(I'm cross-posting this to the linux-arm-kernel and alsa-devel lists, as recommended):

I'm looking for anyone who has successfully used the EP93XX/EDB9315A demo board's sound infrastructure. I have been working with Hartley Sweeten on patching some DMA coherency mask issues (successfully), and while this makes the kernel stop complaining (and allows the userspace to "appear" to work) I never actually get any sound out of the machine on newer kernels.

I do, however, have an existing (binary-only) 2.6.21 kernel from the client where sound _IS_ functional; thus, I know the system can POTENTIALLY work, and that the problem is software-based.

At this point, I have a mountain of information I can provide about the state of my EDB9315A board, but what I'm really looking for is someone to connect with and/or have consult with us to get sound working on newer kernels with this board exactly (although other EP93XX boards might be similar, I'm so mistrustful of everything at this point I'm looking for someone else with this hardware EXACTLY).

I've tried 3.15-3.17, all with the same results. aplay/alsamixer see the device, appear to interact with it in a normal fashion (it even mutes/unmutes the device every time you touch it), but no sound is ever produced. It is possible, of course, the problem is in userspace (I'm using a custom Yocto-based image), but I'm doubtful of that.

At any rate, any help would be greatly appreciate, although i realize this is fringe hardware. :)