在ml1.2下打不开硬盘的dma???

yushuanglin

在控制台中用命令打不开dma:

[root@MagicLinux root]# hdparm -i /dev/hda

/dev/hda:

Model=QUANTUM FIREBALLP LM20.5, FwRev=A35.0700, SerialNo=884015862354
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=32256, SectSize=21298, ECCbytes=4
BuffType=DualPortCache, BuffSize=1900kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=40132503
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
UDMA modes: udma0 udma1 udma2 udma3 udma4
AdvancedPM=no WriteCache=enabled
Drive conforms to: ATA/ATAPI-5 T13 1321D revision 1:  1 2 3 4 5

[root@MagicLinux root]# /sbin/hdparm -c1 /dev/hda

/dev/hda:
setting 32-bit IO_support flag to 1
IO_support   =  1 (32-bit)
[root@MagicLinux root]# /sbin/hdparm -d1 /dev/hda

/dev/hda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma    =  0 (off)
[root@MagicLinux root]#