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write_all and inlining lower level uart registry functions. This saves about 20 bytes.
memcopy. direct 2x32bit word copy instead of looping through 8 bytes. Saves 16 bytes.
are ever only called once.
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This PR squeezed an extra 194 bytes out of the binary without losing features. We now have 236 bytes extra to implement buffered fast writes + flush.
Binary size is like toothpaste. If you squeeze hard enough, there will still be more.