with QNX you'll need IO privileges
add this ThreadCtl before mapping:

	int rc = ThreadCtl( _NTO_TCTL_IO, 0 );
	if(-1 == rc) {
		printf("can't get IO privileges\n");
		exit(-1);
	} 

>-----Ursprüngliche Nachricht-----
>Von: Ricardo Ahumada [mailto:community-noreply@qnx.com] 
>Gesendet: Mittwoch, 23. September 2009 00:26
>An: momentics-community
>Betreff: Problem accessing NV memory 
>
>Hi,
>I a new to QNX and I am trying to port from VxWorks. In the 
>CPU board I have NV RAM located at: 0x00F00000 I have the 
>following code but is not working: 
>ThreadCtl(_NTO_TCTL_IO, 0);
>
>int val =  munmap( 0x00F00000, 0x1F400 );
>
>    volatile uint32_t * bat_pub_addr;
>    bat_pub_addr = mmap_device_memory( 0,
>					 0x1F400,
>                     PROT_READ|PROT_WRITE|PROT_NOCACHE,
>                     0,
>                     0x00F00000);
>
>
>    if (bat_pub_addr == MAP_FAILED )
>      {
>      	cout << "bat pub alloc error " << errno << endl;
>      }
>When I try to access the bat_pub_addr  by showing memory I get 
>all 0xFFFFFFFF This works OK in VxWorks, so is not a hardware issue.
>Am I doing something wrong here. 
>
>Please Help.
>
>Ricardo
>
>
>
>
>_______________________________________________
>
>QNX Momentics Community Support
>http://community.qnx.com/sf/go/post38519
>
> 
 
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The munmap is not necessary - the first parameter to munmap is a virtual address, not a physical address!

I'm not sure that's the error though.  What platform is this running on?

Ricardo Ahumada wrote:
> Hi,
> I a new to QNX and I am trying to port from VxWorks. In the CPU board I have NV RAM located at: 0x00F00000
> I have the following code but is not working: 
> ThreadCtl(_NTO_TCTL_IO, 0);
> 
> int val =  munmap( 0x00F00000, 0x1F400 );
> 
>     volatile uint32_t * bat_pub_addr;
>     bat_pub_addr = mmap_device_memory( 0,
> 					 0x1F400,
>                      PROT_READ|PROT_WRITE|PROT_NOCACHE,
>                      0,
>                      0x00F00000);
> 
> 
>     if (bat_pub_addr == MAP_FAILED )
>       {
>       	cout << "bat pub alloc error " << errno << endl;
>       }
> When I try to access the bat_pub_addr  by showing memory I get all 0xFFFFFFFF
> This works OK in VxWorks, so is not a hardware issue.
> Am I doing something wrong here. 
> 
> Please Help.
> 
> Ricardo
> 
> 
> 
> 
> _______________________________________________
> 
> QNX Momentics Community Support
> http://community.qnx.com/sf/go/post38519
> 

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