[Sound-open-firmware] Design document - topology, scheduling et all

[Pierre-Louis Bossart]

On 2/11/19 2:58 PM, Daniel Baluta wrote:
> Hi all,
>
> First of all I'm now in the phase where I only need to implement the DMA driver
> for i.MX and create the topology file.
>
> Few questions:
>
> 1) Is there any simple scenario (topology file) where I could test
> that scheduling,
> ipc, pipelines, etc works without the DMA?

DMA is a loaded term for intel folks, depending on the skews we use 
either the same DMA controller for host memory <-> internal DSP memory 
and internal memory <-> audio peripherals.

Are you missing the first, the second or both? the information would 
help provide guidance on what topologies you can try to use.


> It is my first time using topology and I'm still yet to get around the
> m4 topology description.
In simple cases it may be easier to work directly with an alsaconf 
format. M4 is mostly there for reuse of configurations, it's not always 
readable or concise...
>
> 2) Is there any design document for the SOF architecture. I'm still
> yet to understand
> how components and scheduler interact.
Mostly by the definition of priorities and rates.