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How to update eboot(in nand) or reflash the NAND using platform builder?

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Hi

I'm following the steps from http://processors.wiki.ti.com/index.php/WinCE-BSP_ARM-A8_User_Guide#Flashing_the_board_over_Platform_builder

"fter booting the device, download any image (XLDRNAND.bin, EBOOTNAND.bin or NK.bin) to the device to flash it automatically. Make sure to have the IMGNAND environment variable set when building NK.bin if you wish to flash it."

I don't quite get it. I have flashed the NAND using UART3, then boot from NAND and platform builder can debug it now.

Then I wish to update the eboot in NAND using PB. How can I choose the file I download from PB (XLDRNAND.bin, EBOOTNAND.bin or NK.bin), I guess NK.bin always gets downloaded. According to my understanding, eboot is not in nk.bin, so how does boot in NAND get updated?

Maybe something wrong with my understanding?


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