Kernel 2.6 dvd writer ide-scsi emulation

chup · 12-29-2003, 07:44 PM

I'm going to run kernel 2.6 soon, after I fix my modules problem, but I've got a question about it (the kernel).
When configuring it, I came acros an option "enable ide-scsi emulation", as I need this so that my dvd writer will write.
But, in order to play dvd's, I need to disable the scsi emulation on the writer so that I can enable DMA on it.
Im now using kernel 2.4.20, and I have slightly different boot options to the same kernel in grub to enable scsi emulation or not.
How will I do this when running kernel 2.6?

tricky_linux · 12-29-2003, 09:47 PM

i don't get the idea that you need to disable dma to play dvd. you you could enable dma mode while your drive was still scsi emulated.
assuming that your drive was /dev/hdc or /dev/scd0 after scsi emulation.
just do "hdparm -d1 /dev/hdc"

Quadreg · 12-30-2003, 04:45 AM

My DVD writer has scsi emulation and is mounted at /dev/sr0 (and I have kernel 2.6).
I can write and play DVDs without changing anything.

chup · 12-30-2003, 06:24 AM

this is weird, I must have done something wrong or my drive doesnt support dma at all

Code:

hdparm -d 1 /dev/sr0
/dev/sr0 not supported by hdparm

Quadreg · 12-30-2003, 06:40 AM

no, that is normal (I think

)
I have that same error (?)

tricky_linux · 12-30-2003, 08:28 PM

it's not normal. the reason why you gotten error was because you did the wrong thing in order to enable your dma.
assume that hdc=ide-scsi was add to your boot loader which means originally your drive was mounted as /dev/hdc.
what you should do was "hdparm -d1 /dev/hdc"

core · 01-02-2004, 05:05 AM

Quote:

Originally posted by chup
I'm going to run kernel 2.6 soon, after I fix my modules problem, but I've got a question about it (the kernel).
When configuring it, I came acros an option "enable ide-scsi emulation", as I need this so that my dvd writer will write.

With kernel 2.6.0 you should disable the ide-scsi Emulation. the current cdrecord version works with plain ATAPI mode.. cdrecord -scanbus dev=ATAPI
The current CVS Version of cdrdao also has ATAPI Support..

ide-scsi emulation for cd/dvd-writers is depreciated.

tricky_linux · 01-02-2004, 10:47 AM

but the thing was that wouldn't scsi-ide emulation would make the drive's performance higher?

thegeekster · 01-02-2004, 11:29 AM

Quote:

Originally posted by tricky_linux
but the thing was that wouldn't scsi-ide emulation would make the drive's performance higher?

I just upgraded to kernel 2.6.0 and had left the ide-scsi emulation in lilo.conf. During bootup, I recieved this message:

Code:

ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device

The ide-scsi emulation still worked okay and my cd-rw was still remapped to /dev/sr0.............Just thought I'd bring this to everyone's attention, tho'

tricky_linux · 01-02-2004, 06:20 PM

i am not quite understand what the passage are trying to say.
say "hdc=ide-scsi" in my grub.conf
what do i support to change it to?

I will appreciate for the answer.

thegeekster · 01-02-2004, 07:32 PM

Quote:

Originally posted by tricky_linux
i am not quite understand what the passage are trying to say.
say "hdc=ide-scsi" in my grub.conf
what do i support to change it to?

I will appreciate for the answer.

You can replace it with "hdc=ide-cd" in the config file..........although I think you can remove that line altogether. I'm not totally sure, but 'ide-cd' may be the default..........I just replaced 'ide-scsi' with 'ide-cd' in my lilo.conf file and left it at that.........

Without the scsi emulation, the cd/dvd writer will be mapped to the normal '/dev/cdrom' (or whatever the default for your distro is), which will be linked to '/dev/hdc' in your case