NAME

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

SYNOPSIS

       To compile this driver into the kernel, place the following lines in your kernel configuration file:

             device pci
             device scbus
             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>

       Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

             ahd_load="YES"

DESCRIPTION

       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 transfers, 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 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 supported 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, disconnection, and the host adapter's SCSI ID.

HARDWARE

       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

SEE ALSO

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

HISTORY

       The ahd driver first appeared in FreeBSD 4.7.

AUTHORS

       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.

BUGS

       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 driver.

Debian                                            July 4, 2004                                            AHD(4)