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Accessing board hardware, also custom logo/splashscreen

Question asked by David Luberger on Feb 6, 2018
Latest reply on Feb 7, 2018 by David Luberger

i.mx6ull evk.  I followed the instructions to put Linaro Debian on the board, and everything is up and running. now I have a couple questions. First, hopefully simplest: how do I show a custom splashscreen that just hides everything displayed during boot or at least show my logo instead of the NXP and linux penguin logos during boot? 


Second, I realize there is a device tree, and there is are files and folders in /sys that give me access to the peripherals on the micro, but how in the world do i use them? when i try searching the internet for examples, everything is for the raspberry pi.  i want to read and write comm bytes via uart, i2c, and spi, and read and toggle gpio bits.  All the stuff that the i.mx6 provides as a microcontroller beyond just running linux.