Hi,
Can you recommend any documentation about CPU--GPU interactions as they happen in assembly-language level? Traditionally the communication goes via the system bus (such as PCI Express) but these APU/HSA systems those are obviously more tightly bound -- yet I guess the driver interfaces are designed to provide uniform access to the graphics subsystem for both cases.
Anyway, the point is to get the low-level info, minimizing any obscuring software layers over the hardware.
Thanking for any constructive hints,
Vesa