ahd —
Adaptec PCI/PCI-X AIC79xx-based Ultra320 SCSI interface
SYNOPSIS
.Cd "ahd* at pci?"
.Cd "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:
.Cd option AHD_DEBUG
.Cd option AHD_DEBUG_OPTS=
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
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.
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.