This command is used to write data from memory to flash. There is no cross-checking to ensure that the area being written to does not correspond to an existing image.
Write an area of data to the flash
RedBoot> fis write -b 0x0606f000 -l 0x1000 -f 0x00020000 * CAUTION * about to program FLASH at 0x00020000..0x0002ffff from 0x0606f000 - continue (y/n)? y ... Erase from 0x00020000-0x00030000: . ... Program from 0x0606f000-0x0607f000 at 0x00020000: .