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jcastillo |
This is the README file for the Optics Storage 8000 AT CDROM device driver.
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This is the driver for the so-called 'DOLPHIN' drive, with the 34-pin
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Sony-compatible interface. For the IDE-compatible Optics Storage 8001
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drive, you will want the ATAPI CDROM driver. The driver also seems to
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work with the Lasermate CR328A. If you have a drive that works with
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this driver, and that doesn't report itself as DOLPHIN, please drop me
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a mail.
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The support for multisession CDs is in ALPHA stage. If you use it,
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please mail me your experiences. Multisession support can be disabled
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at compile time.
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You can find some older versions of the driver at
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dutette.et.tudelft.nl:/pub/linux/
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and at Eberhard's mirror
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ftp.gwdg.de:/pub/linux/cdrom/drivers/optics/
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Before you can use the driver, you have to create the device file once:
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# mknod /dev/optcd0 b 17 0
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To specify the base address if the driver is "compiled-in" to your kernel,
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you can use the kernel command line item (LILO option)
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optcd=0x340
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with the right address.
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If you have compiled optcd as a module, you can load it with
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# insmod /usr/src/linux/modules/optcd.o
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or
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# insmod /usr/src/linux/modules/optcd.o optcd=0x340
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with the matching address value of your interface card.
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The driver employs a number of buffers to do read-ahead and block size
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conversion. The number of buffers is configurable in optcd.h, and has
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influence on the driver performance. For my machine (a P75), 6 buffers
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seems optimal, as can be seen from this table:
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#bufs kb/s %cpu
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1 97 0.1
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2 191 0.3
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3 188 0.2
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4 246 0.3
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5 189 19
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6 280 0.4
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7 281 7.0
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8 246 2.8
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16 281 3.4
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If you get a throughput significantly below 300 kb/s, try tweaking
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N_BUFS, and don't forget to mail me your results!
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I'd appreciate success/failure reports. If you find a bug, try
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recompiling the driver with some strategically chosen debug options
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(these can be found in optcd.h) and include the messages generated in
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your bug report. Good luck.
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Leo Spiekman (spiekman@dutette.et.tudelft.nl)
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