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The issue about Imx6 download mode configuration

Question asked by 许 磊 on Feb 3, 2018
Latest reply on May 3, 2018 by Yuri Muhin
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Hi all,
     We have done some custom boards based on imx6. The issue is regarding the USB OTG boot mode.The board download mode is configured as Serial downloader mode “01”, but the computer can't detect the hid devices.
     But the board download mode is configured as boot mode “00”,the computer can detect the hid devices.And the uboot can download completed,the serial ports printing information print output only a letter A.
    we design the Imx6D processor EIM bus as data interface with FPGA ,We don't use the pull-up resistance configuration the pin of boot_cfg, Will this have effect  to detect the hid devices?
    Has anyone out there faced a situation like this? And anybody knows the reason for this issue?