trezor-firmware
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Use entropy from the SD card when generating backup mnemonic
We currently use some randomness from the host when resetting Trezor. See reset_device.py. If a file [TBD] is on SD card, we could also add that into the mix.
This is especially convenient, if we plan to support Trezor reset without computer (powerbank mode). Then we are loosing the entropy provided by the host, which this would substitute.
Closely related to https://github.com/trezor/trezor-firmware/issues/307