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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	11.1		       September 1, 2002		  FreeBSD 11.1


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