
Dual-Bank Flash Swaps: Preventing Unrecoverable Bricks During Power Interruption Mid-A/B Update
Every embedded engineer has experienced the cold sweat of a potential field failure. Imagine a fleet of remote industrial sensors, automotive ECUs, or medical devices deployed across thousands of customer sites. An Over-The-Air (OTA) firmware update is broadcast across the network. Midway through writing the new binary image into internal flash memory, a power failure occurs—a drained battery, a grid brownout, or an operator accidentally pulling the plug. If the system relies on a traditional single-bank flash memory architecture, this single event can be catastrophic. The existing application code is partially erased or corrupted, leaving the device stranded in an incomplete bootloader loop or completely unresponsive—a state known as "bricking". Recovering thousands of bricked devices in the field requires expensive manual intervention, physical JTAG re-flashing, or costly RMA returns.
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