HDIO_SET_DMA failed: Operation not permitted

[Santosh Kumar Cheekatmalla]

Hi Everyone,

I am using RED HAT Linux 7.3 ...

when i tried to set DMA on

# /sbin/hdparm -d 1 /hda/hdb

I get following message.

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

I am using Intelchipset motherborad, and Maxtor hard
drive

Can you please help me enable DMA on my machine.

I am new to linux , so can you be little elaborate in your reply
thanks..

   Another doubt my hard drive is detected as /dev/hdb instead of /dev/hda..
does that make any difference.. Please help.. why is it so.. ?

I just made sure that both my Intel mother borad and
Maxtor hard drive support the DMA. But iam unable to switch it on.

the message in /var/log/messages

Jan 21 18:19:29 backend01 kernel: ide0: unexpected interrupt, status=0x58, 
count=1

and

dmesg gives the following result

Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PCI_IDE: unknown IDE controller on PCI bus 00 device f9, VID=8086, DID=24cb
PCI: Device 00:1f.1 not available because of resource collisions
PCI_IDE: (ide_setup_pci_device:) Could not enable device.
hdb: C/H/S=0/0/0 from BIOS ignored
hdb: Maxtor 2F040J0, ATA DISK drive
hdc: CDU5211, ATAPI CD/DVD-ROM drive

# /sbin/hdparm -iv /dev/hdb

/dev/hdb:
multcount    = 16 (on)
I/O support  =  3 (32-bit w/sync)
unmaskirq    =  0 (off)
using_dma    =  0 (off)
keepsettings =  0 (off)
nowerr       =  0 (off)
readonly     =  0 (off)
readahead    =  8 (on)
geometry     = 79656/16/63, sectors = 80293248, start
= 0

Model=Maxtor 2F040J0, FwRev=VAM51JJ0,
SerialNo=F12WD7TE
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0,ECCbytes=57
BuffType=DualPortCache, BuffSize=2048kB,MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes,LBAsects=80293248
IORDY=on/off, tPIO={min:120,w/IORDY:120},tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3udma4 *udma5 udma6
AdvancedPM=yes: disabled (255) WriteCache=enabled
Drive Supports : ataATA-1 ATA-2 ATA-3 ATA-4 ATA-5ATA-6 ATA-7

busstate     =  1 (on)

Can you please tell me what should i do to enable DMA
support.

Thanks
Santosh

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