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According to this Github issue (this is for RPi4, but as long as you have recent versions of bootcode.bin & start.elf the same config.txt parameters should apply) you are correct and uart_2ndstage=1 should enable UART debugging for both Second Stage bootloader (bootcode.bin) and GPU firmware (start.elf): Setting uart_2ndstage=1 causes the second-stage ...


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The "dropping" of bytes happens because not all byte values are directly passed through when reading from /dev/tty.... This depends on the line discipline. $ stty -F /dev/ttyACM1 speed 9600 baud; line = 0; min = 0; time = 0; -icrnl -imaxbel -opost -isig -icanon -iexten -echo Here line = 0 indicates the canonical mode, in which many of the ASCII ...


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You can do it via USB HID, re. the Pico works as a Keyboard, sending data to a connected computer.


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Running bluetoothd with -C and the tool rfcomm are both deprecated and not recommended to use. The official BlueZ example is at: https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/test/test-profile although it still requires a bit of knowledge to get running. Another alternative for the RPi would be the Bluedot RFCOMM functionality: https://www....


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