NAME
ahd —
Adaptec PCI/PCI-X Ultra320 SCSI host
adapter driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device pci
device scbus
device ahd
To compile in debugging code:
options AHD_DEBUG
options AHD_DEBUG_OPTS=<bitmask of options>
options AHD_REG_PRETTY_PRINT
To configure one or more controllers to assume the target role:
options AHD_TMODE_ENABLE=<bitmask of units>
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
ahd_load="YES"
DESCRIPTION
This driver provides access to the SCSI bus(es) 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, 512 SCB's, and target mode.
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.
Individual controllers may be configured to operate in the target
role through the AHD_TMODE_ENABLE configuration
option. The value assigned to this option should be a bitmap of all units
where target mode is desired. For example, a value of 0x25 would enable
target mode on units 0, 2, and 5. Note that target mode is only supported
for ultra160 speeds and below.
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 adapter's SCSI ID.
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
HISTORY
The ahd driver first appeared in
FreeBSD 4.7.
AUTHORS
The ahd driver, the AIC7xxx sequencer-code
assembler, and the firmware running on the aic79xx chips was written by
Justin T. Gibbs. This manual page is based on the
ahc(4) manual page.
BUGS
The current generation of 79xx chips do not support target mode in Ultra320 mode. Target mode in general has not been well tested in this driver.