HiI launched a capture and sensitized the interrupt to both edges.I want to recognize each edge when intraoperating.I mean, to find out which edge was intraverted?I use micro stm32f407vgt

In STM32F407, I get into trouble when I write the scatter file as follows. LR_IROM1 0x08000000 0x00020000 {  ; load region size_region ER_IROM1 0x08000000 0x00020000 { ; load address = execution address  *.o (RESET, +First)  *(InRoot$$Sections)  .ANY...

I want to update the firmware and my micro is a single bank flash memory. Is it possible to do a firmware update with this micro ?? Or should it be dual bank flash memory ??Can I use AT45DB321 as a second memory bank ??