Re: MPC563 Internal Flash - how to clear censorship?

Already solved the problem. Here is the solution in case someone else
runs into this:

The censorship of the internal flash was in the following state:
ACCESS=0, FIC=0, and CENSOR[0..1] = 0. In this state you can still set
the censor bits. By setting one of the censor bits (important: not
both!), you can obtain access to the internal flash again. To set one
of the censor bits, you can follow the basic procedure as outlined in
the MPC563's user manual.



--- In [email protected], "microcodefun" <voorburg@g...> wrote:
> Hi,
> 
> By running the demo from Freescale's general market flash drivers
> (NVM_GMD), I accidentally set the censorship of the internal flash
> memory. I'm now stuck in a situation where I can no longer access
> the
> internal flash. Any ideas on how I can clear this again? I'm using
> Trace32. 
> 
> I tried clearing it myself using the routine as outlined in the
MPC653
> user manual. The problem seems to be that IWS, which is bit 15 in
the
> reset configuration word, is 0 and therefore as part of the censor
> clearing sequence, a write to the flash array needs to be made. This
> doesn't seem possible because the internal flash array cannot be
> access, due to its censorship.. 
> 
> As far as I understand, I need to be able to change IWS to 1, which
> allows me to use a censor clearing sequence that doesn't require a
> write to the internal flash array. Since IWS is part of the reset
> configuration word (bit 15), I need a way to change this bit to a 1.
> According to the manual I can only change the reset configuration
word
> by setting a specific signal on bus-lines 0..31 upon reset or by
> changing the reset configuration word in the shadow row of the
> internal flash array. 
> 
> Since I don't have access to the internal flash array, this last
> option is not possible. The first option is also not possible for me
> because the system I have is in an enclosed casing, restricting me
> access to the bus-lines. Any possibilities that Trace32 allows me to
> manipulate the reset configuration word upon chip reset?
> 
> Thanks!!!




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