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AHD(4)			 BSD 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 messages
     are printed to the	console	when "AHD_DEBUG" is enabled.  Logically	'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-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 de-
     sired.  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	Ul-
     tra320 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.

BSD			       September 1, 2002			   BSD


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