esp8266/Makefile: Document "disable" value for UART_OS.

74e6c033 · Paul Sokolovsky · 7ebfe09f · 74e6c033
Commit 74e6c033 authored 9 years ago by Paul Sokolovsky
--- a/esp8266/Makefile
+++ b/esp8266/Makefile
@@ -26,7 +26,7 @@ INC += -I$(BUILD)
 INC += -I$(ESP_SDK)/include

 # UART for "os" messages. 0 is normal UART as used by MicroPython REPL,
-# 1 is debug UART (tx only).
+# 1 is debug UART (tx only), -1 to disable.
 UART_OS = 0

 CFLAGS_XTENSA = -fsingle-precision-constant -Wdouble-promotion \