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Visitor miladmoo7
Visitor
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Registered: ‎12-29-2018

No framebuffer available while building Linux for Zedboard/QEMU-Zynq using Yocto

Hi there.

I am trying to build my custom Linux using Yocto and Poky reference design for Zedboard and Qemu-Zynq. However, I've had no luck adding X11 to my rootfs mainly because there is no framebuffer available and "/dev/fb0" doesn't exist, so X11 can not start.

I did some research and it turned out that I need to add some logic to my PL since HDMI is connected to PL instead of PS in Zedboards but I have no idea why there in no /dev/fb0 on QEMU-Zynq. I am using morty branch of Yocto and my machine name is "qemu-zynq7". 

Is it possible to add some framebuffer to "qemu-zynq7" machine? It's available for "qemux86" so there's got to be a way.

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Moderator
Moderator
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Registered: ‎11-09-2015

Re: No framebuffer available while building Linux for Zedboard/QEMU-Zynq using Yocto

Hi @miladmoo7,

You need to implement the frame buffer in the PL (FPGA part) and connect it to the HDMI. Use the video frame buffer IP, this will create your fb0 entry:

https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18842049/Video+Frame+Buffer+Read

Regards,

 


Florent
Product Application Engineer - Xilinx Technical Support EMEA
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