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-rw-r--r--board/rainier/board.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/board/rainier/board.h b/board/rainier/board.h
index ff2a5b26d6..b9b41c0a00 100644
--- a/board/rainier/board.h
+++ b/board/rainier/board.h
@@ -23,6 +23,7 @@
#define CONFIG_SPI
#define CONFIG_SPI_MASTER
#define CONFIG_STM_HWTIMER32
+/* Source RTCCLK from external 32.768kHz source on PC15/OSC32_IN. */
#define CONFIG_STM32_CLOCK_LSE
#define CONFIG_SWITCH
#define CONFIG_WATCHDOG_HELP