Re: If someone developed ARM DMAC driver under GPL?

[Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx>]

On Tue, Jun 03, 2008 at 04:37:19PM +0800, Yu Alex wrote:
> Hi Carlo,
> 
> Thanks for you help.
> 
> The ARM DMAC( DDI0424A3a_dmac_pl330_r0p0_trm.pdf ) is complex DMA
> controller, there is its owns instructs set, and BUS manager.
> Most  registers of  DMAC are read only for the CPU. 
> 
> DMAC can support directly address Load/Store instructs and a 16bits
> unsigned add instruction for source address/target address.
> 
> But Linux driver need communicate with DMAC while it is running,
> otherwise, the linux driver do something like a Linker, the driver
> need change the DMA instructs flow dynamically. It is difficult for
> me write a driver without demo source code.
>  
>  So, I hope I can get some  GPL  source code.
> 
> BTW,  I even think the DMAC isn't a ripe module product.

Well, it seems no one can write a driver for the ARM DMA controller -
there's been several promises of such a thing over the course of the
last three or more years, and so far precisely nothing has materialised.

I've even had promises from people within ARM Ltd which haven't resulted
in anything fruitful.

So, I myself have given up ever seeing code to drive this DMA controller.

-------------------------------------------------------------------
List admin: http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm
FAQ:        http://www.arm.linux.org.uk/mailinglists/faq.php
Etiquette:  http://www.arm.linux.org.uk/mailinglists/etiquette.php