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12748 Discussions

Request_Region

Altera_Forum
Honored Contributor II
‎11-15-2009 04:52 PM
1,168 Views

Hi, 

 

I'm trying to write an interrupt driver. I have seen that many drivers inside init_function appeared a function like "request_reg_region". I have read some documentation about the function but I haven't clear my ideas. I don't understand the necessity of doing this manner, because inside uClinux there is the document "nios.h" where appear all my physical adress which I can access my hardware. 

 

If someone can explain me which are benefits. 

 

Thanks a lot.
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Altera_Forum
Honored Contributor II
‎11-15-2009 09:23 PM
501 Views

You should never directly access hardware registers. The new NIOS Linux distribution is able to use the MMU and thus any (driver-) software should be done in a portable way. 

 

-Michael
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Altera_Forum
Honored Contributor II
‎11-17-2009 11:01 AM
501 Views

OK I understand thanks for the answer.

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