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Design over-the-air firmware updates — dual-bank, delta updates, rollback, and secure update verification
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Showing SKILL.md
| name | ota-updates |
| description | Design over-the-air firmware updates — dual-bank, delta updates, rollback, and secure update verification |
| allowed-tools | ["Read","Write","Grep"] |
| effort | high |
OTA Update Flow: Dual-Bank
Flash Layout:
0x08000000: Bootloader (16KB) — never updated via OTA
0x08004000: App Bank A (240KB) — currently running
0x08040000: App Bank B (240KB) — update target
0x0807C000: Config (16KB) — boot flag, version, attempt counter
Update Sequence:
1. Download firmware to Bank B (chunked, with CRC per chunk)
2. Verify Bank B image signature (ECDSA-P256)
3. Set boot flag = Bank B, attempt counter = 3
4. Reboot → Bootloader loads Bank B
5. Bank B firmware confirms: set attempt counter = 0
6. If not confirmed after 3 reboots → rollback to Bank A