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xianfeng |
README file for the dc395x SCSI driver
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==========================================
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Status
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------
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The driver has been tested with CD-R and CD-R/W drives. These should
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be safe to use. Testing with hard disks has not been done to any
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great degree and caution should be exercised if you want to attempt
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to use this driver with hard disks.
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This is a 2.5 only driver. For a 2.4 driver please see the original
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driver (which this driver started from) at
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http://www.garloff.de/kurt/linux/dc395/
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Problems, questions and patches should be submitted to the mailing
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list. Details on the list, including archives, are available at
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http://lists.twibble.org/mailman/listinfo/dc395x/
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Parameters
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----------
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The driver uses the settings from the EEPROM set in the SCSI BIOS
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setup. If there is no EEPROM, the driver uses default values.
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Both can be overridden by command line parameters (module or kernel
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parameters).
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The following parameters are available:
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- safe
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Default: 0, Acceptable values: 0 or 1
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If safe is set to 1 then the adapter will use conservative
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("safe") default settings. This sets:
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shortcut for dc395x=7,4,9,15,2,10
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- adapter_id
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Default: 7, Acceptable values: 0 to 15
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Sets the host adapter SCSI ID.
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- max_speed
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Default: 1, Acceptable value: 0 to 7
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1 = 12.2 Mhz
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2 = 10 Mhz
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3 = 8 Mhz
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4 = 6.7 Mhz
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5 = 5.8 Hhz
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6 = 5 Mhz
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7 = 4 Mhz
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- dev_mode
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Bitmap for device configuration
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DevMode bit definition:
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Bit Val(hex) Val(dec) Meaning
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*0 0x01 1 Parity check
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*1 0x02 2 Synchronous Negotiation
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*2 0x04 4 Disconnection
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*3 0x08 8 Send Start command on startup. (Not used)
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*4 0x10 16 Tagged Command Queueing
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*5 0x20 32 Wide Negotiation
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- adapter_mode
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Bitmap for adapter configuration
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AdaptMode bit definition
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Bit Val(hex) Val(dec) Meaning
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*0 0x01 1 Support more than two drives. (Not used)
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*1 0x02 2 Use DOS compatible mapping for HDs greater than 1GB.
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*2 0x04 4 Reset SCSI Bus on startup.
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*3 0x08 8 Active Negation: Improves SCSI Bus noise immunity.
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4 0x10 16 Immediate return on BIOS seek command. (Not used)
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(*)5 0x20 32 Check for LUNs >= 1.
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- tags
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Default: 3, Acceptable values: 0-5
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The number of tags is 1<
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- reset_delay
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Default: 1, Acceptable values: 0-180
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The seconds to not accept commands after a SCSI Reset
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For the built in driver the parameters should be prefixed with
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dc395x. (eg "dc395x.safe=1")
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Copyright
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---------
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The driver is free software. It is protected by the GNU General Public
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License (GPL). Please read it, before using this driver. It should be
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included in your kernel sources and with your distribution. It carries the
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filename COPYING. If you don't have it, please ask me to send you one by
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email.
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Note: The GNU GPL says also something about warranty and liability.
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Please be aware the following: While we do my best to provide a working and
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reliable driver, there is a chance, that it will kill your valuable data.
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We refuse to take any responsibility for that. The driver is provided as-is
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and YOU USE IT AT YOUR OWN RESPONSIBILITY.
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