[ELDK] PPC 44x DMA controller

[Dave Cogley]

The old "ppc" architecture in Linux used to support several useful
libraries that do not appear to have the functionality supported in the
newer "powerpc" branch. 

I am looking for equivalent built in support of the PPC4xx DMA libraries
that used to be supported under "ppc/syslib"; ppc4xx_dma.c and
ppc_sgdma.c. The ELDK is currently using these libraries to support the
OTG USB controller on the Canyonlands board. These libraries however are
currently not built into the mainstream kernel as the should be.

I have already made the jump to mainstream Linux in my design and am
running with 2.6.30. I was offering to port said libraries into a
standard Linux format supporting the PPC4xx arch. In the interim I was
able to compile the support directly into my device driver and
everything appears to work with the exception of dma_alloc_coherant
which is causing a kernel oops. 

Dave Cogley
`
On Tue, 2009-06-30 at 16:22 +0200, Detlev Zundel wrote:
> Hi Dave,
> 
> > Are there any plans to port the PPC44x EDMA controller syslib over to
> > the powerpc branch in ELDK Linux?
> 
> I don't quite understand this question - can you be more precise about
> what you want?  What is the "powerpc branch in ELDK Linux" meant to be?
> We keep our linux-2.6-denx repo[1] pretty close to mainline Linux so
> everything in mainline will show up there soon also.
> 
> Maybe you simply want to use a newer Linux kernel with ELDK, which is -
> to be honest - the norm rather than the exception.  Usually people will
> use the ELDK provided kernel only for very early testing before moving
> on to current development versions.  Feel free to use our git repo for
> this purpose.
> 
> > Where would be a good place to start for implementing a port to the
> > new Linux branch?
> 
> I'm not even sure we need to port anything ;)
> 
> Cheers
>   Detlev
> 
> [1] http://git.denx.de/?p=linux-2.6-denx.git;a=summary
>