[U-Boot] [PATCH 10/10] ARM: socfpga: arria10: add support for building Arria10

Marek Vasut
2015-11-23T22:46:41Z

On Monday, November 23, 2015 at 11:32:27 PM, Dinh Nguyen wrote:
[...]
> >>>> The main point is that we need to program the FPGA
> >>>> during U-Boot booting up with a ~>10 MB rbf file while being limited
> >>>> to the OCRAM's size. I would like to contain this ugliness in it's
> >>>> own directory.
> >>>
> >>> What's the problem with this ? We already support loading files from
> >>> storage in SPL, so just compile the FPGA manager into SPL as well and
> >>> use it.
> >>
> >> Ok, let me re-work it all under the c5/a5 directory. Thanks for
> >> reviewing.
> >
> > But you didn't really answer my question -- what is the problem with the
> > FPGA loader in SPL ?
>
> I thought you've already answered your own question. For whatever
> reason, the downstream A10 is re-doing the FPGA manager just for this
> purpose.

Could the reason be that the FPGA manager in it's current state expects one big
buffer with the entire FPGA bitstream ? When you're in SPL and you still don't
have DRAM running, you cannot create such buffer anywhere. Thus, what you need
to do is to have some sort of code which loads a bit of the bitstream file at
time and feeds it into the FPGA manager, piece by piece. This should be doable
pretty easily, what do you think ?

Best regards,
Marek Vasut