Re: [microblaze-uclinux] DCR support

[Rod Campbell <rod@xxxxxxxxxxxxxxxxxx>]

Hi,

Since uClinux is MMU-less, you can write to the same addresses that you 
would in a stand-alone microblaze program. We have several peripherals 
that we do that with. It is our opinion that in the embedded world this 
is OK.

This does break the spirit of a user-space linux app. If you want to 
stay true to that spirit, you would probably need to write a linux 
driver to interface the peripheral.

We are using uClinux 2.4, not Petalinux - so the procedure to follow to 
get a C-style address may be different, but what we do is include the 
following in our code:
#include <linux/autoconf.h> // board auto-config parms passed from 
Xilinx XPS
Of course you can always #define the address yourself since you know 
from XPS what addresses were assigned to your peripherals.

Hope this helps,

Rod Campbell


Winston wrote:
> Hi all,
>
> I’ve used a DCR in my project. But now I have some difficulty in using 
> it with uclinux.
>
> I hope to send a word to DCR peripheral register from CPU. In Xilinx 
> kernel, this can easily be done by simply writing to physical address 
> of the register. But how can I do that with uclinux? I didn’t find any 
> device which looks like DCR peripheral. If it is similar with Xilinx 
> kernel, how can I know its physical address?
>
> Please help me. Thank you a lot.
>
> Regards,
>
> X. Y. Zhu

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