RE: MPC8541E DMA transfer

Hi Clemens,
Thanks for the code, the processor I am using is MPC8541E which I
believe have the same DMA engine as mpc8540. I will try it and will let
you know how it worked.

Thanks,
Bizhan=20

-----Original Message-----
From: Clemens Koller [mailto:clemens.koller@anagramm.de]=20
Sent: Thursday, August 04, 2005 5:13 AM
To: Bizhan Gholikhamseh (bgholikh)
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: MPC8541E DMA transfer

Hello, Bizhan!
and all the other mpc85xx DMA fans.

I am working on the mpc85xx dma stuff (based on Jason's work) on the
lastest 2.6.x kernels. My cpu is a mpc8540.
That's all work in progress, so have a look at the code.

Attached you will find some of my test code (a separate kernal module)
which should compile fine for 2.6 now. Make a symlink ~/linux to the
latest 2.6 kernel or change the makefile. There is also the latest
immap_85xx.h (almost complete) included. Some old code is commented
out...

Not all code is enabled in the module yet, and the dma_test routine
copys data from physical memory you might not have in your hardware.
Please change that according to your setup.

Feedback is welcome!

Enjoy!

Clemens Koller
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Bizhan Gholikhamseh (bgholikh) wrote:

Is there any support in Linux 2.6.X for using this controller, if so,=20
are you aware of any test driver I can take a look at?
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Thanks,
Bizhan
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Many thanks in
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-----Original Message-----
From: Kumar Gala [mailto:kumar.gala@freescale.com]
Sent: Wednesday, August 03, 2005 11:24 AM
To: Bizhan Gholikhamseh (bgholikh)
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: MPC8541E DMA transfer
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I dont see any reason you couldn't use the internal DMA engine on the=20
MPC8541E to do what you need.  You will just need to schedule the work

every 10ms.
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- kumar
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On Aug 3, 2005, at 10:04 AM, Bizhan Gholikhamseh \(((bgholikh\)))

wrote:

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quoted

Hi all,
I am developing a linux driver (2.6.10) for Freescale MPC8541E=20
(customized board) to read and write 8 buffers (each buffer is 960=20
bytes
long) every 10 ms to/from a custom made PCI card with on board DSP=20
Chip.
The chip's internal and external memories are memory mapped to the CPU

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=20

quoted

address space.
For reason that is beyond the discussion here, the DMA request line on

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quoted

the PCI card is not connected although the PCI card has DMA=20
capabilities.
So what are my options?
Could I still do DMA transfer from the Host to the device?

Many thanks in advance,
Bizhan

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