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EVM parallel NOR access problem (not at boot time)

Oswin
Prodigy 80 points

Hi,

I'm using the AM3559 EVM's NOR through the GPMC. I was able to program and read the NOR flash through the lld (from the official BSP).

I then added a Spansion filesystem over this, with which I formatted the NOR. I could make this several time without problem, I could also erase or write the flash through lld commands after that.

Since today, I can't write to the flash anymore, nor erase it. I have checked that the several locks are disabled (persistent lock and password). My GPMC config should be correct as it didn't change. It seems like every read operation just returns oxFF.

The NOR reacts to hard reset as it put the outputs to high-Z. Also, during a program operation, the polling operation ends with DEV_NOT_BUSY, but the data verification fails as it is still at 0xFF.

I also tried to make a soft NOR reset and power cycle the board, but it don't solve the problem.

Do you have any clue on what could be the problem ?
I didn't find any demo code in the StarterWare to test my NOR, is there something like this somewhere ?
Do you know any way I could test my NOR to be sure it's still functional ?

Thanks for your help,

CM