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Starterware/AM4379: display image issue in bootloader

Part Number: AM4379

Tool/software: Starterware

Hi All,

    I use the AM4379 platform with StarterWare.   In order to display image in bootloader,I put the image file into SD card, booting from sd card, then read the image file and copy it to ddr address(0x80000000),  give this address to display.Now the image can be displayed in the bootloader, but after a while the system collapsed, what is the proplem?