Re: pcie: fpga: programme FPGA PROM’s

[Moritz Fischer <mdf@kernel.org>]

On Wed, Jun 06, 2018 at 10:40:47PM +0530, Muni Sekhar wrote:
> On Wed, Jun 6, 2018 at 9:18 PM, Moritz Fischer <moritz.fischer@ettus.com> wrote:
> > Hi Muni,
> >
> > On Wed, Jun 6, 2018 at 4:37 AM, Muni Sekhar <munisekharrms@gmail.com> wrote:
> >> On Wed, Jun 6, 2018 at 4:50 PM, Ludwig Petrosyan
> >> <ludwig.petrosyan@desy.de> wrote:
> >>> Hi
> >>>
> >>> why You do not use jtagplayer from Xilinx?
> >>
> >> Yes, JTAG can be used. But we have a lot many of these FPGA boards,
> >> using JTAG costs more. And also we want to automate the PROM
> >> programming.
> >>
> >>
> >>>
> >>>
> >>> with best regards
> >>>
> >>>
> >>> Ludwig
> >>>
> >>>
> >>>
> >>> On 06/06/2018 11:08 AM, Muni Sekhar wrote:
> >>>>
> >>>> [ Please keep me in CC as I'm not subscribed to the list]
> >>>>
> >>>> Hi All,
> >>>>
> >>>> We have a Kintex7 FPGA board connected to Intel Atom PC running Ubuntu
> >>>> on PCIe bus.
> >
> > Are you using a Tandem flow? What kind of PROM are we talking about QSPI flash?
> I'm not sure about the Tandem flow, can you please clarify me on this?
> 
> Okay, we have two onboard PROM’s (Micron’s SPI NOR Flash MT25QL128).
> The FPGA will be loaded from one of the two onboard PROM’s, it will be
> up and running before the PC powers up.

In which case you don't need Tandem. Tandem basically just brings up
minmal bitstream to bring up PCIe link and does the rest via some sort
of partial reconfiguration flow. This allows to meet the PCIe deadline.

> When the Intel Atom PC powers up the FPGA will enumerate over PCIe.
> I'm looking for any available Linux tool(user space or kernel space)
> to program the PROM's via PCIe interface.

Any reason you can't drop a SPI controller in the fabric and use that
to program the FPGA or do you intend to do the initial programing of
the PROM also over PCIe?

- Moritz