> -----Original Message-----
> From: Thomas Molina [mailto:tmolina@home.com]
> Sent: Thursday, 28 October 1999 3:24
> To: linux-kernel@vger.rutgers.edu
> Subject: Setting UDMA on ide drives
>
>
> I'm not sure what I'm doing wrong in setting UDMA for my ide drives.
> See the following:
>
> /dev/hda:
> setting using_dma to 1 (on)
> HDIO_SET_DMA failed: Operation not permitted
> using_dma = 0 (off)
> [root@wr5z Documentation]# hdparm -d1 /dev/hdb
>
> /dev/hdb:
> setting using_dma to 1 (on)
> HDIO_SET_DMA failed: Operation not permitted
> using_dma = 0 (off)
>
> Information on both drives seem to indicate this should be possible.
>
> [root@wr5z Documentation]# hdparm -i /dev/hda
>
> /dev/hda:
>
> Model=SAMSUNG VG34323A (4.32GB), FwRev=GQ101, SerialNo=ST18917092e5b4
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
> RawCHS=14896/9/63, TrkSize=32256, SectSize=512, ECCbytes=21
> BuffType=3(DualPortCache), BuffSize=496kB, MaxMultSect=16,
> MultSect=off
> DblWordIO=no, maxPIO=2(fast), DMA=yes, maxDMA=2(fast)
> CurCHS=525/255/63, CurSects=-531627904, LBA=yes, LBA=yes,
> LBAsects=8446032
> tDMA={min:120,rec:120}, DMA modes: sword0 sword1 sword2
> *mword0 mword1
> mword2
> IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
> UDMA modes: mode0 mode1 *mode2
>
> [root@wr5z Documentation]# hdparm -i /dev/hdb
>
> /dev/hdb:
>
> Model=WDC AC14300R, FwRev=15.01J55, SerialNo=WD-WM6260183946
> Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs
> FmtGapReq }
> RawCHS=8912/15/63, TrkSize=57600, SectSize=600, ECCbytes=40
> BuffType=3(DualPortCache), BuffSize=512kB, MaxMultSect=16,
> MultSect=off
> DblWordIO=no, maxPIO=2(fast), DMA=yes, maxDMA=0(slow)
> CurCHS=524/255/63, CurSects=-2117074816, LBA=yes, LBA=yes,
> LBAsects=8421840
> tDMA={min:120,rec:120}, DMA modes: mword0 mword1 *mword2
> IORDY=on/off, tPIO={min:160,w/IORDY:120}, PIO modes: mode3 mode4
> UDMA modes: mode0 mode1 mode2
>
> Could someone provide the clue, or mention TFM to R. The cable is 14
> inches, and adding ide0=dma seems to have no effect.
>
>
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