[yocto] U-boot enable not working for Raspberry Pi3

[Maciej Pijanowski]

On 06.08.2019 18:55, Greg Wilson-Lindberg wrote:
> I'm working with a Yocto Sumo build provided with Qt's boot2qt system. I'm trying to enable using Das U-boot to load Linux as a first step in trying to enable OSTree updates.
>
> In the meta-raspberrypi documentation is says to set:
>
> RPI_USE_U_BOOT = "1"
Hi. I'm working with the U-Boot and RPI3 at the moment as well. I'm 
using warrior revision and not using the
Qt at all though. In my case setting the above variable was enough to 
build the U-Boot and include it in
the final image.

In my case the platform boots into the Linux. I'm having issues with 
weird artifacts and resolution on the HDMI
display, though. I believe this may be related to the U-Boot patching 
DTB to add the
simplefb: 
https://github.com/u-boot/u-boot/blob/master/board/raspberrypi/rpi/rpi.c#L490
while I want to keep using  the brcm fb with userland etc. (proprietary 
stuff).

>
> to enable u-boot for the raspberrypi. I have set that variable in the top level local.conf file but I don't seem to be getting any changes in the build. Nothing in the cooker log shows building u-boot, and the start up screen doesn't show any u-boot messages.
>
> It appears that I'm missing necessary to turn u-boot on, can anybody shed some light on what is going on?
>
> Regards,
>
> Greg Wilson-Lindberg
> www.sakuraus.com

-- 
Maciej Pijanowski
Embedded Systems Engineer
https://3mdeb.com | @3mdeb_com