[ltp] Enabling DMA for T41?

[Yip Wai Peng]

Hi,
I would like to know whether anybody has enabled DMA for T41 yet. I can't 
seems to do it.

root # hdparm -d1 /dev/hda

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

kernal is already 
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_IDEDMA_AUTO=y

HD info are as follows
root # hdparm -i /dev/hda

/dev/hda:

 Model=FUJITSU MHT2040AH, FwRev=006C, SerialNo=NP0JT4527113
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
 BuffType=DualPortCache, BuffSize=8192kB, MaxMultSect=16, MultSect=16
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=71123954
 IORDY=yes, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
 AdvancedPM=yes: mode=0x80 (128) WriteCache=enabled
 Drive conforms to: ATA/ATAPI-6 T13 1410D revision 3a:

I would like to know whether anybody has gotten a working configuration, and 
can you post the results of hdparm -Tt /dev/hda as compared to mine?

/dev/hda:
 Timing buffer-cache reads:   1780 MB in  2.00 seconds = 888.36 MB/sec
 Timing buffered disk reads:   22 MB in  3.14 seconds =   7.02 MB/sec

Thanks,
Waipeng