1.. SPDX-License-Identifier: GPL-2.0 2 3================== 4dc395x SCSI driver 5================== 6 7Status 8------ 9The driver has been tested with CD-R and CD-R/W drives. These should 10be safe to use. Testing with hard disks has not been done to any 11great degree and caution should be exercised if you want to attempt 12to use this driver with hard disks. 13 14This driver is evolved from `the original 2.4 driver 15<https://web.archive.org/web/20140129181343/http://www.garloff.de/kurt/linux/dc395/>`_. 16Problems, questions and patches should be submitted to the `Linux SCSI 17mailing list <linux-scsi@vger.kernel.org>`_. 18 19Parameters 20---------- 21The driver uses the settings from the EEPROM set in the SCSI BIOS 22setup. If there is no EEPROM, the driver uses default values. 23Both can be overridden by command line parameters (module or kernel 24parameters). 25 26The following parameters are available: 27 28safe 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 36adapter_id 37 Default: 7, Acceptable values: 0 to 15 38 39 Sets the host adapter SCSI ID. 40 41max_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 55dev_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 71adapter_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 87tags 88 Default: 3, Acceptable values: 0-5 89 90 The number of tags is 1<<x, if x has been specified 91 92reset_delay 93 Default: 1, Acceptable values: 0-180 94 95 The seconds to not accept commands after a SCSI Reset 96 97 98For the built in driver the parameters should be prefixed with 99dc395x. (eg "dc395x.safe=1") 100 101 102Copyright 103--------- 104The driver is free software. It is protected by the GNU General Public 105License (GPL). Please read it, before using this driver. It should be 106included in your kernel sources and with your distribution. It carries the 107filename COPYING. If you don't have it, please ask me to send you one by 108email. 109 110Note: The GNU GPL says also something about warranty and liability. 111Please be aware the following: While we do my best to provide a working and 112reliable driver, there is a chance, that it will kill your valuable data. 113We refuse to take any responsibility for that. The driver is provided as-is 114and YOU USE IT AT YOUR OWN RESPONSIBILITY. 115