lib/littlefs: Add README describing origin and how to gen lfs1/lfs2.
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littlefs library
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================
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The upstream source for the files in this directory is
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https://github.com/ARMmbed/littlefs
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To generate the separate files with lfs1 and lfs2 prefixes run the following
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commands in the top-level directory of the littlefs repository (replace the
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version tags with the latest/desired ones, and set `$MPY_DIR`):
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git checkout v1.7.2
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python2 ./scripts/prefix.py lfs1
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cp lfs1*.[ch] $MPY_DIR/lib/littlefs
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git reset --hard HEAD
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git checkout v2.1.3
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python2 ./scripts/prefix.py lfs2
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cp lfs2*.[ch] $MPY_DIR/lib/littlefs
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git reset --hard HEAD
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