[Sound-open-firmware] can stream-box size be 0?

[Liam Girdwood]

On Wed, 2019-04-03 at 15:33 +0200, Guennadi Liakhovetski wrote:
> Hi,
> 
> In kernel ipc.c I see "if (sdev->stream_box.size == 0)" checks at
> exactly 4 locations, but all currently supported by SOF platforms set
> the size to 0x200. Do we need those checks or can we safely assume, that
> the size is never 0?

The size can depend on FW platform and how much space they allocate for mmap()
stream position information. i.e. ALSA can read pipeline stream position stats
directly from mailbox rather than via IPC.

Liam

> 
> Thanks
> Guennadi
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