Messages in this thread | | | Date | Wed, 26 Feb 2003 10:56:34 -0500 | From | jpiszcz <> | Subject | Re: Question about DMA and cd burning. |
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Yes, hdparm -d1 /dev/hd{b,c} did not work on older kernels for me, but 2.4.20 appears to work successfully.
However, second question, both of my Plextors support UDMA2, and both are on 80 PIN/IDE cables, when I enabled -d1 -X66, the kernel, it crashed the kernel.
Feb 26 10:30:55 war kernel: hdc: drive_cmd: status=0x41 { DriveReady Error } Feb 26 10:30:55 war kernel: hdc: drive_cmd: error=0x04 Feb 26 10:30:59 war kernel: hdc: drive_cmd: status=0x41 { DriveReady Error } Feb 26 10:30:59 war kernel: hdc: drive_cmd: error=0x04 Feb 26 10:31:02 war kernel: hdc: drive_cmd: status=0x41 { DriveReady Error } Feb 26 10:31:02 war kernel: hdc: drive_cmd: error=0x04 Feb 26 10:32:22 war kernel: scsi : aborting command due to timeout : pid 11206, scsi1, channel 0, id 1, lun 0 Read (10) 00 00 00 00 00 00 00 02 00 Feb 26 10:32:22 war kernel: hdc: timeout waiting for DMA Feb 26 10:32:22 war kernel: ide_dmaproc: chipset supported ide_dma_timeout func only: 14 Feb 26 10:32:22 war kernel: hdc: status timeout: status=0xd8 { Busy } Feb 26 10:32:22 war kernel: hdc: drive not ready for command
After this, X froze and the keyboard lights were blinking, I could not change to console or anything to see the kernel messages.
1] Why does the kernel turn DMA off by default? config: http://installkernel.tripod.com/config-2.4.20.txt 2] Why does the kernel crash when I try to enable UDMA2 on the cdrw?
vishwas@india.hp.com wrote:
> use: hdparam -d1 /dev/<hdX> > > to enable DMA, if it still says it cannot enable DMA. > try enabling the xfermode,which gives me the same > performace as DMA enabled. > > hdparam -X<num> /dev/<hdX> > put num greater than 32..like 33,34 etc (for multiword DMA) > OR greater that 64....like 65 66 etc. (for UltraDMA) > > -vvp > > > > > > > > > > >
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