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the interrupt vector in bootload mode

I am write a bootload code now. First I based on the bootload example code in the startware, it works but read code 1byte by 1 byte from SPI flash take too much time, so I plan to use DMA to improve the read speed. But it seems no interrupt support in this project. Can I add the exceptionhandler.s and other *.s file in startware/system_config?  Thanks