FPGA Central

Hi!

For a small project running Linux on a Virtex2pro, I need to write an
IP-component, that recive data from portpins and can transfer data to
RAM directly.
I'm tring to understand DMA, generated by Xilinx EDK (8.2) wizzard.
I think, I've understand some basics. Afer writing the datalength in
the register, the transfer will begin. Correct?
Writing datalength, source- and destinationaddress is done by the
driver?
But how cat I write data from the user_logic to the memory?

On May 7, 1:10 pm, berton <werbu...@gmx.de> wrote:
> Hi!
>
> For a small project running Linux on a Virtex2pro, I need to write an
> IP-component, that recive data from portpins and can transfer data to
> RAM directly.
> I'm tring to understand DMA, generated by Xilinx EDK (8.2) wizzard.
> I think, I've understand some basics. Afer writing the datalength in
> the register, the transfer will begin. Correct?
> Writing datalength, source- and destinationaddress is done by the
> driver?
> But how cat I write data from the user_logic to the memory?

Hi,

What kind of developement board are you working with? Are you working
with a PCI-based dev board? I've worked with a Spartan3 dev board in
Linux and have managed to successfully achieve DMA transfers.

Best,
Ian

On 7 Mai, 22:12, idp2 <ian.pei...@gmail.com> wrote:
> On May 7, 1:10 pm, berton <werbu...@gmx.de> wrote:
>
> > Hi!
>
> > For a small project running Linux on a Virtex2pro, I need to write an
> > IP-component, that recive data from portpins and can transfer data to
> > RAM directly.
> > I'm tring to understand DMA, generated by Xilinx EDK (8.2) wizzard.
> > I think, I've understand some basics. Afer writing the datalength in
> > the register, the transfer will begin. Correct?
> > Writing datalength, source- and destinationaddress is done by the
> > driver?
> > But how cat I write data from the user_logic to the memory?
>
> Hi,
>
> What kind of developement board are you working with? Are you working
> with a PCI-based dev board? I've worked with a Spartan3 dev board in
> Linux and have managed to successfully achieve DMA transfers.
>
> Best,
> Ian

thanks for answering!
We are working with the xilinx xup v2p with a patched linux 2.6 kernel.

On May 7, 5:12 pm, berton <werbu...@gmx.de> wrote:
> On 7 Mai, 22:12, idp2 <ian.pei...@gmail.com> wrote:
>
>
>
> > On May 7, 1:10 pm, berton <werbu...@gmx.de> wrote:
>
> > > Hi!
>
> > > For a small project running Linux on a Virtex2pro, I need to write an
> > > IP-component, that recive data from portpins and can transfer data to
> > > RAM directly.
> > > I'm tring to understand DMA, generated by Xilinx EDK (8.2) wizzard.
> > > I think, I've understand some basics. Afer writing the datalength in
> > > the register, the transfer will begin. Correct?
> > > Writing datalength, source- and destinationaddress is done by the
> > > driver?
> > > But how cat I write data from the user_logic to the memory?
>
> > Hi,
>
> > What kind of developement board are you working with? Are you working
> > with a PCI-based dev board? I've worked with a Spartan3 dev board in
> > Linux and have managed to successfully achieve DMA transfers.
>
> > Best,
> > Ian
>
> thanks for answering!
> We are working with the xilinx xup v2p with a patched linux 2.6 kernel.


Have you looked at this yet? It has a pretty good section on reading
and writing to RAM that should answer most of your questions.

Ian

On 8 Mai, 03:49, idp2 <ian.pei...@gmail.com> wrote:
> On May 7, 5:12 pm, berton <werbu...@gmx.de> wrote:
>
> > On 7 Mai, 22:12, idp2 <ian.pei...@gmail.com> wrote:
>
> > > On May 7, 1:10 pm, berton <werbu...@gmx.de> wrote:
>
> > > > Hi!
>
> > > > For a small project running Linux on a Virtex2pro, I need to write an
> > > > IP-component, that recive data from portpins and can transfer data to
> > > > RAM directly.
> > > > I'm tring to understand DMA, generated by Xilinx EDK (8.2) wizzard.
> > > > I think, I've understand some basics. Afer writing the datalength in
> > > > the register, the transfer will begin. Correct?
> > > > Writing datalength, source- and destinationaddress is done by the
> > > > driver?
> > > > But how cat I write data from the user_logic to the memory?
>
> > > Hi,
>
> > > What kind of developement board are you working with? Are you working
> > > with a PCI-based dev board? I've worked with a Spartan3 dev board in
> > > Linux and have managed to successfully achieve DMA transfers.
>
> > > Best,
> > > Ian
>
> > thanks for answering!
> > We are working with the xilinx xup v2p with a patched linux 2.6 kernel.
>
> Have you looked at this yet? It has a pretty good section on reading
> and writing to RAM that should answer most of your questions.
>
> Ian

sorry, what you mean exact?