Re: [Qemu-devel] [PATCH v5 00/11] fw_cfg, bootorder, and UEFI+'-kernel' on arm/virt

[Alexander Graf]

On 19.12.14 10:39, Gerd Hoffmann wrote:
>   Hi,
> 
> Attached is a patch drafting a dma interface for fw_cfg, lousily based
> on the ideas I've outlined a few days ago on this list.  Applies on top
> of this patch series.
> 
> Host side only, unfinished, untested.  Mainly sending this out as
> notification that I've looked into this, to avoid duplicating work.
> I'll go disappear into xmas vacation in a few hours and will not
> continue with this until next year.
> 
> My plan is to coordinate in January with Laszlo how to go forward.  If
> someone feels bored during the holidays feel free to grab it and run
> with it.

Nice first draft :).

The major thing I would do differently is the way to access the DMA
registers. Instead of making them even more PIO/MMIO ports, I'd rather
just make them one big 256 bit fw_cfg entry. That way we don't need to
modify (and synchronize) any machine port layout to support DMA.


Alex