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-              README FOR LINUX SONY CDU-535/531 DRIVER
-              ========================================
-
-This is the Sony CDU-535 (and 531) driver version 0.7 for Linux.
-I do not think I have the documentation to add features like DMA support
-so if anyone else wants to pursue it or help me with it, please do.
-(I need to see what was done for the CDU-31A driver -- perhaps I can
-steal some of that code.)
-
-This is a Linux device driver for the Sony CDU-535 CDROM drive.  This is
-one of the older Sony drives with its own interface card (Sony bus).
-The DOS driver for this drive is named SONY_CDU.SYS - when you boot DOS
-your drive should be identified as a SONY CDU-535.  The driver works
-with a CDU-531 also.  One user reported that the driver worked on drives
-OEM'ed by Procomm, drive and interface board were labelled Procomm.
-
-The Linux driver is based on Corey Minyard's sonycd 0.3 driver for
-the CDU-31A.  Ron Jeppesen just changed the commands that were sent
-to the drive to correspond to the CDU-535 commands and registers.
-There were enough changes to let bugs creep in but it seems to be stable.
-Ron was able to tar an entire CDROM (should read all blocks) and built
-ghostview and xfig off Walnut Creek's X11R5/GNU CDROM.  xcdplayer and
-workman work with the driver.  Others have used the driver without
-problems except those dealing with wait loops (fixed in third release).
-Like Minyard's original driver this one uses a polled interface (this
-is also the default setup for the DOS driver).  It has not been tried
-with interrupts or DMA enabled on the board.
-
-REQUIREMENTS
-============
-
-        - Sony CDU-535 drive, preferably without interrupts and DMA 
-          enabled on the card.
-
-        - Drive must be set up as unit 1.  Only the first unit will be 
-          recognized
-
-        - You must enter your interface address into 
-          /usr/src/linux/drivers/cdrom/sonycd535.h and build the
-          appropriate kernel or use the "kernel command line" parameter
-                sonycd535=0x320
-          with the correct interface address.
-
-NOTES:
-======
-
-1) The drive MUST be turned on when booting or it will not be recognized!
-   (but see comments on modularized version below)
-
-2) when the cdrom device is opened the eject button is disabled to keep the
-   user from ejecting a mounted disk and replacing it with another.
-   Unfortunately xcdplayer and workman also open the cdrom device so you
-   have to use the eject button in the software.  Keep this in mind if your
-   cdrom player refuses to give up its disk -- exit workman or xcdplayer, or
-   umount the drive if it has been mounted.
-
-THANKS
-======
-
-Many thanks to Ron Jeppesen (ronj.an@site007.saic.com) for getting
-this project off the ground.  He wrote the initial release
-and the first two patches to this driver (0.1, 0.2, and 0.3).
-Thanks also to Eberhard Moenkeberg (emoenke@gwdg.de) for prodding
-me to place this code into the mainstream Linux source tree
-(as of Linux version 1.1.91), as well as some patches to make
-it a better device citizen.  Further thanks to Joel Katz
-<joelkatz@webchat.org> for his MODULE patches (see details below),
-Porfiri Claudio <C.Porfiri@nisms.tei.ericsson.se> for patches
-to make the driver work with the older CDU-510/515 series, and
-Heiko Eissfeldt <heiko@colossus.escape.de> for pointing out that
-the verify_area() checks were ignoring the results of said checks
-(note: verify_area() has since been replaced by access_ok()).
-
-(Acknowledgments from Ron Jeppesen in the 0.3 release:)
-Thanks to Corey Minyard who wrote the original CDU-31A driver on which
-this driver is based.  Thanks to Ken Pizzini and Bob Blair who provided 
-patches and feedback on the first release of this driver.
-
-Ken Pizzini
-ken@halcyon.com
-
-------------------------------------------------------------------------------
-(The following is from Joel Katz <joelkatz@webchat.org>.)
-
-        To build a version of sony535.o that can be installed as a module,
-use the following command:
-
-gcc -c -D__KERNEL__ -DMODULE -O2 sonycd535.c -o sonycd535.o
-
-        To install the module, simply type:
-
-insmod sony535.o
-        or
-insmod sony535.o sonycd535=<address>
-
-        And to remove it:
-
-rmmod sony535
-
-        The code checks to see if MODULE is defined and behaves as it used
-to if MODULE is not defined. That means your patched file should behave
-exactly as it used to if compiled into the kernel.
-
-        I have an external drive, and I usually leave it powered off. I used
-to have to reboot if I needed to use the CDROM drive. Now I don't.
-
-        Even if you have an internal drive, why waste the 96K of memory
-(unswappable) that the driver uses if you use your CD-ROM drive infrequently?
-
-        This driver will not install (whether compiled in or loaded as a
-module) if the CDROM drive is not available during its initialization. This
-means that you can have the driver compiled into the kernel and still load
-the module later (assuming the driver doesn't install itself during
-power-on). This only wastes 12K when you boot with the CDROM drive off.
-
-        This is what I usually do; I leave the driver compiled into the
-kernel, but load it as a module if I powered the system up with the drive
-off and then later decided to use the CDROM drive.
-
-        Since the driver only uses a single page to point to the chunks,
-attempting to set the buffer cache to more than 2 Megabytes would be very
-bad; don't do that.