[Sound-open-firmware] How does one debug IPC errors?

[Paul Olaru]

Right now I'm still working on the ESAI SOF driver. Based on the current branch I'm getting
an out of memory issue. Solved by increasing the system runtime heap, not a real problem
even if a surprising one to me, will probably send the fix together with the ESAI driver.

However, I'm getting a second issue: Whenever I'm trying to play anything I see the etrace
log filled with "ipc: msg hdr for 0x600a0000 not found replace 0" and playback doesn't
progress. Also in another weirder circumstance (invalid aplay followed by a valid one)
I heard it play but for some reason the host buffer was copied only at odd times (and I heard
the same 64k or 16384 samples many times over instead of once).

How should I continue investigating this issue?

(also due to a failed stop - kernel reported IPC timeout for 0x60050000 and 0x60030000,
I'm still getting the issues for 0x600a0000 in a continuous loop on the firmware side, about
the time it would take to normally play those samples; until reboot I cannot send any other
commands to the DSP either).

Also, should I send the current state of the ESAI driver, even if there is a little more cleanup
that needs to be done on it? Now that I cannot reliably test it anymore.