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Is it possible to reinitialize the DDR controller on the MPC8548 processor without a hardware reset?

Question asked by Mark Palamar on May 10, 2016
Latest reply on May 10, 2016 by ufedor

Hi, I am supporting a custom single board computer based on an MPC8548 processor. The board support package initializes everything at power on reset. We have a requirement to reinitialize the board from a software commanded reset.

 

On other MPC8548 based boards we would write to the reset control register (offset 0xE_00B0).  However, the board designer has confirmed that the HRESET_REQ signal is not connected to anything that could perform the reset.

 

So, therefore I am trying to reinitialize everything in software.  I am able to reinitialize the DDR controller while running in flash memory. Unfortunately, this does not work 100% of the time (approximately 1 out of 20 attempts it might get stuck waiting for D_INIT to clear) and the documentation (MPC8548 Reference Manual) partially implies that this can only be done after a reset.

 

Is it possible to reinitialize the DDR memory controller on the MPC8548 without a hardware reset?

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