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This is the readme file for the driver for the Philips/LMS cdrom drive

cm206 in combination with the cm260 host adapter card.

                                (c) 1995 David A. van Leeuwen

Changes since version 0.99

--------------------------

- Interfacing to the kernel is routed though an extra interface layer,

  cdrom.c. This allows runtime-configurable `behavior' of the cdrom-drive,

  independent of the driver.

Features since version 0.33

---------------------------

- Full audio support, that is, both  workman, workbone and cdp work

  now reasonably. Reading TOC still takes some time. xmcd has been

  reported to run successfully.

- Made auto-probe code a little better, i hope

Features since version 0.28

---------------------------

- Full speed transfer rate (300 kB/s).

- Minimum kernel memory usage for buffering (less than 3 kB).

- Multisession support.

- Tray locking.

- Statistics of driver accessible to the user.

- Module support.

- Auto-probing of adapter card's base port and irq line,

  also configurable at boot time or module load time.

Decide how you are going to use the driver. There are two

options:

   (a) installing the driver as a resident part of the kernel

   (b) compiling the driver as a loadable module

   Further, you must decide if you are going to specify the base port

   address and the interrupt request line of the adapter card cm260 as

   boot options for (a), module parameters for (b), use automatic

   probing of these values, or hard-wire your adaptor cards settings

   into the source code. If you don't care, you can choose for

   autoprobing, which is the default. In that case you can move on to

   the next step.

Compiling the kernel

--------------------

1) move to /usr/src/linux and do a

        make config

   If you have chosen for option (a), answer yes to CONFIG_CM206 and

   CONFIG_ISO9660_FS.

   If you have chosen for option (b), answer yes to CONFIG_MODVERSIONS

   and no (!) to CONFIG_CM206 and CONFIG_ISO9660_FS.

2) then do a

        make dep; make clean; make zImage; make modules

3) do the usual things to install a new image (backup the old one, run

   `rdev -R zImage 1', copy the new image in place, run lilo).  Might

   be `make zlilo'.

Using the driver as a module

----------------------------

If you will only seldomly use the cd-rom driver, you can choose for

option (b), install as a loadable module. You may have to re-compile

the module when you upgrade the kernel to a new version.

Since version 0.96, much of the functionality has been transferred to

a generic cdrom interface in the file cdrom.c. The module cm206.o

depends on cdrom.o. If the latter is not compiled into the kernel,

you must explicitly load it before cm206.o:

         insmod /usr/src/linux/modules/cdrom.o

To install the module, you use the command, as root

        insmod /usr/src/linux/modules/cm206.o

You can specify the base address on the command line as well as the irq

line to be used, e.g.

        insmod /usr/src/linux/modules/cm206.o cm206=0x300,11

The order of base port and irq line doesn't matter; you may specify only

one, the other will have the value of the compiled-in default.  You

may also have to install the file-system module `iso9660.o', if you

didn't compile that into the kernel.

Using the driver as part of the kernel

--------------------------------------

If you have chosen for option a, you can specify the base-port

address and irq on the lilo boot command line, e.g.:

        LILO: linux cm206=0x340,11

This assumes that your linux kernel image keyword is `linux'.

If you may specify either IRQ (3--11) or base port (0x300--0x370),

auto probing is turned off for both settings, thus setting the

other value to the compiled-in default.

Note that you can put these parameters also in the lilo configuration file:

# linux config

image = /vmlinuz

   root = /dev/hda1

   label = Linux

   append = "cm206=0x340,11"

   read-only

If module parameters and LILO config options don't work

-------------------------------------------------------

If autoprobing does not work, you can hard-wire the default values

of the base port address (CM206_BASE) and interrupt request line

(CM206_IRQ) into the file ./include/linux/cm206.h. Change

the defines of CM206_IRQ and CM206_BASE.

Mounting the cdrom

------------------

1) Make sure that there is the right device installed in /dev.

        mknod /dev/cm206cd b 32 0

2) Make sure there is a mount point, e.g., /cdrom

        mkdir /cdrom

3) mount using a command like this (run as root):

        mount -rt iso9660 /dev/cm206cd /cdrom

4) For user-mounts, add a line in /etc/fstab

        /dev/cm206cd      /cdrom     iso9660    ro,noauto,user

   This will allow users to give the commands

        mount /cdrom

        umount /cdrom

If things don't work

--------------------

- Try to do a `dmesg' to find out if the driver said anything about

  what is going wrong during the initialization.

- Try to do a `dd if=/dev/cm206cd | od -tc | less' to read from the

  CD.

- Look in the /proc directory to see if `cm206' shows up under one of

  `interrupts', `ioports', `devices' or `modules' (if applicable).

DISCLAIMER

----------

I cannot guarantee that this driver works, or that the hardware will

not be harmed, although i consider it most unlikely.

I hope that you'll find this driver in some way useful.

                                        David van Leeuwen

                                        david@tm.tno.nl

Note for Linux CDROM vendors

-----------------------------

You are encouraged to include this driver on your Linux CDROM. If

you do, you might consider sending me a free copy of that cd-rom.

You can contact me through my e-mail address, david@tm.tno.nl.

If this driver is compiled into a kernel to boot off a cdrom,

you should actually send me a free copy of that cd-rom.

Copyright

---------

The copyright of the cm206 driver for Linux is

    (c) 1995 David A. van Leeuwen

The driver is released under the conditions of the GNU general public

license, which can be found in the file COPYING in the root of this

source tree.