Comment 28 for bug 420447

Debugging using fsl rootfs, I see the audio work as a module just fine. I get these messages when it loads:

root@freescale ~$ modprobe -V snd-soc-imx-3stack-sgtl5000
sgtl5000-i2c 1-000a: SGTL5000 revision 17
DMA Sound Buffers Allocated:UseIram=1 buf->addr=1ffef000 buf->area=de9a0000 size=24576
DMA Sound Buffers Allocated:UseIram=1 buf->addr=ac468000 buf->area=fbe08000 size=24576
asoc: SGTL5000 <-> imx-ssi-3 mapping ok

Check using 'lsmod' to make sure all the modules got loaded:

root@freescale ~$ lsmod
Module Size Used by
snd_soc_imx_3stack_sgtl5000 8320 0
snd_soc_imx 6600 1 snd_soc_imx_3stack_sgtl5000
snd_soc_imx_ssi 6288 1 snd_soc_imx_3stack_sgtl5000
snd_soc_sgtl5000 13356 1 snd_soc_imx_3stack_sgtl5000
snd_soc_core 48040 3 snd_soc_imx_3stack_sgtl5000,snd_soc_imx,snd_soc_sgtl5000
snd_pcm 78545 3 snd_soc_imx,snd_soc_sgtl5000,snd_soc_core
snd_page_alloc 7588 1 snd_pcm
snd_timer 22332 1 snd_pcm
snd 55188 4 snd_soc_imx_3stack_sgtl5000,snd_soc_core,snd_pcm,snd_timer
soundcore 8168 1 snd

So I suggest that you do 'lsmod' to make sure all the modules got loaded. If they did, then it is rootfs issues.