720a845911
Remove (or edit) remaining references to the now dead verify_area() function from files in Documentation/. Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
122 lines
5.2 KiB
Text
122 lines
5.2 KiB
Text
README FOR LINUX SONY CDU-535/531 DRIVER
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========================================
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This is the Sony CDU-535 (and 531) driver version 0.7 for Linux.
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I do not think I have the documentation to add features like DMA support
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so if anyone else wants to pursue it or help me with it, please do.
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(I need to see what was done for the CDU-31A driver -- perhaps I can
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steal some of that code.)
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This is a Linux device driver for the Sony CDU-535 CDROM drive. This is
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one of the older Sony drives with its own interface card (Sony bus).
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The DOS driver for this drive is named SONY_CDU.SYS - when you boot DOS
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your drive should be identified as a SONY CDU-535. The driver works
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with a CDU-531 also. One user reported that the driver worked on drives
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OEM'ed by Procomm, drive and interface board were labelled Procomm.
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The Linux driver is based on Corey Minyard's sonycd 0.3 driver for
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the CDU-31A. Ron Jeppesen just changed the commands that were sent
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to the drive to correspond to the CDU-535 commands and registers.
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There were enough changes to let bugs creep in but it seems to be stable.
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Ron was able to tar an entire CDROM (should read all blocks) and built
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ghostview and xfig off Walnut Creek's X11R5/GNU CDROM. xcdplayer and
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workman work with the driver. Others have used the driver without
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problems except those dealing with wait loops (fixed in third release).
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Like Minyard's original driver this one uses a polled interface (this
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is also the default setup for the DOS driver). It has not been tried
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with interrupts or DMA enabled on the board.
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REQUIREMENTS
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============
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- Sony CDU-535 drive, preferably without interrupts and DMA
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enabled on the card.
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- Drive must be set up as unit 1. Only the first unit will be
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recognized
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- You must enter your interface address into
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/usr/src/linux/drivers/cdrom/sonycd535.h and build the
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appropriate kernel or use the "kernel command line" parameter
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sonycd535=0x320
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with the correct interface address.
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NOTES:
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======
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1) The drive MUST be turned on when booting or it will not be recognized!
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(but see comments on modularized version below)
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2) when the cdrom device is opened the eject button is disabled to keep the
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user from ejecting a mounted disk and replacing it with another.
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Unfortunately xcdplayer and workman also open the cdrom device so you
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have to use the eject button in the software. Keep this in mind if your
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cdrom player refuses to give up its disk -- exit workman or xcdplayer, or
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umount the drive if it has been mounted.
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THANKS
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======
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Many thanks to Ron Jeppesen (ronj.an@site007.saic.com) for getting
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this project off the ground. He wrote the initial release
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and the first two patches to this driver (0.1, 0.2, and 0.3).
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Thanks also to Eberhard Moenkeberg (emoenke@gwdg.de) for prodding
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me to place this code into the mainstream Linux source tree
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(as of Linux version 1.1.91), as well as some patches to make
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it a better device citizen. Further thanks to Joel Katz
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<joelkatz@webchat.org> for his MODULE patches (see details below),
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Porfiri Claudio <C.Porfiri@nisms.tei.ericsson.se> for patches
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to make the driver work with the older CDU-510/515 series, and
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Heiko Eissfeldt <heiko@colossus.escape.de> for pointing out that
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the verify_area() checks were ignoring the results of said checks
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(note: verify_area() has since been replaced by access_ok()).
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(Acknowledgments from Ron Jeppesen in the 0.3 release:)
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Thanks to Corey Minyard who wrote the original CDU-31A driver on which
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this driver is based. Thanks to Ken Pizzini and Bob Blair who provided
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patches and feedback on the first release of this driver.
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Ken Pizzini
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ken@halcyon.com
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------------------------------------------------------------------------------
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(The following is from Joel Katz <joelkatz@webchat.org>.)
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To build a version of sony535.o that can be installed as a module,
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use the following command:
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gcc -c -D__KERNEL__ -DMODULE -O2 sonycd535.c -o sonycd535.o
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To install the module, simply type:
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insmod sony535.o
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or
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insmod sony535.o sonycd535=<address>
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And to remove it:
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rmmod sony535
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The code checks to see if MODULE is defined and behaves as it used
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to if MODULE is not defined. That means your patched file should behave
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exactly as it used to if compiled into the kernel.
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I have an external drive, and I usually leave it powered off. I used
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to have to reboot if I needed to use the CDROM drive. Now I don't.
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Even if you have an internal drive, why waste the 96K of memory
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(unswappable) that the driver uses if you use your CD-ROM drive infrequently?
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This driver will not install (whether compiled in or loaded as a
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module) if the CDROM drive is not available during its initialization. This
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means that you can have the driver compiled into the kernel and still load
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the module later (assuming the driver doesn't install itself during
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power-on). This only wastes 12K when you boot with the CDROM drive off.
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This is what I usually do; I leave the driver compiled into the
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kernel, but load it as a module if I powered the system up with the drive
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off and then later decided to use the CDROM drive.
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Since the driver only uses a single page to point to the chunks,
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attempting to set the buffer cache to more than 2 Megabytes would be very
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bad; don't do that.
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