Creation of Cybook 2416 (actually Gen4) repository
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Documentation/cdrom/cm206
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Documentation/cdrom/cm206
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This is the readme file for the driver for the Philips/LMS cdrom drive
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cm206 in combination with the cm260 host adapter card.
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(c) 1995 David A. van Leeuwen
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Changes since version 0.99
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--------------------------
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- Interfacing to the kernel is routed though an extra interface layer,
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cdrom.c. This allows runtime-configurable `behavior' of the cdrom-drive,
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independent of the driver.
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Features since version 0.33
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---------------------------
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- Full audio support, that is, both workman, workbone and cdp work
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now reasonably. Reading TOC still takes some time. xmcd has been
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reported to run successfully.
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- Made auto-probe code a little better, I hope
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Features since version 0.28
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---------------------------
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- Full speed transfer rate (300 kB/s).
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- Minimum kernel memory usage for buffering (less than 3 kB).
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- Multisession support.
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- Tray locking.
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- Statistics of driver accessible to the user.
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- Module support.
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- Auto-probing of adapter card's base port and irq line,
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also configurable at boot time or module load time.
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Decide how you are going to use the driver. There are two
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options:
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(a) installing the driver as a resident part of the kernel
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(b) compiling the driver as a loadable module
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Further, you must decide if you are going to specify the base port
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address and the interrupt request line of the adapter card cm260 as
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boot options for (a), module parameters for (b), use automatic
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probing of these values, or hard-wire your adaptor card's settings
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into the source code. If you don't care, you can choose
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autoprobing, which is the default. In that case you can move on to
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the next step.
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Compiling the kernel
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--------------------
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1) move to /usr/src/linux and do a
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make config
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If you have chosen option (a), answer yes to CONFIG_CM206 and
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CONFIG_ISO9660_FS.
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If you have chosen option (b), answer yes to CONFIG_MODVERSIONS
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and no (!) to CONFIG_CM206 and CONFIG_ISO9660_FS.
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2) then do a
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make clean; make zImage; make modules
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3) do the usual things to install a new image (backup the old one, run
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`rdev -R zImage 1', copy the new image in place, run lilo). Might
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be `make zlilo'.
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Using the driver as a module
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----------------------------
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If you will only occasionally use the cd-rom driver, you can choose
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option (b), install as a loadable module. You may have to re-compile
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the module when you upgrade the kernel to a new version.
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Since version 0.96, much of the functionality has been transferred to
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a generic cdrom interface in the file cdrom.c. The module cm206.o
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depends on cdrom.o. If the latter is not compiled into the kernel,
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you must explicitly load it before cm206.o:
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insmod /usr/src/linux/modules/cdrom.o
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To install the module, you use the command, as root
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insmod /usr/src/linux/modules/cm206.o
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You can specify the base address on the command line as well as the irq
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line to be used, e.g.
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insmod /usr/src/linux/modules/cm206.o cm206=0x300,11
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The order of base port and irq line doesn't matter; if you specify only
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one, the other will have the value of the compiled-in default. You
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may also have to install the file-system module `iso9660.o', if you
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didn't compile that into the kernel.
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Using the driver as part of the kernel
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--------------------------------------
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If you have chosen option (a), you can specify the base-port
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address and irq on the lilo boot command line, e.g.:
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LILO: linux cm206=0x340,11
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This assumes that your linux kernel image keyword is `linux'.
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If you specify either IRQ (3--11) or base port (0x300--0x370),
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auto probing is turned off for both settings, thus setting the
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other value to the compiled-in default.
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Note that you can also put these parameters in the lilo configuration file:
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# linux config
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image = /vmlinuz
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root = /dev/hda1
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label = Linux
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append = "cm206=0x340,11"
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read-only
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If module parameters and LILO config options don't work
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-------------------------------------------------------
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If autoprobing does not work, you can hard-wire the default values
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of the base port address (CM206_BASE) and interrupt request line
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(CM206_IRQ) into the file /usr/src/linux/drivers/cdrom/cm206.h. Change
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the defines of CM206_IRQ and CM206_BASE.
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Mounting the cdrom
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------------------
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1) Make sure that the right device is installed in /dev.
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mknod /dev/cm206cd b 32 0
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2) Make sure there is a mount point, e.g., /cdrom
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mkdir /cdrom
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3) mount using a command like this (run as root):
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mount -rt iso9660 /dev/cm206cd /cdrom
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4) For user-mounts, add a line in /etc/fstab
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/dev/cm206cd /cdrom iso9660 ro,noauto,user
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This will allow users to give the commands
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mount /cdrom
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umount /cdrom
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If things don't work
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--------------------
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- Try to do a `dmesg' to find out if the driver said anything about
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what is going wrong during the initialization.
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- Try to do a `dd if=/dev/cm206cd | od -tc | less' to read from the
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CD.
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- Look in the /proc directory to see if `cm206' shows up under one of
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`interrupts', `ioports', `devices' or `modules' (if applicable).
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DISCLAIMER
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----------
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I cannot guarantee that this driver works, or that the hardware will
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not be harmed, although I consider it most unlikely.
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I hope that you'll find this driver in some way useful.
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David van Leeuwen
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david@tm.tno.nl
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Note for Linux CDROM vendors
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-----------------------------
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You are encouraged to include this driver on your Linux CDROM. If
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you do, you might consider sending me a free copy of that cd-rom.
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You can contact me through my e-mail address, david@tm.tno.nl.
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If this driver is compiled into a kernel to boot off a cdrom,
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you should actually send me a free copy of that cd-rom.
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Copyright
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---------
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The copyright of the cm206 driver for Linux is
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(c) 1995 David A. van Leeuwen
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The driver is released under the conditions of the GNU general public
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license, which can be found in the file COPYING in the root of this
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source tree.
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