3 ms·
Those Bouffalo Lab chips are self-destructing, there's no write protect for the EFuse bits, one wrong register write and the chip's locked in secure boot mode a
by 127361 3y ago
Those Bouffalo Lab chips are self-destructing, there's no write protect for the EFuse bits, one wrong register write and the chip's locked in secure boot mode and thus dead. Go for Beken instead, they designed the EFuse controller sensibly - and are based on the same CEVA RivieraWaves IP.
- eschneider 3y agoThat's a feature, depending on your application. If you (intentionally) blow the secure boot fuses, you want it to _stay_ in secure boot mode.
- 127361 3y agoBut there should be a way to lock those fuses before shipping the product to market. Otherwise the device can be permanently bricked and the hardware will need to be replaced. On Espressif and Beken chips these fuses are lockable. Once locked, they can never be written to again.