Hello All.

Working on porting SDIO driver on to QNX. I am using DMA for reading and writing data basically for DMA iam using 4 
bytes  for transfer meaning 
i need to read an integer value using DMA by passing integer address for DMA.

How is this done.

I have an integer variable int value; 

For DMA i get the physical address of this address value 

mem_offset64(&vaue, NOFD, 1, &offset, 0)

This physical address is used for DMA.  Problem i see is iam not able to get any value from the controller later using 
mmap for 4 bytes allocation i got the adress same address was used for DMA which was successful. 

Later i used volatile int value which also didn't give the right physical address for successful DMA.

Is there a way where i can get right physical address for address of value which will result in successful DMA.

Regards
Kaushik