Re: OLinuXino, a serious Rasberry Pi competitor?

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#251

From: Joel Koltner
Date: Fri, 09 Mar 2012 19:45

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wzab wrote:
> Exactly. What I'm looking for is the Embedded Linux Computer with FPGA
> connected directly to the CPUs bus and to 0,1" headers, so that my
> students could deal with different peripherals (implemented in the
> FPGA)
> and connected to simple circuits assembled on the breadboard (or on
> prototype PCB connected via flat cable).
> Does anybody knows about such cheap boards?

No, but keep in mind here that some Linux-capable CPUs these days are 
pretty fancy (caches, superscalar, etc.) and have CPU busses that are 
non-trivial to interface too -- it's a lot more complex than the old 
days of data, address, and a R/W strobe.  Similarly, many CPU busses are 
fast enough that you might not get away with ribbon cables anymore 
unless you're running, e.g., every other wire as ground.

So just be careful to avoid those for your purposes. :-)

(In a modern PC, while things like PCI cards are memory-mapped, when 
someone writes a line of code as simple as *MyDeviceRegister = 
0xdeadbeef, what actually happens is a very complex transaction between 
the CPU, its local bus, the north bridge, the PCI bus, and whatever chip 
is on the target PCI device.)

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