Re: OLinuXino, a serious Rasberry Pi competitor?

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#261

From: wzab
Date: Fri, 09 Mar 2012 22:31

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On Mar 9, 9:22 pm, n...@puntnl.niks (Nico Coesel) wrote:
> wzab <wza...@gmail.com> wrote:
>
> >> What's the form factor? Does it have 0.1" headers so you could add
> >> processor horsepower to a veroboard / stripboard? That would be great
> >> for quick one-off tinker stuff.
>
> >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)
>
> Don't count on connecting a CPU bus. Those days are long gone. The
> speeds are too high. DDR and flash memory usually have dedicated
> busses. Even if you could craft something that resembles a memory bus
> there are many issues to work out. Especially if you would make the
> bus go over headers. Nowadays you'd use GPIO, I2C, SPI or USB.
>

Why do you think so? E.g. in a board based on AT91SAM9G45
( http://www.atmel.com/Images/doc6438.pdf ) you can easily connect
DDR
RAM to dedicated pins (DDR_A* DDR_D* etc.) and use separate EBI
pins to connect FPGA.

We have created such prototype a few years ago
( http://www.ise.pw.edu.pl/~wzab/artykuly/fpga_edu.pdf ), but now
it could be done much cheaper, and provide much better parameters.

The idea is to have a single hardware configuration, which may be
configured to have an PC working with simple bus connected peripheral
or with complex Bus Mastering DMA capable peripheral, or a
peripheral connected via ISI, I2S, SPI or whatever else.

--
Regards,
Wojtek

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From: wzab <wzab01@gmail.com>
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Subject: Re: OLinuXino, a serious Rasberry Pi competitor?
Date: Fri, 9 Mar 2012 14:31:43 -0800 (PST)
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