OK, here is the thing.

I bought G4 (7455) XE CPU module for my ?A1, and now when i turn my computer
on my audio start to crackle and humming.

Here is the sound http://www.mtreasure.f2s.com/jape/Recording.wav

That sound disappears when i start whatever program witch uses AHI?
When i have used my audio i can make warm reboot without that noise coming.
But if i do cold reboot, that noise starts immediatedly till that when i start
some prog witch uses AHI

So could this be somekind of "initialization" bug in UBoot?

Suggest?
I'm little lost here...

And sorry about poor quality of sound, quickly recorded with my phone.

EDIT: that noise seems to come from left channel

@jape

yes..recognize it all very well,in my case it was a faulty psu