AHD(4)                  NetBSD Kernel Interfaces Manual                 AHD(4)

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

SYNOPSIS
     For one or more PCI/PCI-X cards:
     ahd* at pci? dev ? function ?

     To compile in debugging code:
           options AHD_DEBUG
           options AHD_DEBUG_OPTS=<bitmask of options>
           options AHD_REG_PRETTY_PRINT

     For SCSI busses:
     scsibus* at ahd?

DESCRIPTION
     This driver provides access to the SCSI bus(ses) 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, and 512 SCBs.

     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.

HARDWARE
     The ahd driver supports the following:

     o   Adaptec AIC7901 host adapter chip
     o   Adaptec AIC7901A host adapter chip
     o   Adaptec AIC7902 host adapter chip
     o   Adaptec 29320 host adapter
     o   Adaptec 39320 host adapter
     o   Many motherboards with on-board SCSI support

SEE ALSO
     ahc(4), cd(4), ch(4), intro(4), scsi(4) sd(4), ses(4), st(4)

HISTORY
     The ahd driver first appeared in FreeBSD 4.7 and NetBSD 2.0.

AUTHORS
     The ahd driver, the AIC7xxx sequencer-code assembler, and the firmware
     running on the aic79xx chips was written by Justin T. Gibbs.  NetBSD
     porting is done by Pascal Renauld, Frank van der Linden, Jason Thorpe,
     and Allen Briggs.  This manual page is based on the ahc(4) manual page.

NetBSD 5.0_STABLE                July 4, 2004                NetBSD 5.0_STABLE
