The PackeTwin board has DMA 0-3 available, since most soundcards us 1
and 3 that leaves 0. I forget what DMA 2 was being used for. The serial
sync port runs in non-interupt DMA mode. Don't forget to change the
NRZI=1 for the serial sync port.
As I mentioned in a earlier post, I am using the RH 6.0 package with the
2.2.5-22 kernel which has the dmascc drivers built right in as a network
interface. Works fine..Lasts longtime.
I did experience a problem with trying to configure Port B for RS-422
(even though the manual stated that it was possible).
John
Gerd wrote:
> Hello Rommel Voncente Torres T., hello all,
>
> > I have setup AX25 and PackeTwin in my Linux BOX but when start I
> > obtained this messages:
> >
> > PT: Probing for card at address 0x300
> > PT: Found a PT at address 0x300
> > PT: Autodetected IRQ 3, assuming DMA 0
>
> That seems to be the problem. Is it really DMA 0 (this is unusual)?
> I'd recommend trying different DMA settings.
>
> > PT: pt_tmrisr() Invalid tstate 0 for Channel A
> >
> >
> > I have Linux Slackware 3.5 whit kernel 2.0.34
>
> Then you have the older set of AX.25 drivers. You then either have
> to apply the AX.25 modules patch to get a more recent version of
> the drivers (see the AX.25-HOWTO for this - but it is not
> recommended any more) or switch to a kernel 2.0.35, 2.0.36 or
> 2.0.37 (here those modules and drivers are included already).
>
> [config files snipped]
>
> I'd recommend upgrading the drivers first and then reading the
> readme for the PacketTwin driver to find out how to give that driver
> the right DMA channel.
>
> Cheers, 73
>
> Gerd
