config txt

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Boot from USB

Add

program_usb_boot_mode=1

to the bottom of /boot/config.txt and boot once from a sd card. Check by running:

vcgencmd otp_dump | grep 17:

Enable UART

enable_uart=1

To enable the login console on the uart, also add: console=serial0,115200 to cmdline.txt The above seems to be cmdline seems to be default, you can disable it using raspi-config.

Default configuration:

full uart --> bluetooth
mini uart --> gpio header

To swap this, add

dtoverlay=miniuart-bt

to config.txt

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