Accessing a physical memory address

Hi

I want to read and write from a physical memory, the method I used is
ex: if memory address is 0x58000000
int a = 10;
int b;
* (volatile int * ) 0x58000000 = a;
b = *( volatile int * ) 0x58000000;
printf( " %d ", b );

in this way I am getting segmentation fault. What is right way to do this operation.

Thanks

You don't have access to physical memory unless you're deep in the kernel.

Normal user-space programs get given virtual memory by the kernel, and it's the kernel that's responsible for mapping virtual memory to physical memory.

Quote:

---

Originally Posted by Salem

You don't have access to physical memory unless you're deep in the kernel.

Normal user-space programs get given virtual memory by the kernel, and it's the kernel that's responsible for mapping virtual memory to physical memory.

---

Actually, I am working on a SoC which has Cortex R52 as real time core and Cortex A76 as application core and yocto Linux is running on that. I want to read value from the Linux side from a shared memory address, the value is written by R52.How can I do that

Then you need to write yourself a little kernel driver to run on the A76.