AHD(4) - Device Drivers Manual

AHD(4) - Device Drivers Manual #

AHD(4) - Device Drivers Manual

NAME #

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

SYNOPSIS #

ahd* at pci?

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.

OpenBSD 7.5 - August 14, 2012