MBAR register usage

[ManjulaMankar]

We are trying to port the software of MPC8250 to MPC8270 . Since, MBAR register is part of MPC8270 only and not part of MPC8250.

I would like to know the MBAR register usage and what is the impact if we don't store any address in the MBAR register?

Please share your thoughts.

[Oswalag · Accepted solution]

Hello,

The MBAR register is a G2_LE core SPR. It is described in the G2 core manual as intended to hold memory base address for the system memory map. In the MPC8270 it has not special meaning because the MPC8270 is a member of the MPC8260 family. The MPC8260 family devices originally use the IMMR register to locate memory-mapped registers.