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Re: [Qemu-devel] [RFC] QOMification of AXI stream

From: Peter Maydell
Subject: Re: [Qemu-devel] [RFC] QOMification of AXI stream
Date: Mon, 11 Jun 2012 15:53:23 +0100

On 11 June 2012 15:38, Edgar E. Iglesias <address@hidden> wrote:
> On Mon, Jun 11, 2012 at 02:39:56PM +0100, Peter Maydell wrote:
>> Ideally the interface used by DMA controllers should be identical to
>> the interface used by CPUs to talk to the rest of the system: it's
>> exactly the same bus interface in hardware, after all.
> I thought we were talking about the interface between the DMA ctrl
> and the I/O (devices). Not between the DMA and the "memory" bus system.

In hardware (at least for AXI) they're the same thing. A DMA
controller is a bus master, just like a CPU. They don't care
whether the slave is RAM or a device, they're just issuing
memory transactions to addresses.

-- PMM

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