I have an N810 and sincerely the device has long been abandoned by me. Since one of my hobbies is electronics, I like to do something with the device from 0. That is, develop from 0 an "operating system" I have been reading enough of the OMAP and how to generate the boot loader for ARM. I would need to know a little of the electronic architecture of the N810.

Someone has any information where to start?

regards,
Pinnchus

Start by analysing open bits from previous incarnations of maemo. Building OS from scratch is a few years deal for a big team of talented programmers with cooperation from designers etc. Not really a one-person effort, but good luck