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esp8266/Makefile
@@ -26,7 +26,7 @@ INC += -I$(BUILD)
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INC += -I$(ESP_SDK)/include
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# UART for "os" messages. 0 is normal UART as used by MicroPython REPL,
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-# 1 is debug UART (tx only).
+# 1 is debug UART (tx only), -1 to disable.
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UART_OS = 0
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CFLAGS_XTENSA = -fsingle-precision-constant -Wdouble-promotion \
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