[meta-xilinx] Support for PicoZed 7030 and FMC V2 Carrier

[Andreas Galauner]

On 10.07.2018 17:05, Thomas Goodwin wrote:
> Hello,
> 
> I'm attempting to build the picozed-zynq7 machine using meta-xilinx with
> Poky 2.4.2.  I've tried using the /rocko/ branch as well as
> /rel-v2018.2/.  For the latter, I had to patch the machine definition
> since it was missing /require
> /(PR: https://github.com/Xilinx/meta-xilinx/pull/9).  My layer
> configuration is:
> 
> BBLAYERS ?= " \
>   /ssd/yocto_projects/picozed/poky/meta \
>   /ssd/yocto_projects/picozed/poky/meta-poky \
>   /ssd/yocto_projects/picozed/poky/meta-xilinx/meta-xilinx-bsp \
>   "
> 
> In each case, I can build /core-image-minimal/, however there is no
> console output on boot over the UART.  The D10 and D11 PS LEDs on the
> FMC carrier card are flashing in sync.
> 
> Has anyone else successfully built for this target recently?

Yes, the u-boot device tree is broken for the Picozed. There is no
console defined (the chosen/stdout-path node is missing) and because of
that u-boot panics and the board resets. That's why the LEDs are "blinking"

I stepped through the code using JTAG and found out what's causing this
after a longer debugging session. I fixed the device tree and it started
to work. I also added some more stuff to it like USB, QSPI and the
Ethernet MAC. In theory that should make them work as well, but I'm not
sure if I ever tested that.

You find the patch attached. Maybe Xilinx should upstream that. The
u-boot is just broken on Picozeds without this.

- Andy
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