diff --git a/Kconfig b/Kconfig
index a5ea17d0e3..75fb259853 100644
--- a/Kconfig
+++ b/Kconfig
@@ -12,6 +12,9 @@ rsource "kconfigs/Kconfig.consts"
 # Load feature declarations
 rsource "kconfigs/Kconfig.features"
 
+# Load error symbols
+rsource "kconfigs/Kconfig.errors"
+
 # For now, get used modules as macros from this file (see kconfig.mk)
 osource "$(KCONFIG_GENERATED_DEPENDENCIES)"
 
@@ -33,6 +36,9 @@ rsource "pkg/Kconfig"
 comment "RIOT is in a migration phase."
 comment "Some configuration options may not be here. Use CFLAGS instead."
 
+comment "!! ERROR: There are conflicting modules active !!"
+    depends on ERROR_MODULES_CONFLICT != ""
+
 config TEST_KCONFIG
     bool
     default y if '$(TEST_KCONFIG)' = '1'
diff --git a/boards/stm32f4discovery/Kconfig b/boards/stm32f4discovery/Kconfig
index c18869f17a..c5a92163c4 100644
--- a/boards/stm32f4discovery/Kconfig
+++ b/boards/stm32f4discovery/Kconfig
@@ -27,3 +27,7 @@ config BOARD_STM32F4DISCOVERY
 
     # Various other features (if any)
     select HAS_ARDUINO
+
+config ERROR_MODULES_CONFLICT
+    default "On stm32f4discovery boards there are the same pins for the DAC and/or SPI_0." if MODULE_PERIPH_SPI && MODULE_PERIPH_DAC
+    depends on BOARD_STM32F4DISCOVERY
diff --git a/cpu/atmega_common/Kconfig b/cpu/atmega_common/Kconfig
index 3748434b00..fca23e122b 100644
--- a/cpu/atmega_common/Kconfig
+++ b/cpu/atmega_common/Kconfig
@@ -68,3 +68,7 @@ config HAS_ATMEGA_PCINT3
     bool
     help
         Indicates that the Pin Change Interrupt bank 3 is present.
+
+config ERROR_MODULES_CONFLICT
+    default "On ATmega, the RTC and RTT use to the same hardware timer." if MODULE_PERIPH_RTC && MODULE_PERIPH_RTT
+    depends on CPU_COMMON_ATMEGA
diff --git a/cpu/efm32/Kconfig b/cpu/efm32/Kconfig
index 03f45d03ef..a14d8cccd3 100644
--- a/cpu/efm32/Kconfig
+++ b/cpu/efm32/Kconfig
@@ -37,5 +37,9 @@ config HAS_CPU_EFM32
 config CPU
     default "efm32" if CPU_COMMON_EFM32
 
+config ERROR_MODULES_CONFLICT
+    default "On the EFM32, the RTC and RTT map to the same hardware peripheral." if MODULE_PERIPH_RTC && MODULE_PERIPH_RTT
+    depends on CPU_COMMON_EFM32
+
 orsource "families/*/Kconfig"
 source "$(RIOTCPU)/cortexm_common/Kconfig"
diff --git a/cpu/sam0_common/Kconfig b/cpu/sam0_common/Kconfig
index 9a525df6fc..333e15dc00 100644
--- a/cpu/sam0_common/Kconfig
+++ b/cpu/sam0_common/Kconfig
@@ -28,6 +28,9 @@ if CPU_COMMON_SAM0
 
 rsource "periph/Kconfig"
 
+config ERROR_MODULES_CONFLICT
+    default "On SAM0, the RTC and RTT map to the same hardware peripheral." if MODULE_PERIPH_RTC && MODULE_PERIPH_RTT
+
 endif # CPU_COMMON_SAM0
 
 source "$(RIOTCPU)/cortexm_common/Kconfig"
diff --git a/cpu/stm32/Kconfig b/cpu/stm32/Kconfig
index 324ad8de7a..8a96cde81d 100644
--- a/cpu/stm32/Kconfig
+++ b/cpu/stm32/Kconfig
@@ -32,7 +32,12 @@ config HAS_BOOTLOADER_STM32
     help
         Indicates that the stm32 bootloader is being used.
 
+config ERROR_MODULES_CONFLICT
+    default "On STM32, the RTC and RTT map to the same hardware peripheral." if MODULE_PERIPH_RTC && MODULE_PERIPH_RTT
+    depends on CPU_STM32
+
 orsource "kconfig/*/Kconfig"
 orsource "kconfig/*/Kconfig.lines"
 orsource "kconfig/*/Kconfig.models"
+
 source "$(RIOTCPU)/cortexm_common/Kconfig"
diff --git a/kconfigs/Kconfig.errors b/kconfigs/Kconfig.errors
new file mode 100644
index 0000000000..46ef792405
--- /dev/null
+++ b/kconfigs/Kconfig.errors
@@ -0,0 +1,20 @@
+# Copyright (c) 2020 HAW Hamburg
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+#
+
+# Definition of common error symbols. To indicate an error set the default value
+# to the correspondent symbol guarded with the error condition. e.g.:
+#
+# config ERROR_MODULES_CONFLICT
+#     default "On SAM0 platforms RTT and RTC cannot be set at the same time"
+#     depends on MODULE_PERIPH_RTC && MODULE_PERIPH_RTT && CPU_COMMON_SAM0
+#
+
+config ERROR_MODULES_CONFLICT
+    string
+    help
+        Used to indicate that conflicting modules (i.e. modules that can't be
+        active at the same time) are being used together.