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board testing with u-boot command line

Question asked by David Luberger on Sep 10, 2018
Latest reply on Sep 11, 2018 by David Luberger

I have a new custom board, and i want to do things like test gpio connections, test my display etc. my display, for example, is being held in a disabled state (i.e., the backlight and logic power supplies) so i can't even see if the backlight works.

 

i'm having trouble compiling and flashing u-boot, so i was wondering: using the i.mx6ull evk sd card demo, can i use the u-boot command line to toggle gpios and do other things like set a test image on the lcd if it comes up? i see that i can read and write registers directly, and i also see there is a gpio command, but i can't get any of it to work because i don't know the proper syntax to go with the demo sd u-boot build.

 

how can i test my board with the demo sd u-boot, without having to modify and re-compile underlying c-code?

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