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diff --git a/Documentation/cdrom/cdu31a b/Documentation/cdrom/cdu31a new file mode 100644 index 0000000..c0667da --- /dev/null +++ b/Documentation/cdrom/cdu31a @@ -0,0 +1,196 @@ + + CDU31A/CDU33A Driver Info + ------------------------- + +Information on the Sony CDU31A/CDU33A CDROM driver for the Linux +kernel. + + Corey Minyard (minyard@metronet.com) + + Colossians 3:17 + +Crude Table of Contents +----------------------- + + Setting Up the Hardware + Configuring the Kernel + Configuring as a Module + Driver Special Features + + +This device driver handles Sony CDU31A/CDU33A CDROM drives and +provides a complete block-level interface as well as an ioctl() +interface as specified in include/linux/cdrom.h). With this +interface, CDROMs can be accessed, standard audio CDs can be played +back normally, and CD audio information can be read off the drive. + +Note that this will only work for CDU31A/CDU33A drives. Some vendors +market their drives as CDU31A compatible. They lie. Their drives are +really CDU31A hardware interface compatible (they can plug into the +same card). They are not software compatible. + +Setting Up the Hardware +----------------------- + +The CDU31A driver is unable to safely tell if an interface card is +present that it can use because the interface card does not announce +its presence in any way besides placing 4 I/O locations in memory. It +used to just probe memory and attempt commands, but Linus wisely asked +me to remove that because it could really screw up other hardware in +the system. + +Because of this, you must tell the kernel where the drive interface +is, what interrupts are used, and possibly if you are on a PAS-16 +soundcard. + +If you have the Sony CDU31A/CDU33A drive interface card, the following +diagram will help you set it up. If you have another card, you are on +your own. You need to make sure that the I/O address and interrupt is +not used by another card in the system. You will need to know the I/O +address and interrupt you have set. Note that use of interrupts is +highly recommended, if possible, it really cuts down on CPU used. +Unfortunately, most soundcards do not support interrupts for their +CDROM interfaces. By default, the Sony interface card comes with +interrupts disabled. + + +----------+-----------------+----------------------+ + | JP1 | 34 Pin Conn | | + | JP2 +-----------------+ | + | JP3 | + | JP4 | + | +--+ + | | +-+ + | | | | External + | | | | Connector + | | | | + | | +-+ + | +--+ + | | + | +--------+ + | | + +------------------------------------------+ + + JP1 sets the Base Address, using the following settings: + + Address Pin 1 Pin 2 + ------- ----- ----- + 0x320 Short Short + 0x330 Short Open + 0x340 Open Short + 0x360 Open Open + + JP2 and JP3 configure the DMA channel; they must be set the same. + + DMA Pin 1 Pin 2 Pin 3 + --- ----- ----- ----- + 1 On Off On + 2 Off On Off + 3 Off Off On + + JP4 Configures the IRQ: + + IRQ Pin 1 Pin 2 Pin 3 Pin 4 + --- ----- ----- ----- ----- + 3 Off Off On Off + 4 Off Off* Off On + 5 On Off Off Off + 6 Off On Off Off + + The documentation states to set this for interrupt + 4, but I think that is a mistake. + +Note that if you have another interface card, you will need to look at +the documentation to find the I/O base address. This is specified to +the SLCD.SYS driver for DOS with the /B: parameter, so you can look at +you DOS driver setup to find the address, if necessary. + +Configuring the Kernel +---------------------- + +You must tell the kernel where the drive is at boot time. This can be +done at the Linux boot prompt, by using LILO, or by using Bootlin. +Note that this is no substitute for HOWTOs and LILO documentation, if +you are confused please read those for info on bootline configuration +and LILO. + +At the linux boot prompt, press the ALT key and add the following line +after the boot name (you can let the kernel boot, it will tell you the +default boot name while booting): + + cdu31a=<base address>,<interrupt>[,PAS] + +The base address needs to have "0x" in front of it, since it is in +hex. For instance, to configure a drive at address 320 on interrupt 5, +use the following: + + cdu31a=0x320,5 + +I use the following boot line: + + cdu31a=0x1f88,0,PAS + +because I have a PAS-16 which does not support interrupt for the +CDU31A interface. + +Adding this as an append line at the beginning of the /etc/lilo.conf +file will set it for lilo configurations. I have the following as the +first line in my lilo.conf file: + + append="cdu31a=0x1f88,0" + +I'm not sure how to set up Bootlin (I have never used it), if someone +would like to fill in this section please do. + + +Configuring as a Module +----------------------- + +The driver supports loading as a module. However, you must specify +the boot address and interrupt on the boot line to insmod. You can't +use modprobe to load it, since modprobe doesn't support setting +variables. + +Anyway, I use the following line to load my driver as a module + + /sbin/insmod /lib/modules/`uname -r`/misc/cdu31a.o cdu31a_port=0x1f88 + +You can set the following variables in the driver: + + cdu31a_port=<I/O address> - sets the base I/O. If hex, put 0x in + front of it. This must be specified. + + cdu31a_irq=<interrupt> - Sets the interrupt number. Leaving this + off will turn interrupts off. + + +Driver Special Features +----------------------- + +This section describes features beyond the normal audio and CD-ROM +functions of the drive. + +2048 byte buffer mode + +If a disk is mounted with -o block=2048, data is copied straight from +the drive data port to the buffer. Otherwise, the readahead buffer +must be involved to hold the other 1K of data when a 1K block +operation is done. Note that with 2048 byte blocks you cannot execute +files from the CD. + +XA compatibility + +The driver should support XA disks for both the CDU31A and CDU33A. It +does this transparently, the using program doesn't need to set it. + +Multi-Session + +A multi-session disk looks just like a normal disk to the user. Just +mount one normally, and all the data should be there. A special +thanks to Koen for help with this! + +Raw sector I/O + +Using the CDROMREADAUDIO it is possible to read raw audio and data +tracks. Both operations return 2352 bytes per sector. On the data +tracks, the first 12 bytes is not returned by the drive and the value +of that data is indeterminate. |
