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AM4376 EMIF ECC Control

Hi, every gurus .

this is My  issue:   How to properly adjust  EMIF ECC

my goal:  detect DDR error

My test :  DDR read/writre in Uboot

My setting:

   EMIF4D_ECC_CTRL  :

enable      REG_ECC_EN /  REG_ECC_ADDR_RGN_PROT / REG_ECC_ADDR_RGN_1_EN / REG_ECC_ADDR_RGN_2_EN

 

result-----> ECC_ERR_CNT has increased  , and  my DDR read/write test Error    

why?