Performing secure address relocation within a multi-processor system sharing a same physical memory channel to external memory

In response to receiving a selection to override an existing memory allocation of one or more regions of an external memory device within a memory register for a particular bridge from among multiple bridges within an integrated circuit, wherein the multiple bridges connect to a shared physical memory channel to the external memory device, a remap controller of the particular bridge reads, from a super rank register, one or more super rank values specifying one or more relocation regions of the external memory device connected to an interface of the integrated circuit. The remap controller remaps the memory register for the particular bridge with the one or more super rank values specified in the super rank register to relocate memory accesses by the bridge to the one or more relocation regions of the external memory device.