1 .. SPDX-License-Identifier: GPL-2.0
2
3 ==================
4 dc395x SCSI driver
5 ==================
6
7 Status
8 ------
9 The driver has been tested with CD-R and CD-R/W drives. These should
10 be safe to use. Testing with hard disks has not been done to any
11 great degree and caution should be exercised if you want to attempt
12 to use this driver with hard disks.
13
14 This driver is evolved from `the original 2.4 driver
15 <https://web.archive.org/web/20140129181343/http://www.garloff.de/kurt/linux/dc395/>`_.
16 Problems, questions and patches should be submitted to the `Linux SCSI
17 mailing list <linux-scsi@vger.kernel.org>`_.
18
19 Parameters
20 ----------
21 The driver uses the settings from the EEPROM set in the SCSI BIOS
22 setup. If there is no EEPROM, the driver uses default values.
23 Both can be overridden by command line parameters (module or kernel
24 parameters).
25
26 The following parameters are available:
27
28 safe
29 Default: 0, Acceptable values: 0 or 1
30
31 If safe is set to 1 then the adapter will use conservative
32 ("safe") default settings. This sets:
33
34 shortcut for dc395x=7,4,9,15,2,10
35
36 adapter_id
37 Default: 7, Acceptable values: 0 to 15
38
39 Sets the host adapter SCSI ID.
40
41 max_speed
42 Default: 1, Acceptable value: 0 to 7
43
44 == ========
45 0 20 Mhz
46 1 12.2 Mhz
47 2 10 Mhz
48 3 8 Mhz
49 4 6.7 Mhz
50 5 5.8 Hhz
51 6 5 Mhz
52 7 4 Mhz
53 == ========
54
55 dev_mode
56 Bitmap for device configuration
57
58 DevMode bit definition:
59
60 === ======== ======== =========================================
61 Bit Val(hex) Val(dec) Meaning
62 === ======== ======== =========================================
63 0 0x01 1 Parity check
64 1 0x02 2 Synchronous Negotiation
65 2 0x04 4 Disconnection
66 3 0x08 8 Send Start command on startup. (Not used)
67 4 0x10 16 Tagged Command Queueing
68 5 0x20 32 Wide Negotiation
69 === ======== ======== =========================================
70
71 adapter_mode
72 Bitmap for adapter configuration
73
74 AdaptMode bit definition
75
76 ===== ======== ======== ====================================================
77 Bit Val(hex) Val(dec) Meaning
78 ===== ======== ======== ====================================================
79 0 0x01 1 Support more than two drives. (Not used)
80 1 0x02 2 Use DOS compatible mapping for HDs greater than 1GB.
81 2 0x04 4 Reset SCSI Bus on startup.
82 3 0x08 8 Active Negation: Improves SCSI Bus noise immunity.
83 4 0x10 16 Immediate return on BIOS seek command. (Not used)
84 (*)5 0x20 32 Check for LUNs >= 1.
85 ===== ======== ======== ====================================================
86
87 tags
88 Default: 3, Acceptable values: 0-5
89
90 The number of tags is 1<<x, if x has been specified
91
92 reset_delay
93 Default: 1, Acceptable values: 0-180
94
95 The seconds to not accept commands after a SCSI Reset
96
97
98 For the built in driver the parameters should be prefixed with
99 dc395x. (eg "dc395x.safe=1")
100
101
102 Copyright
103 ---------
104 The driver is free software. It is protected by the GNU General Public
105 License (GPL). Please read it, before using this driver. It should be
106 included in your kernel sources and with your distribution. It carries the
107 filename COPYING. If you don't have it, please ask me to send you one by
108 email.
109
110 Note: The GNU GPL says also something about warranty and liability.
111 Please be aware the following: While we do my best to provide a working and
112 reliable driver, there is a chance, that it will kill your valuable data.
113 We refuse to take any responsibility for that. The driver is provided as-is
114 and YOU USE IT AT YOUR OWN RESPONSIBILITY.
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