DMA problem

Hello !

Sorry to post a seconfd message on the list, I am only trying to get an answern for this - it seems so - DMA-problem ??

I have some
problems with a brand new Plextor-drive, PX-W5224TA/T3B, I cannot mount any CD or burn a CDR or CD-RW, except if I disable DMA with following command :# hdparm -d0 /dev/hdd , a little bit annoying, isn't it ?

If I insert a cdrom in the drive the led doesn't go out, it flashes as usual but it stays green.

It seems to be a DMA-problem or a kernel-bug ??? Its only a supposition, I am a Linux-newbie, and I am looking for an explanation and a solution ....

By mounting a cdrom I get following error messages :

Jan 11 20:46:00 ishwara kernel: scsi : aborting command due to timeout

: pid 102, scsi0, channel 0, id 1, lun 0 0x28 00 00 00 00 10 00 00 01 00

Jan 11 20:46:00 ishwara kernel: hdd: error waiting for DMA
Jan 11 20:46:00 ishwara kernel: hdd: dma timeout retry: status=0x7f {
DriveReady DeviceFault SeekComplete DataRequest CorrectedError Index
Error } Jan 11 20:46:00 ishwara kernel: hdd: dma timeout retry:
error=0x7f Jan 11 20:46:00 ishwara kernel: hdd: DMA disabled
Jan 11 20:46:00 ishwara kernel: hdd: ATAPI reset complete
Jan 11 20:46:00 ishwara kernel: hdd: irq timeout: status=0x80 { Busy }
Jan 11 20:46:00 ishwara kernel: hdd: ATAPI reset complete
Jan 11 20:46:00 ishwara kernel: hdd: irq timeout: status=0x80 { Busy }
Jan 11 20:46:00 ishwara kernel: hdd: ATAPI reset complete
Jan 11 20:46:07 ishwara kernel: hdd: irq timeout: status=0x80 { Busy }
Jan 11 20:46:07 ishwara kernel: scsi0 channel 0 : resetting for second

half of retries. Jan 11 20:46:07 ishwara kernel: SCSI bus is being reset for host 0 channel 0. Jan 11 20:46:07 ishwara kernel: hdd: status
timeout: status=0x80 { Busy } Jan 11 20:46:07 ishwara kernel: hdd: drive not ready for command Jan 11 20:46:07 ishwara kernel: hdd: ATAPI reset complete Jan 11 20:46:32 ishwara kernel: scsi : aborting command due to timeout : pid 103, scsi0, channel 0, id 1, lun 0 0x28 00 00 00 00 10 00 rive not ready for command

And then I have a freeze or at least a blocking of the sysem. I have to reboot.

Could someone give me an explanation of what is happening and a way to solve the problem .... is this a kernel-bug ? Or an incompatibility between the motherboard and the drive ??

If you choose to help me, please don't be to esoteric, as I already said, I am a newbie.

Please, could you Cc all answers to the adress :

[email protected]

My apologizes for my english ....

Claude

System : Pentium 2,8C
Asus P4P800 DeLuxe
Intel I865PE

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