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Using SD flash ubl and uboot issue of Appro IPNC DM368

Hello , engineer~

           I use the method from TI Wiki "SD card boot and flashing tool for DM355 and DM365" to flash uboot and

ubl for Appro IPNC dm368, From Step1  to Step8 are always OK,but after I insert my SD into the board,I can.t see

any thing in my terminal with UART.

          Because Appro IPNC dm368 dosen't have a boot mode switch of UART,and at the same time ,  the method of using CCS and JTAG is too complex, so I want to use SD boot mode to flash UBL and UBoot into the new boards.

          Can you give me some advise?

          I'm looking forward to your reply!  Thanks so much!