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How to load imag.bin from sd card

Hi TI

I translation image.bmp into tv.bin, and I have initialed fb0 start register and fbo end register like below

             wr 0044   80050000

             wr 0048   80064000

then we in boot mode:

          U-Boot# fatload mmc 0 0x80050000 tv.bin
                      reading tv.bin
                     40960 bytes read in 8 ms (4.9 MiB/s)
          U-Boot# md 0x80050000


I can see change with memory, but screen has no any change, and I measure the signal when I make the instruction of  "fatload mmc 0 0x80050000 tv.bin" with LCD_DATA0~16 have no data message.

Is any wrong with my steps? Thank you.