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id=0xff is definitely an error, since this means the data rx line is stuck to high level, namely the undriven state or, equivalent, the epcs_controller rx register contains invalid data.
Then read and write operations will probably not work.
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I agree with you...
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"small driver" feature has been selected, or if fast simulation has been requested
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Sim already posted that small driver are selected but he enabled ALT_USE_EPCS_FLASH; from an image he posted yesterday correct epcs init function is enabled.