[ECOS] How program the Chip Slect on at91?

[ECOS] How program the Chip Slect on at91?

[Jaws]

Hi all,
    I'm trying to use an EB40A connected with an ethernet Chip CS8900A.
To interfacing them I'm using EBI expansion Bus and I connected the CS8900A
chip select to NCS1.
I have to program this chip select to remap my device to the address
0xf0000300.
How can I do this? What changes and where is the best place to insert this
changes?

Thanks in advance
Jaws

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[ECOS] Re: How program the Chip Slect on at91?

[Jani Monoses]

Jaws wrote:
> Hi all,
>     I'm trying to use an EB40A connected with an ethernet Chip CS8900A.
> To interfacing them I'm using EBI expansion Bus and I connected the CS8900A
> chip select to NCS1.
> I have to program this chip select to remap my device to the address
> 0xf0000300.
> How can I do this? What changes and where is the best place to insert this
> changes?

Look at how the edb7xxx platfrom uses the generic cs8900 driver
devs/eth/arm/edb7xx.

make a similar package for your platform and include it in your build.

Jani


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Re: [ECOS] How program the Chip Slect on at91?

[Dirk Eibach]

Hi,

>     I'm trying to use an EB40A connected with an ethernet Chip CS8900A.
> To interfacing them I'm using EBI expansion Bus and I connected the CS8900A
> chip select to NCS1.
> I have to program this chip select to remap my device to the address
> 0xf0000300.
> How can I do this? What changes and where is the best place to insert this
> changes?

have a look at 
packages/hal/arm/at91/eb40a/current/include/hal_platform_setup.h


Cheers,
Dirk


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RE: [ECOS] How program the Chip Slect on at91?

[Paul D. DeRocco]

> From: Jaws
>
>     I'm trying to use an EB40A connected with an ethernet Chip CS8900A.
> To interfacing them I'm using EBI expansion Bus and I connected
> the CS8900A chip select to NCS1.
> I have to program this chip select to remap my device to the address
> 0xf0000300.
> How can I do this? What changes and where is the best place to insert this
> changes?

By the way, the chip selects can only be programmed to multiples of one
megabyte, e.g., 0xF0000000. If you don't mind your device mirrored
throughout a one megabyte range (i.e., 0xF0000000 to 0xF00FFFFF), then
you're all set. If you need finer granularity, to prevent it from responding
to other addresses in the range, your hardware has to decode the lower order
address lines directly.

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com


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