Adaptec AHD U320 operating as only U160

Justin T. Gibbs gibbs at
Sun Feb 17 07:06:10 UTC 2008

Niki Denev wrote:
 > I was playing around with DTrace, tracing cam/xpt and the ahd driver and
 > found out that if i comment the following code :
 >         if ((spi3caps & SID_SPI_IUS) == 0)
 >                 spi->ppr_options &= ~MSG_EXT_PPR_IU_REQ;
 > at line 6655 in sys/cam/cam_xpt.c my disks again negotiate as U320 :
 >   da0 at ahd0 bus 0 target 0 lun 0
 >   da0: <SEAGATE ST336807LW 0C01> Fixed Direct Access SCSI-3 device
 >   da0: 320.000MB/s transfers (160.000MHz DT, offset 63, 16bit)
 >   da0: Command Queueing Enabled
 >   da0: 35003MB (71687372 512 byte sectors: 255H 63S/T 4462C)

The aic79xx driver was not properly exporting its capabilities to
CAM.  This has been addressed as of version 1.30 of aic79xx_osm.c.
Please let me know if you still have problems.

 > Unfortunately I began seeing again the "Invalid sequencer interrupt"
 > messages that i was seeing before(with fbsd 6.2) with Seagate drives
 > on Adaptec at U320 speeds, and I prey that they are harmless (as they
 > used to be?)

While I do not know their root cause, they do appear to be harmless.
Do you happen to have your drives in a SES enclosure (on a backplane
with a SES chip)?  One user claimed this was only reproducible when
a GEM318 SES chip was on the bus.


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