EST SBC8260 Question

EST SBC8260 Question

[Gessner, Matt]

Greetings,

I'm trying to access the upper 8MB of the 16MB SDRAM.
But it's not working.

On mine, and I'm sure most others, it's tied to /CS2 and /CS3.
But the example BSP I have from EST doesn't set up /CS3.

Can anyone who's using this board please shed some light
on what's going on?

/CS2 is setup to use 16MB.

TIA

Matt

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Re: EST SBC8260 Question

[Dan Malek]

"Gessner, Matt" wrote:

> Can anyone who's using this board please shed some light
> on what's going on?

It depends upon the type of DIMM you are using.  Mine has the 2M x 64
DIMM, so it uses only /CS2 to get the 16 Mbyte space.  It also depends
upon the DRAM controller configuration.  Make sure you have the DRAM
controller properly configured to route the address lines.


	-- Dan

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Re: EST SBC8260 Question

[Neil Russell]

On Fri, May 26, 2000 at 12:02:37PM -0400, Dan Malek wrote:
> > Can anyone who's using this board please shed some light
> > on what's going on?
>
> It depends upon the type of DIMM you are using.  Mine has the 2M x 64
> DIMM, so it uses only /CS2 to get the 16 Mbyte space.  It also depends
> upon the DRAM controller configuration.  Make sure you have the DRAM
> controller properly configured to route the address lines.


The vxWorks BSP expects a stick with one bank of 16MB SDRAM.  If you didn't
get such a stick from EST, I'd go back and complain.  Alternatively, you
could put a stick in that has a bank that is at least 16MB.  I have a 128MB
stick in mine and it happily pretends to be 16MB.


Neil.

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