iav-hd: video 编解码硬件加速, 帮助motion estimation, 熵编码/解码等
coretex m3: for simcop control/ display subsystem
diplay sub: hdmi/ntsc/pal, multi-display channel(video/gfx)
abe sub: audio mix, postprocess(sample rate convert, volume control)
iss: isp(white baance, auto focus, etc), resizer, sensor process and interfce, simcop(rotate, dct, jpeg enc/dec, etc)