Pi 3B addressable physical memory

Question

Using valgrind, I have found a program (written by co-worker) receives a bus error:

Non-existent physical address at address 0x4859008

This had me wondering how physical memory was mapped. I read that the memory split between the gpu and cpu can be configured. I set this to the maximum allowed split, gpu = 16M and arm = 992M. By doing this, I thought that would increase the total number of physical addresses available to the CPU. I still receive the bus error, so either my logic is not correct or the increase was not enough.

My question is this: what is the maximum physical memory address available to the CPU?

EDIT: The issue with the program was resolved (a permissions issue). This question is about physical memory.

Answer 1

As stated in the BCM2835 Manual, physical memory addressing ranges from 0x00000000 to 0x40000000.

Physical addressing starts at 0x00000000 for the ARM processor. The VideoCore MMU will map a portion of the ARM physical address space to it's own bus address space within this range. This portion of memory must be no less than 16MB and no greater than 944MB using the default memory mapping. Any peripherals will be mapped from 0x20000000 to 0x20FFFFFF.