Ok, I had a bit of fun writing drivers for the buttons and the display, I created the file system (still not writable though). Now I'd like to start programming the operating system's kernel.
I updated the description on this page with a first idea of how I will program and plan to use the kernel. More details are on my github in the 'docs' directory on the 'dev' branch.
Feel free to give me advice while I'm developping it.