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I encountered also a problem with these "native hdmi" examples, which tries to directly write to the frame buffer /dev/fb0
Currently I investigate why they do not work, but using the latest image from the github releases (2016.11 7020 with hdmi) and executing as root (not parallella) in a tty it worked for aobech, but not for mandelbrot.
For my purpose (image processing debugging) this is sufficient, but executing as root makes me goosebumps. Probably it is a read permission issue with the shared libraries.
I looked at the Makefile and recognised if one "make" the aobech project , that it is without direct frame buffer writing . Instead, the coprocessor operates in a separate buffer and the arm is copying it to the /dev/fb0. If you uncomment the added compiler flag in the Makefile, it does not work, like the mandelbrot example. The board hang up, so maybe the smem address of the frame buffer is faulty? Has anyone a guess?
Does anybody know, what is wrong with these examples?
Many greetings from Germany,
Matthias
Statistics: Posted by MatthiasP — Wed Aug 29, 2018 12:51 pm
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