readme.linux

刻录光盘的程序

WARNING: Do not use 'mc' to extract the tar file!
All mc versions before 4.0.14 cannot extract symbolic links correctly.

Linux includes the gnu make program by default but it is called 'make' on linux.
You will definitely need the shell script Gmake.linux to use gmake
on a linux system.

Install it as /usr/bin/Gmake with:

cp Gmake.linux /usr/bin/Gmake

Then compile the system by calling:

/usr/bin/Gmake
or ./Gmake.linux

NOTES for S.u.S.E distributions: you must unset an environment variable
called PROMPT_COMMAND
It contains illegal values for a make file system.

		I M P O R T A N T :

If you have any problems to access a device on the SCSI bus, check your
/dev/sg devices first. Your system should either only have /dev/sga...
or /dev/sg0... The newer Linux kernel use /dev/sg0... so the actual
SCSI transport code checks for /dev/sg0... first. Many Linux installations
have too few /dev/sg* device nodes. This is because of the funny device 
mapping. It may be possible that one SCSI device eats up 8 /dev/sg* entries.
I recommend to have at least 20 /dev/sg* device nodes.

In any case: first read the man page for hints how to specify the device.
If nothing helps, first run e.g. cdrecord -scanbus. If this does not find
your device, the problem is in your kernel or system installation.
If scanning the bus finds the device, you are using the wrong device name.
If nothing help try to call e.g. strace cdrecord 

Linux ATAPI hints:

Read README.ATAPI to learn how to use ATAPI drives with the SCSI transport
library.

Linux SCSI hints:

If you want to use the user SCSI library on a target that is connected
to a SCSI hostadapter which is not the first, you need to apply a patch
to your Linux kernel code. This patch is located in the file 

Linux.scsi-patch

Please chdir to /usr/src, call
patch  < Linux.scsi-patch
and re-compile and re-install your kernel.

Linux kernels past 2.0.30 will probably already have this patch included.

I recommend to use Linux 2.0.35 or later or Linux 2.1.115 or later.
These versions of Linux will include ATAPI support in a way needed by cdrecord.
Linux 2.1.115 or newer will in addition support the Parallel Port / ATAPI
adapters found in some CD-R or CD-RW drives.

IMPORTANT:

-	Although cdrecord supports to use dev=/dev/sgc, it is not recommended
	and it is unsupported.

	The /dev/sg* device mapping in Linux is not stable! Using dev=/dev/sgc
	in a shell script may fail after a reboot because the device you want
	to talk to has moved to /dev/sgd. For the proper and OS independant
	dev=<bus>,<tgt>,<lun> syntax read the man page of cdrecord.

-	In some architectures (at least on sparc / alpha / ppc) kernels prior
	to 2.0.32 are not usable because the call to mlockall() kills cdrecord.

-	If you get a message like:

		cdrecord: Function not implemented. shmget failed

	You removed SVSv IPC from your kernel. You need to enable it again.

-       You may need to edit /usr/src/linux/include/asm*/shmparam.h to allow at least 
        4 MB of shared memory for your architecture by modifying SHMMAX
	and re-compile/re-install Linux !
	(note that Linux for Intel by default allows 16 MB) 

	Do this by e.g. changing the #define for SHMMAX to:

	#define SHMMAX 0x1000000                /* max shared seg size (bytes) */

	This will allow 16 MB for shared memory.

-	If you get the message: "Cannot allocate memory. Cannot send SCSI cmd via ioctl"
	Your kernel/include files are inconsistent.

		This seems to be the case with most actual Linux kernels!!!!!!

	Make sure, that the include file /usr/src/linux/include/scsi/sg.h
	reflects the actual kernel. Usually, the files /usr/include/scsi/sg.h
	and /usr/src/linux/include/scsi/sg.h should be identical.

	**** Never change the content of /usr/src/linux/include/scsi/sg.h without
	properly recompiling the kernel. Cdrecord depends on the fact that
	the value of the define SG_BIG_BUFF uses the same value as the actual
	kernel. Use cdrecord -scanbus -debug to get the value of SG_BIG_BUFF
	with cdrecorrd has been compiled. An output of:

		scsi_getbuf: 32768 bytes

	indicates that cdrecord has been compiled with 32k SG_BIG_BUF

	The Linux 'sg' driver is the worst driver design, I've ever seen.

Joerg