AHD(4)							   BSD 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
     transfers, 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.

BSD
								   May 16, 2009 							       BSD