Something

Oct 26 11:30:32 c7x0 user.info kernel: WM8731 PCM Codec <-> pxa2xx-i2s info:
Oct 26 11:30:32 c7x0 user.info kernel: rates ca n
Oct 26 11:30:32 c7x0 user.warn kernel: min ch 2 max ch 2
Oct 26 11:30:32 c7x0 user.warn kernel: min rate 8000 max rate 48000
Oct 26 11:30:32 c7x0 user.warn kernel: wm8731: Writing 0 to 6
Oct 26 11:30:32 c7x0 user.info kernel: codec rate 8000 fs 64 format 81000001
Oct 26 11:30:32 c7x0 user.info kernel: iface rate 8000 fs 64 format 81000001
Oct 26 11:30:32 c7x0 user.info kernel: audio rate 8000 chn 2
Oct 26 11:30:32 c7x0 user.warn kernel: hw sub rate 8000 chn 2
Oct 26 11:30:32 c7x0 user.warn kernel: wm8731: Writing 0 to 9
Oct 26 11:30:32 c7x0 user.warn kernel: wm8731: Writing c to 8
Oct 26 11:30:32 c7x0 user.warn kernel: wm8731: Writing 2 to 7
Oct 26 11:30:32 c7x0 user.warn kernel: wm8731: Writing 12 to 4
Oct 26 11:30:32 c7x0 user.warn kernel: wm8731: Writing 1 to 9
Oct 26 11:30:37 c7x0 user.warn kernel: wm8731: Writing f0 to 6

root@c7x0:/media/card/wave# aplay 8000m.wav
Playing WAVE '8000m.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono