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I've gathered some level of knowledge on several components (including software and hardware) which are involved in general DMA transactions in ARM based boards, but I don't understand how is it all perfectly integrated, I didn't find a full coherent description about this. I'll write down the high level of the knowledge I already have and I hope that someone could fix me where I'm wrong and complete the missing parts so the whole picture would be clear. My description starts with the userspace software and drills down to the hardware components. The misunderstood parts are in italic-bold

I will first say that I'm not expert in the field and my question might contain misunderstanding, in which case, I'll be glad if you correct me and attach resources so I can learn further details. I'm trying to figure out the way that the system bus and how the various devices that appear in a mobile device (such as sensors chips, wifi/BT SoC, touch panel, etc.) are addressed by the CPU (and by other MCUs). In the PC world we have the bus arbitrator that route the commands/data to the devices, and, afaik, the addresses are hardwired on the board (correct me if I'm wrong). However, in the