memory synchronization

[alexeimerkushin]

Hello, 

In our project we use  CPU P-4080, p/n-P4080NSN7PNC

I try to synchronize caching and I/O memory in my code. 

I have mapping of one physical memory area to two virtual blocks. First block has cacheable access and second standard I/O access. 

I write to physical memory via cache and try to read from I/O. See picture

Between the write and read process, I add call to sync() function, for flash cache data to memory. 

I can't read correct data from memory via I/O mapping block. 

Also I tried to use assembly call "mbar" with or without parameter. 

The result is same - wrong data after read operation.

Is somebody know how to synchronize the cache and I/O access?

Thanks in advance 

Alexei

[LPP]

Please, refer to Section 3.4 of this application note:

https://www.nxp.com/docs/en/application-note/AN3441.pdf 

If cacheable accesses are used, the store should be followed by the following:
1. dcbf or dcbst to the same address
2. msync
3. Load from the same address

Have a great day,
Pavel

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