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      ahd - Adaptec PCI/PCI-X Ultra320 SCSI host adapter driver


      For one or more PCI/PCI-X cards:
            device pci
            device ahd
      To compile in debugging code:
            options AHD_DEBUG
            options AHD_DEBUG_OPTS=<bitmask of options>
            options AHD_REG_PRETTY_PRINT
      To configure one or more controllers to assume the target role:
            options AHD_TMODE_ENABLE=<bitmask of units>
      For one or more SCSI busses:
            device scbus


      This driver provides access to the SCSI bus(es) connected to Adaptec
      AIC79xx host adapter chips.
      Driver features include support for narrow and wide busses, fast, ultra,
      ultra2, ultra160, and ultra320 synchronous transfers, packetized trans‐
      fers, tagged queueing, 512 SCB’s, and target mode.
      The AHD_DEBUG_OPTS option is used to control which diagnostic messages
      are printed to the console when AHD_DEBUG is enabled.  Logically OR the
      following bits together:
            Value    Function
            0x0001   Show miscellaneous information
            0x0002   Show sense data
            0x0004   Show Serial EEPROM contents
            0x0008   Show bus termination settings
            0x0010   Show host memory usage
            0x0020   Show SCSI protocol messages
            0x0040   Show mode pointer of the chip register window
            0x0080   Show selection timeouts
            0x0100   Show FIFO usage messages
            0x0200   Show Queue Full status
            0x0400   Show SCB queue status
            0x0800   Show inbound packet information
            0x1000   Show S/G list information
            0x2000   Enable extra diagnostic code in the firmware
      The AHD_REG_PRETTY_PRINT option compiles in support for human-readable
      bit definitions for each register that is printed by the debugging code.
      However, it also bloats the compiled size of the driver by approximately
      Individual controllers may be configured to operate in the target role
      through the AHD_TMODE_ENABLE configuration option.  The value assigned to
      this option should be a bitmap of all units where target mode is desired.
      For example, a value of 0x25 would enable target mode on units 0, 2, and
      5.  Note that target mode is only supported for ultra160 speeds and
      Per target configuration performed in the SCSI-Select menu, accessible at
      boot, is honored by this driver.  This includes synchronous/asynchronous
      transfers, maximum synchronous negotiation rate, wide transfers, discon‐
      nection, and the host adapter’s SCSI ID.


      The ahd driver supports the following:
            Adaptec AIC7901 host adapter chip
            Adaptec AIC7901A host adapter chip
            Adaptec AIC7902 host adapter chip
            Adaptec 29320 host adapter
            Adaptec 39320 host adapter
            Many motherboards with on-board SCSI support


      The ahd driver first appeared in FreeBSD 4.7.


      The ahd driver, the AIC7xxx sequencer-code assembler, and the firmware
      running on the aic79xx chips was written by Justin T. Gibbs.  This manual
ahc(4) manual page.


      The current generation of 79xx chips do not support target mode in
      Ultra320 mode.  Target mode in general has not been well tested in this


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