I'm trying imx6 using Nitrogen6X board from boundary device to evaluate the multimedia capabilities of imx6, the rootfs was created by linuxlink tool from timesys.
When I use hdmi output as the audio device for gstreamer, gst-launch tool prompt the error showed below:
Playback open error on device 'hw:1,0': No such file or directory
When I check the playback hardware devices present in my board, the hdmi audio is not present as shown below:
# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sgtl5000audio [sgtl5000-audio], device 0: HiFi sgtl5000-0 
Subdevice #0: subdevice #0
But the kernel detected the hardware correctly when bootup, a portion of kernel output is shown below:
asoc: sgtl5000 <-> imx-ssi.1 mapping ok
imx_3stack asoc driver
asoc: mxc-hdmi-soc <-> imx-hdmi-soc-dai.0 mapping ok
ALSA device list:
In user space I check that devices for audio were created correctly, as shown below:
# cat /proc/asound/cards
0 [sgtl5000audio ]: - sgtl5000-audio
1 [imxhdmisoc ]: - imx-hdmi-soc
The kernel does not have any problem because I tryied with another rootfs and the hdmi audio device worked fine, but I would like to use this new rootfs which have support for many codecs.
Can someone help me to figure out what happen?