AHD(4) MidnightBSD 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:

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, packetized transfers, 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 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.

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 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 synchronous/asynchronous transfers, maximum synchronous negotiation rate, wide transfers, disconnection, and the host adapter’s SCSI ID.

HARDWARE

The ahd driver supports the following:

Adaptec AIC7901 host adapter chip

Adaptec AIC7901A host adapter chip

Adaptec AIC7902 host adapter chip

Adaptec 29320 host adapter

Adaptec 39320 host adapter

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.

MidnightBSD 0.3 July 4, 2004 MidnightBSD 0.3