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 <[EMAIL PROTECTED]> 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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