What is the "bug" that was corrected for 2MB flash on the FMUv3?

[Zipdox2]

The PX4 docs read:

FMUv3 open hardware design, which corrects a bug that limited the original Pixhawk 1 to 1MB of flash.

What is this bug? Is it just replacing the MCU, which I assume was the STM32F427VG (can't find a barebones picture), with a STM32F427VI, which has 2MB flash? Or is there something else?

[hamishwillee]

IT was this: https://docs.px4.io/main/en/flight_controller/silicon_errata.html#fmuv2-pixhawk-silicon-errata

[proficnc]

A bug with FMUv2 wasn't fixed. The chip used on FMUv3 was a newer version where the hardware issues had been resolved.

When I designed FMUv3, it was specifically for Pixhawk 2.0 (which became the cube)

FMUv3 later got modified to accommodate fmuv2 PCBs with the updated chip.

I would be very surprised if there are still 1M issue stm32F427 out there. Even on Pixhawk 1 clones.

[Zipdox2]

So if I were to build the FMUv2 PCB with new STM32F427 chips I would be able to use the full 2MB?