G9SA00 MCZOC10H> ATA-7 SATA 1.x device
pass0: 100.000MB/s transfers (UDMA5, PIO size 8192bytes)

protocol              ATA/ATAPI-7 SATA 1.x
device model          Hitachi HTS721010G9SA00
firmware revision     MCZOC10H
serial number         MPCZN7Y0GZSYAL
cylinders             16383
heads                 16
sectors/track         63
sector size           logical 512, physical 512, offset 0
LBA supported         195371568 sectors
LBA48 supported       195371568 sectors
PIO supported         PIO4
DMA supported         WDMA2 UDMA5
overlap not supported

Feature                      Support  Enable    Value           Vendor
read ahead                     yes	yes
write cache                    yes	yes
flush cache                    yes	yes
Native Command Queuing (NCQ)   yes		31/0x1F
Tagged Command Queuing (TCQ)   no	no	31/0x1F
SMART                          yes	yes
microcode download             yes	yes
security                       yes	no
power management               yes	yes
advanced power management      yes	yes	16512/0x4080
automatic acoustic management  yes	yes	254/0xFE	128/0x80
media status notification      no	no
power-up in Standby            yes	no
write-read-verify              no	no	0/0x0
unload                         no	no
free-fall                      no	no

Perhaps it does not have the requisite "hardware support" for ahci?


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