Re: request_mem_region kindly reply to this....

[Mohammad M Molla <merajul_i@xxxxxxxxx>]

Hello,

request_mem_region() can fail if the memory requested is already allocated to some other device. 

If you are programming a pci card you should use PCI API for querying information about required memory regions and then map/unmap those regions using 'ioremap/iounmap' in your driver. You can read pci.txt in Documentation dir. of kernel to learn PCI API.

Hope this helps.

Regards,
- Meraj


vasant j <vasant.embsys@xxxxxxxxx> wrote:

Hi all,

 

            I am new to linux programming....i am programming for PCI card.....My problem is i have used "request_mem_region( )" command and requested for 1k of memory.....It is returning failure.How to tackle this....

 

         i  did like this :

 char *p;

p=request_mem_region(0x2000,0xb,"pci");

 

it is returning null !...(failure) .

 

should i fill the struct resource elements.... and then do it or can i directly request for the memory from the given location.....as i did now

 

Kindly reply to me regarding this As soon As possible....

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