Jarkko-

Quick update.
I was able to recompile the distribution kernel after a long wait, and 
with the changes that were made I was able to get some semblance of an 
audio device registered.

I've attached the dmesg.

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: bytrt5640 [byt-rt5640], device 0: Audio rt5640-aif1-0 []
   Subdevices: 1/1
   Subdevice #0: subdevice #0

I've also attached a screenshot of what I am seeing.
No HDMI audio though, and when I attach a headphone to the speaker 
jack... I get nothing but very faint buzzing when I put my ear to it and 
hit 'test sound'

Thanks-

Tyler


On 06/25/2015 02:38 AM, Jarkko Nikula wrote:
> On 06/24/2015 07:03 PM, Vinod Koul wrote:
>> On Wed, Jun 24, 2015 at 10:24:54AM -0400, Tyler Yeomans wrote:
>>> Vinod,
>>>
>>> Thank you for looking into this.
>>> I have attached the dmesg for this device.
>>> Please note I have tried kernels 3.16/19 4.0 and 4.1, all with same 
>>> result.
>>> The attached dmesg file is from booting kernel 4.1/amd64:
>>> Linux mykro 4.1.0-040100-generic #201506220235 SMP Mon Jun 22
>>> 06:36:19 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
>>> On Ubuntu 15.04
>> I can see these errors:
>> [    6.012196] (NULL device *): ipc: error DSP boot timeout
>> [    6.012386] byt-rt5640 byt-rt5640: ASoC: CPU DAI 
>> baytrail-pcm-audio not
>> registered
>>
>> Jarrko, can you see why DSP boot fails, perhpas some resources are
>> missing/wrong
>>
> Very likely BIOS defines the DSP-host interrupt in another index what 
> code is using currently. Could you try does changing irqindex_host_ipc 
> from 5 to 0 help? Like how it is done here:
>
> http://mailman.alsa-project.org/pipermail/alsa-devel/2015-June/093129.html 
>
>