[techtalk] hdparm and DMA "not permitted"

[Conor Daly]

On Sun, May 20, 2001 at 12:17:18PM +0100 or so it is rumoured hereabouts, 
James Sutherland thought:
> On Sun, 20 May 2001, Conor Daly wrote:
> 
> > Little problem here with hdparm and DMA.  I'm using an AMD K6-2 350MHz on
> > some kind of amibios mobo with "Ultra DMA Enabled" in CMOS but I cannot
> > set "using dma" for the drive(s).
> >
> > [root]# /sbin/hdparm -d 1 /dev/hda
> >
> > /dev/hda:
> >  setting using_dma to 1 (on)
> >  HDIO_SET_DMA failed: Operation not permitted
> >  using_dma    =  0 (off)
> >
> >
> > dmesg returns:
> >
> > PCI_IDE: unknown IDE controller on PCI bus 00 device 78, VID=10b9,
> > DID=5229
> > PCI_IDE: not 100% native mode: will probe irqs later
> > PCI_IDE: simplex device:  DMA disabled
> > hda: Maxtor 91021U2, 9770MB w/512kB Cache, CHS=1245/255/63
> > hdb: FUJITSU MPD3084AT, 8063MB w/512kB Cache, CHS=1027/255/63
> >
> > Any thoughts?
> 
> Enabling DMA requires the right driver in the kernel; there is an option
> for "Generic PCI DMA support" or similar, which might be worth a try if
> you can't find an exact match for your IDE chipset.
> 
> What does /proc/pci have to say about your IDE controller? This should
> tell you which driver to use - then just recompile, reboot, and you have
> DMA...

/proc/pci has this to say...

  Bus  0, device  15, function  0:
    IDE interface: Acer Labs M5229 TXpro (rev 193).
      Medium devsel.  Fast back-to-back capable.  Master Capable.
Latency=32.  Min Gnt=2.Max Lat=4.
      I/O at 0xffa0 [0xffa1].

will poke around the kernel and see what I come up with.

Somebody else said something about

###########################
hda: Maxtor 91021U2, ATA DISK drive
hdb: FUJITSU MPD3084AT, ATA DISK drive                                                                      

Longshot here, but wasn't there at one stage a fairly serious problem
with these makes of drive interoperating on the same IDE controller?
###########################

Anyone know anything about that?  I haven't had any issues myself with
these two drives.

Conor
-- 
Conor Daly <conor.daly at oceanfree.net>

Domestic Sysadmin :-)
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