What is the usage of mirror flash in MPC57XX?

[jerrytomlee]

Is it for ECC or other thing? 

Can those area be accessed?

[davidtosenovjan]

Could you specify used device more concretely?

[jerrytomlee]

MPC574xP

As is shown there are mirror flash memory in the Manual.

This is from the Reference Manual of MPC5744P

[davidtosenovjan]

It is due to calibration i.e. remapping flash portion by SRAM. On the predecessors such operation has been done by MMU (using of virtual addresses). As MMU is no longer present, overlay support has been added.