Manual Pages  — AHD

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.