gdb and mmap

[David Stroupe]

I am mmap()ing a memory range proovided by a driver.  In gdb if I do a 
/x address I get an Cannot access memory at address 0x4001b000 error. 
If on the other hand I do somethink like
str = (char*) address;
printf("%s\n", str);

I see the string that is stored in the address.

Is there a way for me to tell gdb that the mmap()ped address is a valid one?

TIA
David