hdparm question: HDIO_SET_DMA failed: Inappropriate ioctl for device
Antonio Olivares
olivares14031 at yahoo.com
Tue Nov 27 13:54:56 UTC 2007
--- Jeff Spaleta <jspaleta at gmail.com> wrote:
> On Nov 26, 2007 4:30 PM, Antonio Olivares
> <olivares14031 at yahoo.com> wrote:
> > If one enables hdparm DVD playback will not be
> jumpy, however when applying hdparm I get
>
> Perhaps the libata faq will give you the most basic
> answer
> http://linux-ata.org/faq.html#old_ioctls
>
> Now are you sure that the drive isn't already using
> dma by default?
>
> hdparm -i /dev/cdrom
>
> will list the supported DMA modes and will indicate
> which one is
> currently in use. By default my DVD drive has the
> most advanced DMA
> enabled by default
>
> DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2
> UDMA modes: udma0 udma1 *udma2
>
> * signifies the current active mode
[root at localhost ~]# hdparm -i /dev/cdrom
/dev/cdrom:
Model=TSSTcorpCD/DVDW SH-S182D ,
FwRev=SB03 , SerialNo=
Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs
nonMagnetic }
RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=0kB, MaxMultSect=0
(maybe): CurCHS=0/0/0, CurSects=0, LBA=yes,
LBAsects=0
IORDY=on/off, tPIO={min:227,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
AdvancedPM=no
* signifies the current active mode
[root at localhost ~]#
What is the difference between UDMA and DMA?
>
> As to why hdparm is attempting to use the legacy
> ioctls, that I have no idea.
>
> -jef
>
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>
Thank you Jeff and Todd for answering this question.
I do not know as to which option to use
add this to /etc/modprobe.conf
options libata atapi_enabled=1
or add hdc=noprobe to the kernel command
/boot/grub/grub.conf. If I do the latter where
exactly do I need to place the parameter, ie., after
quiet rhgb or before right after kernel line?
Regards,
Antonio
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