Where to start developing a single board computer?

Question

ARM

Continuing my previous question. Now I know exactly what I need.
Throw literature on this topic, everything you need to know in order to create your own unicameral computer.
How to properly route the tracks, the chipset, it is also desirable to link to the manufacturer of microelectronics in order to order a processor based on the arm cortex-a7 core, etc.

Answer 1

I would start by studying the existing options (and there are not one or two, but at least a dozen), identifying their problem areas - with the goal of not stepping on someone else's rake in my version.
And yes, taking on Cortex-a7 right away is a bold move. It would be better to start with something simpler and lower frequency - with AVR, PIC16 or STM8.

Answer 2

If you start everything from the very beginning, then these are:
Physics - Electrodynamics, etc.
L.A. Bessonov - Theoretical foundations of electrical engineering.
V.P. Sigorsky - Mathematical apparatus of an engineer.
Digital signal processing and everything connected with it.
Numerical methods.
E. Ugryumov - Digital circuitry.
Martin T. Application of AVR microcontrollers: schemes of program algorithms.
There are also useful sites:
easyelectronics.ru/category/avr-uchebnyj-kurs/page/5

Answer 3

So far, I've dug up information on PCB layout, MB
Ardizzoni J. Keep High-Speed ​​Circuit-Board Layout on Track
Brokaw P. An IC Amplifier User's Guide to Decoupling, Grounding, and Making Things Go Right for a Change
Brokaw P., Barrow J. Grounding for Low- and High-Frequency Circuits
Buxton J. Careful Design Tames High-Speed ​​Op Amps
DiSanto G. Proper PC-Board Layout Improves Dynamic Range
Grant D., Wurcer S. Avoiding Passive-Component Pitfalls
Johnson HW, Graham M. High-Speed ​​Digital Design, a Handbook of Black Magic. Prentice Hall, 1993.
Jung W., ed., Op Amp Applications Handbook