Andy Polyakov <appro@fy.chalmers.se> wrote:
> On a side note for reference.
>
> >> My system is loaded with one of the newer versions of solaris 10
> >> $ uname -a
> >> SunOS my_machine 5.10 Generic_139555-08 sun4u sparc sun4u
> >
> >
> > Note that Solaris 10 in general does not by default enable DMA
>
> It's natural to expect that "Solaris 10 in general" covers x86, isn't?
> Quoting 'man ata' from Solaris 10:
>
> Direct Memory Access (DMA) and PCI-IDE Systems
> Direct Memory Access is enabled by default. To disable DMA
> ...
>
> > but you need it
> > for writing. See eeprom(1)
>
> eeprom(1) manual page contains no mention of DMA.
>
> > Note that Solaris sparc still does not support DMA on ATA interfaces.
>
> It's natural to expect that "still" means from oldest SPARC Solaris
> implementing support for IDE through latest, isn't it? Well, I can't
> speak for oldest and latest ones, but otherwise SPARC Solaris is capable
> of DMA on ATA interfaces to my knowledge. Negotiated value is reflected
> in targetN-dcd-options in prtconf -v output. Value of 0x000000a2 is
> common for optical media units and denotes UDMA-2 mode. A.
I am not sure about what you are interested in....
The last time I checked Solaris on sparc, I was unable to write a DVD because
of the lack of DMA support for ATA. Note that in order to be able to enable
burnproof, most drives require DMA to be enabled too.
Jörg
--
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