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.