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Re:Blinking LED Using Elixir Embedded Image on Raspberry Pi by Joeboy on Tuesday April 28, 2015 @02:12PM (#9454193)
Blinking the LED using only the GPU (which weirdly is responsible for the initial stages of booting the rpi):

https://github.com/hermanhermitage/videocoreiv/tree/master/b...

Re:Blinking LED Using Elixir Embedded Image on Raspberry Pi by duskwuff on Tuesday April 28, 2015 @03:17PM (#9454515)
The BCM2835 is probably best described as a VideoCore IV GPU with an ARM core bolted on the side. :)