why hdparm wont enable dma acc?

chickenjoy · 07-25-2007, 03:38 AM

hdparm -d1 /dev/hdc

Code:

/dev/hdc:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)

How can I permanently enable it? TIA

gilead · 07-25-2007, 07:02 PM

What type of drive is it? Can you run hdparm -I /dev/hdc and post the output here please?

chickenjoy · 07-26-2007, 01:11 AM

Code:

/dev/hdc:

ATAPI CD-ROM, with removable media
        Model Number:       Optiarc CD-RW CRX880A                   
        Serial Number:      
        Firmware Revision:  KX07    
Standards:
        Likely used CD-ROM ATAPI-1
Configuration:
        DRQ response: 50us.
        Packet size: 12 bytes
Capabilities:
        LBA, IORDY(can be disabled)
        DMA: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 udma0 udma1 *udma2 
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4 
             Cycle time: no flow control=120ns  IORDY flow control=120ns

thanks

nemestrinus · 09-17-2007, 03:46 PM

I had a similar problem after I installed Slackware 12.0 on a Toshiba Sattelite A135-S4527 laptop. Apparently it has something to do with the Intel SATA IDE controller. The solution was to disable IDE support in the kernel and make sure that PATA support was enabled in the ATA options. My Toshiba Installation notes are here:

http://danielroberts.org/doc/toshibalinux.html

chickenjoy · 09-17-2007, 08:26 PM

thanks for that! I'll try it out asap.