I am looking for a book explained how to make a computer by using Arm core processors?
> Is there a book(s) to learn how can I build boards like Rasperry-Pi ?
Not that I know of - it would be many books worth of knowledge!
A word of warning before heading down this route. For most devices you can't easily build the PCB as a hobbyist - most Cortex-A cores are packaged in a BGA package with hundred of pins, requiring multi-layer PCBs which require specialist equipment to manufacture. To be honest even soldering surface mount components onto a PCB you've had made is difficult enough to do reliably. Most projects I know of design the board themselves and outsource the fabrication of the PCB and soldering to a dedicated manufacturing company.
Most "home projects" I've seen building tablets or home servers using Arm take an existing board, such as a Rasberry Pi, Arndale Board, or Beagle Bone Black, and then "add things" to it via USB, ethernet, MIPI, or even serial and GPIO to build up the complete system. And then make a cool case for it of course =) This is much less likely to go wrong (you are using a pile of existing technology which is well tested and well supported), and to be honest - much less expensive. You can get some pretty good development boards which are almost complete home computer systems for under $100; making your own custom PCB can cost more than that by itself as you are not making enough of them to get a low per-unit price.
Hope that helps, Pete
Thank you Pete. But I want to learn designing knowledge, it's too important for me. I do not want to build any project soon. I have a Discovery board of STMicroelectronics and did some projects with it, But now I wanna learn how can I build my own board. To obtain this knowledge is very important than cost for me!