1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
197 lines
7.4 KiB
Plaintext
197 lines
7.4 KiB
Plaintext
|
|
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.
|