ahd(4)

NAME

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

SYNOPSIS

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>
      options AHD_REG_PRETTY_PRINT
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

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, packe

tized transfers, tagged queueing, 512 SCB's, and target mode.

The AHD_DEBUG_OPTS option is used to control which diagnos

tic messages
are printed to the console when AHD_DEBUG is enabled. Logi

cally 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 hu

man-readable
bit definitions for each register that is printed by the de

bugging 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 val

ue 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 syn

chronous/asynchronous
transfers, maximum synchronous negotiation rate, wide trans

fers, disconnection, and the host adapter's SCSI ID.

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), 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.

BSD July 4, 2004

BSD