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 give your direct access to the device through service like 
Teamviewer if need be.

Again, thank you for looking into this.

Tyler

On 06/24/2015 06:11 AM, Vinod Koul wrote:
> On Tue, Jun 23, 2015 at 05:31:17PM -0400, Tyler Yeomans wrote:
>> Hello Vinod,
> Pls cc relevant mailing list, in this case alsa. I have cced Liam and Jarrko
> as well
>> I am writing to you because unfortunately I have exhausted my search
>> and I am unable to get ALSA sound working on my Baytrail minipc.
>> My dmesg only reports that: byt-rt5640 byt-rt5640: ASoC: CPU DAI
>> baytrail-pcm-audio not registered
>> aplay -l rightfully says there are no sound cards as the driver is
>> not registered.
> Can you give more details of your, does this enable HDA audio or I2S audio?
>
>> I have acquired the firmware file from the chromium repo here (https://kernel.googlesource.com/pub/scm/linux/kernel/git/firmware/linux-firmware/+/refs/heads/master/intel/fw_sst_0f28.bin-48kHz_i2s_master)
>> as was directed by the OP in this forum post:
>> http://ubuntuforums.org/showthread.php?t=2254631
>>
>> But unfortunately it seems the driver is still not loading
>> correctly, even on Ubuntu 15.04 with ALSA 1.0.28
> Do you have dmesg for us to look at so that we can see what might be going
> wrong
>
>> I see on gmane you are working on Skylake driver, could your work
>> there possibly be backported to the Baytrail/RT5640 chipset?
> No they are entirely different hw, so it will not work. We have uostream BYT
> driver and they should work
>