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