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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/cdrom/sonycd535 | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'Documentation/cdrom/sonycd535')
-rw-r--r-- | Documentation/cdrom/sonycd535 | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/Documentation/cdrom/sonycd535 b/Documentation/cdrom/sonycd535 new file mode 100644 index 000000000000..59581a4b302a --- /dev/null +++ b/Documentation/cdrom/sonycd535 @@ -0,0 +1,121 @@ + 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. + +(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. |