Documentation/scsi/dc395x.rst

Source file repositories/reference/linux-study-clean/Documentation/scsi/dc395x.rst

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Documentation/scsi/dc395x.rst
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Support Tooling And Documentation
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Documentation
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Support Tooling And Documentation: documentation
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Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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.. SPDX-License-Identifier: GPL-2.0

==================
dc395x SCSI driver
==================

Status
------
The driver has been tested with CD-R and CD-R/W drives. These should
be safe to use. Testing with hard disks has not been done to any
great degree and caution should be exercised if you want to attempt
to use this driver with hard disks.

This driver is evolved from `the original 2.4 driver
<https://web.archive.org/web/20140129181343/http://www.garloff.de/kurt/linux/dc395/>`_.
Problems, questions and patches should be submitted to the `Linux SCSI
mailing list <linux-scsi@vger.kernel.org>`_.

Parameters
----------
The driver uses the settings from the EEPROM set in the SCSI BIOS
setup. If there is no EEPROM, the driver uses default values.
Both can be overridden by command line parameters (module or kernel
parameters).

The following parameters are available:

safe
   Default: 0, Acceptable values: 0 or 1

   If safe is set to 1 then the adapter will use conservative
   ("safe") default settings. This sets:

		shortcut for dc395x=7,4,9,15,2,10

adapter_id
   Default: 7, Acceptable values: 0 to 15

   Sets the host adapter SCSI ID.

max_speed
   Default: 1, Acceptable value: 0 to 7

   ==  ========
   0   20   Mhz
   1   12.2 Mhz
   2   10   Mhz
   3   8    Mhz
   4   6.7  Mhz
   5   5.8  Hhz
   6   5    Mhz
   7   4    Mhz
   ==  ========

dev_mode
   Bitmap for device configuration

   DevMode bit definition:

      === ======== ========  =========================================
      Bit Val(hex) Val(dec)  Meaning
      === ======== ========  =========================================
       0    0x01       1     Parity check
       1    0x02       2     Synchronous Negotiation
       2    0x04       4     Disconnection
       3    0x08       8     Send Start command on startup. (Not used)
       4    0x10      16     Tagged Command Queueing
       5    0x20      32     Wide Negotiation
      === ======== ========  =========================================

Annotation

Implementation Notes