On Wednesday 04 November 2009 02:37:38 Jonathan Haws wrote:
> All,
>
> I have what may be an unconventional question:
>
> Our application consists of data being captured by an FPGA, processed, and
> transferred to SDRAM. I simply give the FPGA an address of where I want
> it stored in SDRAM an
On 11/04/2009 11:50 AM, Jonathan Haws wrote:
> One more question about this approach: does the mmap() call prevent
> the kernel from using this memory for other purposes? Will the
> kernel be able to "move" this memory elsewhere? I guess what I am
> asking is if this memory is locked for all oth
ginal Message-
From: linuxppc-dev-bounces+john.p.price=l-3com@lists.ozlabs.org
[mailto:linuxppc-dev-bounces+john.p.price=l-3com@lists.ozlabs.org]
On Behalf Of Jonathan Haws
Sent: Wednesday, November 04, 2009 12:40 PM
To: bo@windriver.com
Cc: linuxppc-dev@lists.ozlabs.org
Subject: RE: D
> 1. I open /dev/mem and get a file descriptor
> 2. I use mmap to reserve some physical addresses for my buffers in
> user space.
> 3. I give that address to the FPGA for DMA use.
> 4. When I get the FPGA interrupt, I invalidate the data cache and
> write the data to disk
>
> Does that sound like
> Jonathan Haws wrote:
> > All,
> >
> > I have what may be an unconventional question:
> >
> > Our application consists of data being captured by an FPGA,
> processed, and transferred to SDRAM. I simply give the FPGA an
> address of where I want it stored in SDRAM and it simply DMAs the
> data ove
Jonathan Haws wrote:
All,
I have what may be an unconventional question:
Our application consists of data being captured by an FPGA, processed, and
transferred to SDRAM. I simply give the FPGA an address of where I want it
stored in SDRAM and it simply DMAs the data over and interrupts me wh
