RaspberryPi with U-Boot and FDT

[Jan.Sommer at dlr.de]

> -----Original Message-----
> From: users [mailto:users-bounces at rtems.org] On Behalf Of
> Jan.Sommer at dlr.de
> Sent: Tuesday, June 9, 2020 3:01 PM
> To: users at rtems.org
> Subject: RaspberryPi with U-Boot and FDT
> 
> Hello,
> 
> I recently updated my RaspberryPi2-Setup to a more recent version.
> So far we used u-boot and ran the ELF-binary directly using the "bootelf"
> command.
> Now with the commit "362cf319d4 - bsp/raspberrypi: Updated the console
> API" it seems the console driver has been changed to require a FDT to be
> available.
> I assume, I now need to build an u-boot image with mkimg and then pass the
> FDT address to it.
> So far, I had no success. I created the image file with:
> 
> arm-rtems5-objcopy -R -S --strip-debug -O binary ticker.exe ticker-fdt.bin
> cat ticker-fdt.bin | gzip -9
> mkimage -A arm -O rtems -T kernel -a 0x00200000 -e 0x00200000 -n RTEMS -d
> ticker-fdt.gz ticker-fdt.img
> 

I compared my mkimage call with the one from altera-cyclone BSP (https://docs.rtems.org/branches/master/user/bsps/bsps-arm.html#altera-cyclone-v-intel-cyclone-v)
I changed mine to use "-O linux" too and now it works.

> And tried to run it with
> 
> bootm ${loadaddr} - ${fdt_addr}
> 
> Has someone experience how to get it working with u-boot?
> Do I need to configure something additionally in the rtems configuration?
> 
> Best regards,
> 
>    Jan
> 
> 
> Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
> German Aerospace Center
> Simulation and Software Technology | Software for Space Systems and
> Interactive Visualization | Lilienthalplatz 7 | 38108 Braunschweig | Germany
> 
> Jan Sommer
> Telephone +49 531 295-2494 | Telefax 0531 295-2767 | jan.sommer at dlr.de
> DLR.de/SC
> 
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