[Sound-open-firmware] Zephyr memory allocation from heap

[Girdwood, Liam R]

On Mon, 2022-08-22 at 16:44 +0000, Daniel Baluta wrote:
> + andyross at google.com
> 
> 
> Subject: Re: [Sound-open-firmware] Zephyr memory allocation from
> heap 
> + Andy, as he also worked on the initial zephyr with SOF.
> 
> On Mon, Aug 22, 2022 at 5:04 PM Daniel Baluta
> <daniel.baluta at gmail.com> wrote:
> > 
> > Hi guys,
> > 
> > Did you encountered any problems with memory allocations when
> > switching to Zephyr?
> > 
> > I'm facing a very strange issue with a playback pipeline with
> > module
> > adapter (MP3) where
> > it looks like the DAI hits underruns as soon as I start the
> > pipeline.
> > 
> > With normal PCM playback everything works fine.
> > 
> > I think it might be a problem in the sense Zephyr allocates memory
> > and/or Cadence
> > memory alignment requirements?
> > 
> > Looks like as soon as I change this:
> > 
> > -#define PLATFORM_DCACHE_ALIGN  sizeof(void *)
> > +#define PLATFORM_DCACHE_ALIGN  32
> > 
> > 
> > everything seems to work.
> > 
> > But I cannot find any logical explanation.
> 
> 
The cache line size should align to the value in core-isa.h. 

IIRC, I think the sizeof(void*) is a catch all when its not defined.

Liam