Issue with boot loader

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I am using OMAP3515 processor (Generic CortexA8 Device) for my project and want to boot the system form UART3. The boot loader code which I am using is working fine when using emulator i.e it is able to write the image into FLASH. The same boot loader code when I am sending through UART it is executing in RAM but unable to write the image into FLASH.

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You may need to unlock the flash. Some systems provide a option to lock and unlock flash.