On panic, the USB boot mode implemented in ROM will be
called, providing access for UF2 uploads and picotool.
Just add this to your main.rs:
use rp2040_panic_usb_boot as _;
Before rebooting, XIP caching is disabled and panic messages are written to the XIP RAM.
That way, the panic message can be read using picotool, eg.:
picotool save -r 0x15000000 0x15004000 message.bin
strings message.bin | head
RAM contents can be read the same way, by reading from
address 0x20000000.
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2.0 License. That means you can choose either the MIT license or the
Apache-2.0 license when you re-use this code. See MIT or APACHE2.0 for more
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