NAME

ahd —

Adaptec PCI/PCI-X Ultra320 SCSI host adapter driver

SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file:

device pci
device scbus
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>

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

ahd_load="YES"

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

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.