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Bootloader in Flash and application in RAM.

Hi All,
I have a plan to put the boot-loader and load many applications less than 32 KBytes. I am wondering that is it possible that boot-loader code is on flash and I copy the application from external flash to RAM and execute it?

How long does it take to copy 32 Kbytes from external flash (maximum) to RAM and execute it? I think that it should be less than 0.5 second. I just want to know and then write a sample.

My architecture is LPC1788 with 1Gbit of external flash.

Thank you so much for your help and support.