On Mon, Sep 9, 2013 at 2:57 PM, Thierry Reding <thierry.reding@xxxxxxxxx> wrote:
> If I understand correctly, the way that the services should be announced
> is via RSC_VDEV entries in the resource table?
Yes.
> Looking at the remoteproc core and ELF loader, it seems like the way to
> pass in the resource table is either via an extra ELF section or driver
> specific. TI drivers seem to use ELF, but the STE modem driver seems to
> employ some custom format.
>
> From what I understand this resource table can also be processed by the
> host to provide some of the resources such as carveout memory. So that
> the normal way for this to work would be something like:
>
> - load firmware image
> - obtain pointer to resource table
> - process resource table
> - allocate resources
> - update table
> - upload firmware to remote processor
>
> Upon which the remote processor probably needs to parse the resource
> table to set itself up. Does that sound about right?
Yeah, it generally does.
> > The way we were planning to add static channels functionality (I
> > should still have preliminary patches doing this somewhere but the
> > entire work was put on hold since TI changed its focus) is by
> > statically publishing them in the resource table, which is coupled
> > with a specific remote image.
>
> While I see that the format of all this is pretty well documented, are
> there any standard tools that can be used to embed the resource table
> into an ELF binary?
I'm not aware of any.
> I have a pretty good idea on how it could be done,
> but I wonder if it might make sense to provide some kind of a standard
> set of headers to make things easier so that not everyone has to
> reinvent the wheel.
>
> Looking at the remoteproc core, it seems that there's no direct way to
> change the firmware running on a remoteproc at runtime.
One way is to unload and load the driver, but you can also use the
bind/unbind sysfs files of your driver (echo -n device-name >
/sys/..../{un}bind).
Does that help?
Best,
Ohad.
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