AHD(4)

NAME
ahd - Adaptec PCI/PCI-X AIC79xx-based Ultra320 SCSI interface

SYNOPSIS
ahd* at pci?
scsibus* at ahd?

DESCRIPTION
ahd provides access to the SCSI bus(es) connected to Adaptec AIC79xx host adapter chips.

ahd supports narrow and wide buses; synchronous and asynchronous operation; fast, ultra, ultra2, ultra160, and ultra320 (packetized) transfers; tagged queuing and 512 SCBs.

ahd does not support target mode operation.

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

To compile in debugging code:

option AHD_DEBUG option AHD_DEBUG_OPTS=<bitmask of options>

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

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 adapters SCSI ID.

SEE ALSO
ahc(4), cd(4), ch(4), intro(4), pci(4), scsi(4), sd(4), st(4), uk(4)

HISTORY
The ahd driver was ported from FreeBSD 4.7 and first appeared in OpenBSD 3.6.

AUTHORS
The ahd driver, the AIC7xxx sequencer-code assembler, and the firmware running on the aic79xx chips was written by Justin T. Gibbs.

OpenBSD port by Milos Urbanek, Kenneth R. Westerback & Marco Peereboom.