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imx6q configuration WEIM bus for ST16C554 expand UART ,Resive data error

Question asked by AL ee on Mar 7, 2019
Latest reply on Mar 11, 2019 by AL ee


     I configuration the imx6q WEIM bus and connected the ST16C554 to expand 4 uart port , then I used the serial port to resive data,it's possible to get the wrong data such I send the data is "0x55",but i got the data "0x00"(if I got the error data it's always 0x00),most time i can get the correct data "0x55".

    My board is I.MX6Q,and the linux kernel is 3.14.52

    Someone met the same problem? and could you give me some idear

thanks very much!!