NAME

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

SYNOPSIS

For one or more PCI/PCI-X cards:
ahd* at pci? dev ? function ?

To compile in debugging code:

For SCSI busses:
scsibus* at ahd?

DESCRIPTION

This driver provides access to the SCSI bus(ses) 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, and 512 SCBs.

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.

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), ch(4), intro(4), scsi(4), sd(4), ses(4), st(4)

HISTORY

The ahd driver first appeared in FreeBSD 4.7 and NetBSD 2.0.

AUTHORS

The ahd driver, the AIC7xxx sequencer-code assembler, and the firmware running on the aic79xx chips was written by Justin T. Gibbs. NetBSD porting is done by Pascal Renauld, Frank van der Linden, Jason Thorpe, and Allen Briggs. This manual page is based on the ahc(4) manual page.