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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!
58 lines
2.0 KiB
Plaintext
58 lines
2.0 KiB
Plaintext
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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