Re: [PATCH v9 0/7] FPGA Manager Framework and Simple FPGA Bus

atull
2015-07-22T20:32:32Z

On Fri, 17 Jul 2015, atull wrote:

> On Fri, 17 Jul 2015, Jason Gunthorpe wrote:
>
> > On Fri, Jul 17, 2015 at 10:51:10AM -0500, atull@opensource.altera.com wrote:
> > > From: Alan Tull <atull@opensource.altera.com>
> > >
> > > This patchset adds two chunks plus documentation:
> > > * fpga manager core: exports ABI functions that write an image to a FPGA
> > > * DT Overlay support: simple-fpga-bus to handle FPGA from a DT overlay
> >
> > I didn't read super closely, but overall it makes sense to me..
> >
> > Providing an in-kernel API will let someone else figure out how to
> > expose that to user space. The DT based scheme seems pretty nice.
> >
>
> Thanks!
>
> > Can you use this without DT overlay? Ie if I provide the FGPA
> > description as part of my boot time DT will it just work?
>
> The simple fpga bus would need to defer probing until after the fpga
> manager driver and bridge drivers are probed (that's easy). Since it is
> using firmware, it will also have to defer until the filesystem is
> available so it can get the fpga image to load. I'll work on it.
>
> Alan

I looked some more; I don't see a simple way of deferring probing until
after the filesystem is loaded (so that the image file would be
available), late_initcall is still not late enough.

Alan

>
> >
> > Jason
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