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add faq for deploying to RP2040 using elf2uf2-rs

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docs/modules/ROOT/pages/faq.adoc
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@ -4,6 +4,19 @@ These are a list of unsorted, commonly asked questions and answers.
Please feel free to add items to link:https://github.com/embassy-rs/embassy/edit/main/docs/modules/ROOT/pages/faq.adoc[this page], especially if someone in the chat answered a question for you!
== How to deploy to RP2040 without a debugging probe.
Install link:https://github.com/JoNil/elf2uf2-rs[elf2uf2-rs] for converting the generated elf binary into a uf2 file.
Configure the runner to use this tool, add this to `.cargo/config.toml`:
[source,toml]
----
[target.'cfg(all(target_arch = "arm", target_os = "none"))']
runner = "elf2uf2-rs --deploy --serial --verbose"
----
The command-line parameters `--deploy` will detect your device and upload the binary, `--serial` starts a serial connection. See the documentation for more info.
== Missing main macro
If you see an error like this: