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On Tue, Jan 13, 2004 at 10:35:34AM +0100, Jochen Kunz wrote:
> On Mon, 12 Jan 2004 19:33:13 -0800
> "Viswanath" <viswamys@fastmail.fm> wrote:
>=20
> > For your previous mail suggesting for the bus_dma independent
> > framework for DMA to be used. I'm writing the DMA machine dependent
> > code for On-chip DMA for SIO(serial interface) on tx4937 board. Need
> > to have some tips as to how the implementation is done.
> The device specific part of DMA is done in the device driver, not
> bus_dma(9). bus_dma(9) provides only the infrastructure that a device
> driver needs to do the actual DMA transactions. Have a look at existing
> drivers and possibly the "NetBSD Device Driver Writing Guide". (See
> links in the documentation section on the NetBSD web site.)

Additionally, look at Jason Thorpe's paper about the bus_dma framework
design, e.g. in src/share/doc/papers/bus_dma in your source tree.

Regards,
	-is




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