2 .\" Copyright (c) 1998, 2000
3 .\" Justin T. Gibbs. All rights reserved.
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24 .\" $FreeBSD: src/share/man/man4/adw.4,v 1.5.4.6 2001/10/01 13:07:22 dd Exp $
25 .\" $DragonFly: src/share/man/man4/adw.4,v 1.5 2007/09/30 06:10:43 swildner Exp $
27 .Dd September 29, 2007
32 .Nd Advansys PCI 16bit SCSI Host adapter driver
37 For one or more SCSI busses:
38 .Cd device scbus0 at adw0
40 To allow PCI adapters to use memory mapped I/O if enabled:
41 .Cd options ADW_ALLOW_MEMIO
43 This driver provides access to the 16bit
45 bus connected to the Advanced Systems Products, Inc.
48 .Tn ASC38C0800 Ultra2 ,
49 SCSI Host Adapter chips.
50 AdvanSys products incorporating these chips include the
57 Both chips support, synchronous transfers
58 (20MHz and 40MHz max respectively),
59 16bit transfers, tagged queueing,
60 and up to 253 concurrent SCSI transactions.
62 Per target configuration performed in the
64 menu, which is accessible at boot,
65 is honored by this driver.
66 This includes synchronous/asynchronous transfers,
67 maximum synchronous negotiation rate, wide transfers, disconnection,
68 tagged queueing, and the host adapter's SCSI ID.
69 The global setting for the maximum number of tagged transactions allowed
70 per target is not honored as the CAM SCSI system will automatically determine
71 the maximum number of tags a device can receive as well as guarantee fair
72 resource allocation among devices.
74 Memory mapped I/O can be enabled with the
75 .Dq Dv ADW_ALLOW_MEMIO
77 Memory mapped I/O is more efficient than the alternative, programmed I/O.
78 Most PCI BIOSes will map devices so that either technique for communicating
79 with the card is available.
97 from the Linux driver written by
99 of Advanced System Products, Inc.
100 Many thanks to AdvanSys for providing the original driver
101 under a suitable license for use in