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AHD(4)                 FreeBSD Kernel Interfaces Manual                 AHD(4)

     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>

     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
     AIC7901 and AIC7902 host adapter chips.  These chips are found on many
     motherboards as well as the 29320 and 39320 Adaptec SCSI controller

     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 mes-
     sages are printed to the console when ``AHD_DEBUG'' is enabled.  Logi-
     cally 'or' the following bits together:

           Value   Function
           0x0001  Show miscellanious 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-read-
     able bit definitions for each register that is printed by the debugging
     code.  However, it also bloats the compiled size of the driver by approx-
     imately 215KB.

     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 supoprted for ultra160
     speeds and below.

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

     ahc(4), cd(4), da(4), sa(4), scsi(4)

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

     The ahd driver first appeared in FreeBSD 4.7.

FreeBSD 4.10                   September 1, 2002                  FreeBSD 4.10


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