> Could it be that some disks don't work with DMA on?
Not all compact flash supports DMA
>> I wonder why there is a command to turn on DMA on disks. Could
>> it be that some disks don't work with DMA on?
>
> sure. it's PC hardware, so it's crap :-)
> ron
the ata spec does not require dma for pata devices.
sata, first specified in ata 7, requires udma mode 5,
though sata:pata bridges
> > I wonder why there is a command to turn on DMA on disks. Could
> > it be that some disks don't work with DMA on?
> sure. it's PC hardware, so it's crap :-)
unfortunately, this isn't a pc hardware thing. pata
devices are not required to support dma. ata 7, which
is the first to include sata
On Tue, Aug 5, 2008 at 11:16 AM, Sape Mullender
<[EMAIL PROTECTED]> wrote:
> I wonder why there is a command to turn on DMA on disks. Could
> it be that some disks don't work with DMA on?
sure. it's PC hardware, so it's crap :-)
ron
I wonder why there is a command to turn on DMA on disks. Could
it be that some disks don't work with DMA on?
Sape
--- Begin Message ---
Ran into an interesting one setting up my cpu server. The following
reliably freezes the box:
# echo dma on >/dev/sdC0/ctl
# 9fat:
Leaves the console
Ran into an interesting one setting up my cpu server. The following
reliably freezes the box:
# echo dma on >/dev/sdC0/ctl
# 9fat:
Leaves the console totally unresponsive, no ^T^Tp, no ^P. rc -x on
9fat: gives "rfork e" as the final command.
sdC0 is a cdrom. I can turn dma on for my sata disks
