diff --git a/hal/targets.json b/hal/targets.json
index 1444787f3c..22c5b43388 100644
--- a/hal/targets.json
+++ b/hal/targets.json
@@ -624,11 +624,12 @@
         "core": "Cortex-M0",
         "default_toolchain": "uARM",
         "extra_labels": ["STM", "STM32F0", "STM32F031K6"],
+        "macros": ["DEVICE_RTC_LSI=1"],
         "supported_toolchains": ["ARM", "uARM", "IAR", "GCC_ARM"],
         "inherits": ["Target"],
         "progen": {"target": "nucleo-f031k6"},
         "detect_code": ["0791"],
-        "device_has": ["ANALOGIN", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "default_lib": "small",
         "release_versions": ["2"]
     },
@@ -637,11 +638,12 @@
         "core": "Cortex-M0",
         "default_toolchain": "uARM",
         "extra_labels": ["STM", "STM32F0", "STM32F042K6"],
+        "macros": ["DEVICE_RTC_LSI=1"],
         "supported_toolchains": ["ARM", "uARM", "IAR", "GCC_ARM"],
         "inherits": ["Target"],
         "progen": {"target": "nucleo-f042k6"},
         "detect_code": ["0785"],
-        "device_has": ["ANALOGIN", "CAN", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "CAN", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "default_lib": "small",
         "release_versions": ["2"]
     },
@@ -724,12 +726,13 @@
         "core": "Cortex-M4F",
         "default_toolchain": "ARM",
         "extra_labels": ["STM", "STM32F3", "STM32F303K8"],
+        "macros": ["DEVICE_RTC_LSI=1"],
         "supported_toolchains": ["ARM", "uARM", "IAR", "GCC_ARM"],
         "inherits": ["Target"],
         "progen": {"target": "nucleo-f303k8"},
         "detect_code": ["0775"],
         "default_lib": "small",
-        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "release_versions": ["2"]
     },
     "NUCLEO_F303RE": {
@@ -814,8 +817,8 @@
         "extra_labels": ["STM", "STM32F4", "STM32F429", "STM32F429ZI", "STM32F429xx"],
         "supported_toolchains": ["ARM", "uARM", "GCC_ARM", "IAR"],
         "progen": {"target": "nucleo-f429zi"},
-        "macros": ["MBEDTLS_ENTROPY_HARDWARE_ALT"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "macros": ["MBEDTLS_ENTROPY_HARDWARE_ALT", "DEVICE_RTC_LSI=1"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "detect_code": ["0796"],
         "features": ["IPV4"],
         "release_versions": ["2", "5"]
@@ -1022,18 +1025,20 @@
         "core": "Cortex-M4F",
         "default_toolchain": "ARM",
         "extra_labels": ["STM", "STM32F3", "STM32F303", "STM32F303VC"],
+        "macros": ["DEVICE_RTC_LSI=1"],
         "supported_toolchains": ["GCC_ARM"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"]
+        "device_has": ["ANALOGIN", "ANALOGOUT", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"]
     },
     "DISCO_F334C8": {
         "inherits": ["Target"],
         "core": "Cortex-M4F",
         "default_toolchain": "ARM",
         "extra_labels": ["STM", "STM32F3", "STM32F334C8"],
+        "macros": ["DEVICE_RTC_LSI=1"],
         "supported_toolchains": ["ARM", "uARM", "IAR", "GCC_ARM"],
         "progen": {"target": "disco-f334c8"},
         "detect_code": ["0810"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "default_lib": "small",
 	"release_versions": ["2"]
     },
@@ -1050,10 +1055,10 @@
         "core": "Cortex-M4F",
         "default_toolchain": "ARM",
         "extra_labels": ["STM", "STM32F4", "STM32F429", "STM32F429ZI", "STM32F429xx"],
-        "macros": ["MBEDTLS_ENTROPY_HARDWARE_ALT"],
+        "macros": ["MBEDTLS_ENTROPY_HARDWARE_ALT", "DEVICE_RTC_LSI=1"],
         "supported_toolchains": ["ARM", "uARM", "GCC_ARM", "IAR"],
         "progen": {"target": "disco-f429zi"},
-        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SERIAL_ASYNCH", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "release_versions": ["2", "5"]
     },
     "DISCO_F469NI": {
@@ -1148,10 +1153,11 @@
         "core": "Cortex-M3",
         "default_toolchain": "uARM",
         "extra_labels": ["STM", "STM32L1", "STM32L152RC"],
+        "macros": ["DEVICE_RTC_LSI=1"],
         "supported_toolchains": ["ARM", "uARM", "IAR", "GCC_ARM"],
         "progen": {"target": "stm32l151rc"},
         "detect_code": ["4100"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "default_lib": "small",
         "release_versions": ["2"]
     },
@@ -1180,9 +1186,10 @@
         "default_toolchain": "uARM",
         "program_cycle_s": 1.5,
         "extra_labels": ["STM", "STM32L1", "STM32L151RC"],
+        "macros": ["DEVICE_RTC_LSI=1"],
         "supported_toolchains": ["ARM", "uARM", "GCC_ARM"],
         "progen": {"target": "stm32l151rc"},
-        "device_has": ["ANALOGIN", "ANALOGOUT", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "default_lib": "small"
     },
     "MCU_NRF51": {