Re: [PATCH 0/7] SoCFPGA: add support for Arria10

[Steffen Trumtrar <s.trumtrar@pengutronix.de>]

Trent Piepho <tpiepho@kymetacorp.com> writes:

> On Mon, 2017-04-03 at 12:55 +0200, Steffen Trumtrar wrote:
>> Although Cyclone5 and Arria10 share a lot of the peripherals,
>> they a different in the critical parts (SDRAM controller, clock setup,...)
>> 
>> The Arria10 has a larger OCRAM (64KB vs 256KB), that is why we can
>> omit the xload support for now. The xload support can be added, once
>> Arria10 boards that need to program the FPGA very early (might be needed for
>> the SDRAM controller) are available.
>> 
>
> That means this support doesn't include loading the FPGA from barebox?

That is correct.

>
> The boot strategy is that the Barebox PBL image will fit in OCRAM and be
> loaded by the ROM loader, and then the PBL will decompress barebox into
> SDRAM?  If so, it will be necessary to have the FPGA loaded from an
> external device, such as an EPCQ flash chip, before barebox boots.  As
> SDRAM is not accessible until at least the peripheral FPGA image is
> loaded.
>
> U-Boot is able to load a FPGA image with a single bootloader.  A U-Boot
> image can be made that is small enough run in 256 kB yet has enough
> drivers to load an FPGA image from eMMC or NOR flash into the FPGA and
> then enable SDRAM.
>
> It seems like this might be possible for barebox as well.  If enough
> drivers to load the FPGA were part of the PBL.

Of course this is also possible with barebox. The reason that the
support is not added yet, is that I do not have any Arria10 board that
needs or uses this; even with the provided vendor U-Boot.
This series is just groundwork for future development.

Regards,
Steffen

-- 
Pengutronix e.K.                           | Steffen Trumtrar            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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