[QUESTION] MPC834x DMA Support

[QUESTION] MPC834x DMA Support

[KRONSTORFER Horst]

hi!

does anyone know if the mpc834x's dma unit supports dma operation
only between pci and csb or also between csb and csb, f.e. devices
connected via the lbc (f.e. ram and a dsp)?

thanks
-h

Re: [QUESTION] MPC834x DMA Support

[Kumar Gala]

On Apr 27, 2006, at 5:37 AM, KRONSTORFER Horst wrote:

> hi!
>
> does anyone know if the mpc834x's dma unit supports dma operation
> only between pci and csb or also between csb and csb, f.e. devices
> connected via the lbc (f.e. ram and a dsp)?

You should be able to do csb to csb devices.

- kumar

Re: [QUESTION] MPC834x DMA Support

[Wolfgang Denk]

In message <C5BA91F04186584EB68FD42BB4993E6BC1B5C6@FRQWOLEX01.frequentis.frq> you wrote:
> 
> does anyone know if the mpc834x's dma unit supports dma operation
> only between pci and csb or also between csb and csb, f.e. devices
> connected via the lbc (f.e. ram and a dsp)?

This should work. We used this  to  initialize  ECC  memory.  But  be
careful  about your performance expectations - ask Freescale what you
can get out of memory to memory DMA. [Sorry, I'm  still  waiting  for
replies from FSL myself.]

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
You speak of courage. Obviously you do not know the  difference  bet-
ween  courage and foolhardiness. Always it is the brave ones who die,
the soldiers.
	-- Kor, the Klingon Commander, "Errand of Mercy",
	   stardate 3201.7

RE: [QUESTION] MPC834x DMA Support

[KRONSTORFER Horst]

> -----Original Message-----
> From: Kumar Gala [mailto:galak@kernel.crashing.org]=20
> Sent: Donnerstag, 27. April 2006 17:25
> To: KRONSTORFER Horst
> Cc: linuxppc-dev@ozlabs.org
> Subject: Re: [QUESTION] MPC834x DMA Support
>=20
>=20
> On Apr 27, 2006, at 5:37 AM, KRONSTORFER Horst wrote:
>=20
> > hi!
> >
> > does anyone know if the mpc834x's dma unit supports dma=20
> operation only=20
> > between pci and csb or also between csb and csb, f.e. devices=20
> > connected via the lbc (f.e. ram and a dsp)?
>=20
> You should be able to do csb to csb devices.

thanks for the hint!

-h

>=20
> - kumar
>=20

RE: [QUESTION] MPC834x DMA Support

[KRONSTORFER Horst]

> -----Original Message-----
> From: wd@denx.de [mailto:wd@denx.de]=20
> Sent: Donnerstag, 27. April 2006 18:28
> To: KRONSTORFER Horst
> Cc: linuxppc-dev@ozlabs.org
> Subject: Re: [QUESTION] MPC834x DMA Support=20
>=20
> In message=20
> <C5BA91F04186584EB68FD42BB4993E6BC1B5C6@FRQWOLEX01.frequentis.
> frq> you wrote:
> >=20
> > does anyone know if the mpc834x's dma unit supports dma=20
> operation only=20
> > between pci and csb or also between csb and csb, f.e. devices=20
> > connected via the lbc (f.e. ram and a dsp)?
>=20
> This should work. We used this  to  initialize  ECC  memory. =20
> But  be careful  about your performance expectations - ask=20
> Freescale what you can get out of memory to memory DMA.=20
> [Sorry, I'm  still  waiting  for replies from FSL myself.]
>

thanks for the hints!

-h
=20
> Best regards,
>=20
> Wolfgang Denk
>=20
> --
> Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email:=20
> wd@denx.de You speak of courage. Obviously you do not know=20
> the  difference  bet- ween  courage and foolhardiness. Always=20
> it is the brave ones who die, the soldiers.
> 	-- Kor, the Klingon Commander, "Errand of Mercy",
> 	   stardate 3201.7
>=20