Xenos

As you probably already know, I added support for Jasper EDRAM init in libxenon not long ago.

Next was adding support for more display resolutions. To add one in libxenon, you basically need 2 things: one ana chip registers dump and one xenos GPU registers dump. From the GPU dumps, you can guess video timings. So you add those timings to libxenon along with the ana dump and I thought it was supposed to work.
It turns out it wasn't that easy, you have to edit ana dumps a bit before they work in libxenon. I had to do some reverse engineering on the official kernel to find out exactly how.
Anyway I was able to add 1280x720, 1440x900 and 1280x1024 (all VGA). 1440x900 is rendered as 1440x896 because EDRAM isn't big enough to render it. This is the highest resolution I can add for now because unlike the official games, libxenon doesn't render 3d as 1280x720 and then scale it up, instead it renders to the native resolution directly.

Next was adding HDMI support. I quickly had an idea for this: logging I2C/SMbus and GPIOs accesses inside an official kernel (I thought that was the 3 ways of talking to HDMI hardware). I need to thank cOz for doing the kernel patching and logging. From those logs I was able to guess which registers I needed to write to activate HDMI output.

So we now have jasper support, HDMI, and more available resolutions in libxenon :)

Now I think I'll work on updating Xell a bit, so my next post will probably be about it.