197 lines
7.4 KiB
Plaintext
197 lines
7.4 KiB
Plaintext
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CDU31A/CDU33A Driver Info
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-------------------------
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Information on the Sony CDU31A/CDU33A CDROM driver for the Linux
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kernel.
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Corey Minyard (minyard@metronet.com)
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Colossians 3:17
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Crude Table of Contents
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-----------------------
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Setting Up the Hardware
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Configuring the Kernel
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Configuring as a Module
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Driver Special Features
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This device driver handles Sony CDU31A/CDU33A CDROM drives and
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provides a complete block-level interface as well as an ioctl()
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interface as specified in include/linux/cdrom.h). With this
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interface, CDROMs can be accessed, standard audio CDs can be played
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back normally, and CD audio information can be read off the drive.
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Note that this will only work for CDU31A/CDU33A drives. Some vendors
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market their drives as CDU31A compatible. They lie. Their drives are
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really CDU31A hardware interface compatible (they can plug into the
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same card). They are not software compatible.
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Setting Up the Hardware
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-----------------------
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The CDU31A driver is unable to safely tell if an interface card is
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present that it can use because the interface card does not announce
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its presence in any way besides placing 4 I/O locations in memory. It
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used to just probe memory and attempt commands, but Linus wisely asked
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me to remove that because it could really screw up other hardware in
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the system.
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Because of this, you must tell the kernel where the drive interface
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is, what interrupts are used, and possibly if you are on a PAS-16
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soundcard.
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If you have the Sony CDU31A/CDU33A drive interface card, the following
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diagram will help you set it up. If you have another card, you are on
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your own. You need to make sure that the I/O address and interrupt is
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not used by another card in the system. You will need to know the I/O
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address and interrupt you have set. Note that use of interrupts is
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highly recommended, if possible, it really cuts down on CPU used.
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Unfortunately, most soundcards do not support interrupts for their
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CDROM interfaces. By default, the Sony interface card comes with
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interrupts disabled.
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+----------+-----------------+----------------------+
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| JP1 | 34 Pin Conn | |
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| JP2 +-----------------+ |
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| JP3 |
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| JP4 |
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| +--+
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| | +-+
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| | | | External
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| | | | Connector
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| +--+
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| +--------+
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+------------------------------------------+
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JP1 sets the Base Address, using the following settings:
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Address Pin 1 Pin 2
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------- ----- -----
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0x320 Short Short
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0x330 Short Open
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0x340 Open Short
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0x360 Open Open
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JP2 and JP3 configure the DMA channel; they must be set the same.
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DMA Pin 1 Pin 2 Pin 3
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--- ----- ----- -----
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1 On Off On
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2 Off On Off
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3 Off Off On
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JP4 Configures the IRQ:
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IRQ Pin 1 Pin 2 Pin 3 Pin 4
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--- ----- ----- ----- -----
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3 Off Off On Off
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4 Off Off* Off On
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5 On Off Off Off
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6 Off On Off Off
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The documentation states to set this for interrupt
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4, but I think that is a mistake.
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Note that if you have another interface card, you will need to look at
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the documentation to find the I/O base address. This is specified to
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the SLCD.SYS driver for DOS with the /B: parameter, so you can look at
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you DOS driver setup to find the address, if necessary.
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Configuring the Kernel
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----------------------
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You must tell the kernel where the drive is at boot time. This can be
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done at the Linux boot prompt, by using LILO, or by using Bootlin.
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Note that this is no substitute for HOWTOs and LILO documentation, if
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you are confused please read those for info on bootline configuration
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and LILO.
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At the linux boot prompt, press the ALT key and add the following line
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after the boot name (you can let the kernel boot, it will tell you the
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default boot name while booting):
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cdu31a=<base address>,<interrupt>[,PAS]
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The base address needs to have "0x" in front of it, since it is in
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hex. For instance, to configure a drive at address 320 on interrupt 5,
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use the following:
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cdu31a=0x320,5
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I use the following boot line:
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cdu31a=0x1f88,0,PAS
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because I have a PAS-16 which does not support interrupt for the
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CDU31A interface.
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Adding this as an append line at the beginning of the /etc/lilo.conf
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file will set it for lilo configurations. I have the following as the
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first line in my lilo.conf file:
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append="cdu31a=0x1f88,0"
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I'm not sure how to set up Bootlin (I have never used it), if someone
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would like to fill in this section please do.
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Configuring as a Module
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-----------------------
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The driver supports loading as a module. However, you must specify
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the boot address and interrupt on the boot line to insmod. You can't
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use modprobe to load it, since modprobe doesn't support setting
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variables.
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Anyway, I use the following line to load my driver as a module
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/sbin/insmod /lib/modules/`uname -r`/misc/cdu31a.o cdu31a_port=0x1f88
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You can set the following variables in the driver:
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cdu31a_port=<I/O address> - sets the base I/O. If hex, put 0x in
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front of it. This must be specified.
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cdu31a_irq=<interrupt> - Sets the interrupt number. Leaving this
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off will turn interrupts off.
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Driver Special Features
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-----------------------
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This section describes features beyond the normal audio and CD-ROM
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functions of the drive.
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2048 byte buffer mode
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If a disk is mounted with -o block=2048, data is copied straight from
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the drive data port to the buffer. Otherwise, the readahead buffer
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must be involved to hold the other 1K of data when a 1K block
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operation is done. Note that with 2048 byte blocks you cannot execute
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files from the CD.
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XA compatibility
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The driver should support XA disks for both the CDU31A and CDU33A. It
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does this transparently, the using program doesn't need to set it.
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Multi-Session
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A multi-session disk looks just like a normal disk to the user. Just
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mount one normally, and all the data should be there. A special
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thanks to Koen for help with this!
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Raw sector I/O
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Using the CDROMREADAUDIO it is possible to read raw audio and data
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tracks. Both operations return 2352 bytes per sector. On the data
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tracks, the first 12 bytes is not returned by the drive and the value
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of that data is indeterminate.
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