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Create FLASHLAYOUT.md

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# Fomu
| Hex Address | Decimal Address | Used by | Purpose |
|---:|---:|---|---|
| 0x0000a0 | 160 | HDL in multiboot header | The image loaded at first boot, DFU bootloader image |
| 0x0000a0 | 160 | HDL in multiboot header | The first image for SB_WARMBOOT, DFU bootloader image |
| 0x01a000 | 106496 | main.c as FBM_OFFSET | Used to contain user s/w, is loaded over DFU s/w if found and touch not pressed |
| 0x026800 | 157696 | The second image for SB_WARMBOOT |
| 0x040000 | 262144 | The third image for SB_WARMBOOT |
| 0x048000 | 294912 | The third image for SB_WARMBOOT |
| 0x1FFFFF | 20097151 | End of flash |