AW: Barebox for Zedboard

[Michael Graichen <michael.graichen@hotmail.com>]

________________________________________
Von: Lucas Stach <l.stach@pengutronix.de>
Gesendet: Donnerstag, 19. März 2020 11:53
An: Michael Graichen; barebox@lists.infradead.org
Betreff: Re: Barebox for Zedboard

Hi Michael,

Am Donnerstag, den 19.03.2020, 10:38 +0000 schrieb Michael Graichen:
> Hey,
>
> i have just started working on a Zedboard (http://zedboard.org/product/zedboard) with an Xilinx Zynq XC7Z020 SOC.
> I have seen that Barebox has an defconfig for the zynq
> so i tried
>
> export ARCH=arm
> export CROSS_COMPILE=arm-cortexa9-linux-gnueabihf-
> export PATH=/opt/OSELAS.Toolchain/arm-cortexa9-linux-gnueabihf/bin:$PATH
> make zynq_defconfig
> make -j`nproc`
>
> which compiles me the image
>
> barebox-flash-image -> images/barebox-avnet-zedboard.img
>
> when using u-boot i had to generate a BOOT.bin file with Xilinx's ./bootgen tool
>
> dev$ bootgen -image bootimage.bif -o i BOOT.bin
>
> and .bif file was
>
> dev$ cat bootimage.bif
> //arch = zynq; split = false; format = BIN
> the_ROM_image:
> {
>      [bootloader]FSBL.elf
>      design_1_wrapper.bit
>      u-boot.elf
> }
>
>
> that i copied onto an SD-Card and powed up the board.
>
> But since i want to use Barebox how do i produce the BOOT.bin file?

The barebox-avnet-zedboard.img already is the BOOT.bin image, just copy
it to the SD card with this name and you are done.

> and how is the programming of the FPGA Logic done?

Barebox currently doesn't support loading the FPGA bitstream. We are
still lacking a driver for the DevC PCAP interface. Zynq support in
Barebox is only a spare time (and thus toy) project at this time. It
works okay for booting Linux on the PS part of the system, but almost
fully lacks support for the PL part.

That said I wouldn't mind helping with getting the missing bits added
by reviewing/testing patches. :)

Regards,
Lucas

Hey Lucas, 

"That said I wouldn't mind helping with getting the missing bits added
by reviewing/testing patches. :)"

Did you made any attempts to do this?

As far as I can see there are basicly two ways.  
The "Xilinx-Way" by packing everything in Boot.bin.
https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841976/Prepare+boot+image
and the "Linux-Way"
https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841645/Solution+Zynq+PL+Programming+With+FPGA+Manager
using the FPGA manager 
https://elixir.bootlin.com/linux/latest/source/drivers/fpga/zynq-fpga.c

Best regards
Michael


 





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