Re: [PATCH v4] QEMU fw_cfg DMA interface documentation

[Stefan Hajnoczi]

On Mon, Oct 5, 2015 at 11:06 AM, Marc Marà <markmb@xxxxxxxxxx> wrote:
> On Mon, 5 Oct 2015 09:20:55 +0100
> Stefan Hajnoczi <stefanha@xxxxxxxxx> wrote:
>
>> On Thu, Oct 1, 2015 at 1:15 PM, Marc Marà <markmb@xxxxxxxxxx> wrote:
>> > +Additionaly, if the DMA interface is available then a read to the
>> > DMA Address +will return 0x51454d5520434647 ("QEMU CFG" in
>> > big-endian format).
>>
>> What does this mean?
>>
>
> https://www.mail-archive.com/qemu-devel@xxxxxxxxxx/msg325546.html
>
> Proposed by Kevin O'Connor in v3.
>
> (I could not find this thread in gnu.org or gmane archives. It's
> strange).

The following is clearer to me:

If the DMA interface is available, then reading the DMA Address
Register returns 0x51454d5520434647 ("QEMU CFG" in big-endian format).

Stefan
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