101 lines
4.6 KiB
Text
101 lines
4.6 KiB
Text
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-- Documentation/cdrom/isp16
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Docs by Eric van der Maarel <H.T.M.v.d.Maarel@marin.nl>
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This is the README for version 0.6 of the cdrom interface on an
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ISP16, MAD16 or Mozart sound card.
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The detection and configuration of this interface used to be included
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in both the sjcd and optcd cdrom driver. Drives supported by these
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drivers came packed with Media Magic's multi media kit, which also
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included the ISP16 card. The idea (thanks Leo Spiekman)
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to move it from these drivers into a separate module and moreover, not to
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rely on the MAD16 sound driver, are as follows:
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-duplication of code in the kernel is a waste of resources and should
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be avoided;
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-however, kernels and notably those included with Linux distributions
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(cf Slackware 3.0 included version 0.5 of the isp16 configuration
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code included in the drivers) don't always come with sound support
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included. Especially when they already include a bunch of cdrom drivers.
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Hence, the cdrom interface should be configurable _independently_ of
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sound support.
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The ISP16, MAD16 and Mozart sound cards have an OPTi 82C928 or an
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OPTi 82C929 chip. The interface on these cards should work with
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any cdrom attached to the card, which is 'electrically' compatible
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with Sanyo/Panasonic, Sony or Mitsumi non-ide drives. However, the
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command sets for any proprietary drives may differ
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(and hence may not be supported in the kernel) from these four types.
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For a fact I know the interface works and the way of configuration
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as described in this documentation works in combination with the
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sjcd (in Sanyo/Panasonic compatibility mode) cdrom drivers
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(probably with the optcd (in Sony compatibility mode) as well).
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If you have such an OPTi based sound card and you want to use the
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cdrom interface with a cdrom drive supported by any of the other cdrom
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drivers, it will probably work. Please let me know any experience you
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might have).
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I understand that cards based on the OPTi 82C929 chips may be configured
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(hardware jumpers that is) as an IDE interface. Initialisation of such a
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card in this mode is not supported (yet?).
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The suggestion to configure the ISP16 etc. sound card by booting DOS and
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do a warm reboot to boot Linux somehow doesn't work, at least not
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on my machine (IPC P90), with the OPTi 82C928 based card.
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Booting the kernel through the boot manager LILO allows the use
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of some command line options on the 'LILO boot:' prompt. At boot time
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press Alt or Shift while the LILO prompt is written on the screen and enter
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any kernel options. Alternatively these options may be used in
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the appropriate section in /etc/lilo.conf. Adding 'append="<cmd_line_options>"'
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will do the trick as well.
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The syntax of 'cmd_line_options' is
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isp16=[<port>[,<irq>[,<dma>]]][[,]<drive_type>]
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If there is no ISP16 or compatibles detected, there's probably no harm done.
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These options indicate the values that your cdrom drive has been (or will be)
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configured to use.
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Valid values for the base i/o address are:
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port=0x340,0x320,0x330,0x360
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for the interrupt request number
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irq=0,3,5,7,9,10,11
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for the direct memory access line
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dma=0,3,5,6,7
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and for the type of drive
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drive_type=noisp16,Sanyo,Panasonic,Sony,Mitsumi.
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Note that these options are case sensitive.
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The values 0 for irq and dma indicate that they are not used, and
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the drive will be used in 'polling' mode. The values 5 and 7 for irq
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should be avoided in order to avoid any conflicts with optional
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sound card configuration.
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The syntax of the command line does not allow the specification of
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irq when there's nothing specified for the base address and no
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specification of dma when there is no specification of irq.
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The value 'noisp16' for drive_type, which may be used as the first
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non-integer option value (e.g. 'isp16=noisp16'), makes sure that probing
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for and subsequent configuration of an ISP16-compatible card is skipped
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all together. This can be useful to overcome possible conflicts which
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may arise while the kernel is probing your hardware.
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The default values are
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port=0x340
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irq=0
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dma=0
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drive_type=Sanyo
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reflecting my own configuration. The defaults can be changed in
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the file linux/drivers/cdrom/ips16.h.
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The cdrom interface can be configured at run time by loading the
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initialisation driver as a module. In that case, the interface
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parameters can be set by giving appropriate values on the command
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line. Configuring the driver can then be done by the following
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command (assuming you have iso16.o installed in a proper place):
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insmod isp16.o isp16_cdrom_base=<port> isp16_cdrom_irq=<irq> \
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isp16_cdrom_dma=<dma> isp16_cdrom_type=<drive_type>
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where port, irq, dma and drive_type can have any of the values mentioned
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above.
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Have fun!
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