patch-pre2.0.13 linux/Documentation/cdrom/mcdx

• Lines: 75
• Date: Wed Jun 5 10:47:05 1996
• Orig file: pre2.0.12/linux/Documentation/cdrom/mcdx
• Orig date: Tue May 21 19:52:31 1996

diff -u --recursive --new-file pre2.0.12/linux/Documentation/cdrom/mcdx linux/Documentation/cdrom/mcdx
@@ -1,46 +1,44 @@
-This actually is an `improved' driver for the Mitsumi CD-ROM drives. 
+This is a first attempt to create an `improved' driver for the Mitsumi drives.
+It is able to "live together" with mcd.c, if you have at least two Mitsumi
+drives: each driver can use his own drive.
+
+To allow this "coexistence" as long as mcdx.c is not a superset of mcd.c,
+this driver has to use its own device files. We use MAJOR 20 for it. So,
+you have to do
 
-We are using the major device number 20 for it. So, you have to do
-
-~# mknod /dev/mcdx0 b 20 0
-~# mknod /dev/mcdx1 b 20 1
+ # mknod /dev/mcdx0 b 20 0
+ # mknod /dev/mcdx1 b 20 1
 
 and so on, one entry for each drive to support, once.
 
-If you are using the driver as a module, you can specify the ports and IRQs
-like:
-
- # insmod mcdx.o mcdx=0x300,11
+If you are using the driver as a module, you can specify your ports and IRQs
+like
 
-and so on ("address,IRQ" pairs). When You intend to use more then one
-drive, it's necessary to edit the mcdx.h file found in
-/usr/src/linux/include/linux. Instead of providing the values on the
-command line, You can "hardwire" them all in mcdx.h. The command line
-values take precedence over the values in mcdx.h. 
+ # insmod mcdx.o mcdx=0x300,11,0x304,5
 
-WARNING: BE CAREFUL TO SUPPLY THE CORRECT VALUES OTHERWISE THE WHOLE SYSTEM
-WILL HANG DURING BOOT-UP OR LOADING OF THE DRIVER!!!
+and so on ("address,IRQ" pairs).
+This will override the configuration in mcdx.h.
 
 This driver:
 
-	o	Handles XA and multi session CDs as well as ordinary CDs.
-	o	Supports up to 5 drives (of course, you'll need free 
-		IRQs, i/o ports and slots).
-	o	Uses *much* less kernel memory than the standard mcd driver.
-	o 	Plays audio like the `old' driver.
+    o   handles XA (and hopefully) multi session CDs as well as
+        ordinary CDs;
+    o   supports up to 5 drives (of course, you'll need free 
+        IRQs, i/o ports and slots);
+    o   uses much less kernel memory than the standard mcd driver
+        (no extra driver internal buffers!).
+        o   plays audio (like the `old' driver, I hope)
 
 This version doesn't support yet:
 
-	o	Shared IRQs, due to the fact that otherwise it wouldn't be
-		possible to distinguish the drives issuing the interrupt in the 
-		corresponding handling routine.
+    o   shared IRQs (but it seems to be possible - I've successfully
+                connected two drives to the same irq.  So it's `only' a 
+                problem of the driver.)
 
 This driver never will:
 
-	o	Read digital audio (i.e. copy directly), due to missing
-		hardware features. 
-	o	Do DMA transfers. This is simply far less efficient with such 
-		a slow device. Further, the SoundBlaster interfaces doesn't
-		support it, so it's not worth the effort.
+    o   Read digital audio (i.e. copy directly), due to missing
+        hardware features. 
+
 
-1996/05/20 Marcin Dalecki <dalecki@namu03.gwdg.de>
+heiko@lotte.sax.de