esp8266/README: comment on the specific binary SDK used
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@ -34,6 +34,14 @@ run `make` in its directory to build and install the SDK locally. Make sure
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to add toolchain bin directory to your PATH. Read esp-open-sdk's README for
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additional important information on toolchain setup.
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Travis builds, including releases are actually built using a specific
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esp-open-sdk binary. The location of the binary can be seen in the
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`.travis.yml` in the top-level directory of CircuitPython. This may be ahead
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of or behind the pfalcon repository, depending on the specific needs of
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CircuitPython. If your local system is binary-compatible with Travis
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(most Ubuntu and Debian based systems are), you can download the binary and
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skip building it locally.
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Add the external dependencies to the MicroPython repository checkout:
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```bash
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$ git submodule update --init
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