diff --git a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32GG_STK3700/TOOLCHAIN_ARM_MICRO/startup_efm32gg.S b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32GG_STK3700/TOOLCHAIN_ARM_MICRO/startup_efm32gg.S
index ea255c483e..14dd79d8bf 100644
--- a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32GG_STK3700/TOOLCHAIN_ARM_MICRO/startup_efm32gg.S
+++ b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32GG_STK3700/TOOLCHAIN_ARM_MICRO/startup_efm32gg.S
@@ -33,7 +33,7 @@ Stack_Size      EQU     0x00000400
 
                 AREA    STACK, NOINIT, READWRITE, ALIGN=3
 Stack_Mem       SPACE   Stack_Size
-__initial_sp
+__initial_sp    EQU     0x20020000
 
 
 ; <h> Heap Configuration
diff --git a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32GG_STK3700/TOOLCHAIN_ARM_STD/startup_efm32gg.S b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32GG_STK3700/TOOLCHAIN_ARM_STD/startup_efm32gg.S
index a39a3fa04b..2d30f82f7c 100644
--- a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32GG_STK3700/TOOLCHAIN_ARM_STD/startup_efm32gg.S
+++ b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32GG_STK3700/TOOLCHAIN_ARM_STD/startup_efm32gg.S
@@ -33,7 +33,7 @@ Stack_Size      EQU     0x00000400
 
                 AREA    STACK, NOINIT, READWRITE, ALIGN=3
 Stack_Mem       SPACE   Stack_Size
-__initial_sp
+__initial_sp    EQU     0x20020000
 
 
 ; <h> Heap Configuration
diff --git a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32HG_STK3400/TOOLCHAIN_ARM_MICRO/startup_efm32hg.S b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32HG_STK3400/TOOLCHAIN_ARM_MICRO/startup_efm32hg.S
index 36f966a9a0..b9627c6d93 100644
--- a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32HG_STK3400/TOOLCHAIN_ARM_MICRO/startup_efm32hg.S
+++ b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32HG_STK3400/TOOLCHAIN_ARM_MICRO/startup_efm32hg.S
@@ -33,7 +33,7 @@ Stack_Size      EQU     0x00000400
 
                 AREA    STACK, NOINIT, READWRITE, ALIGN=3
 Stack_Mem       SPACE   Stack_Size
-__initial_sp
+__initial_sp    EQU     0x20002000
 
 
 ; <h> Heap Configuration
diff --git a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32LG_STK3600/TOOLCHAIN_ARM_MICRO/startup_efm32lg.S b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32LG_STK3600/TOOLCHAIN_ARM_MICRO/startup_efm32lg.S
index 4742186232..da07cfdd5c 100644
--- a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32LG_STK3600/TOOLCHAIN_ARM_MICRO/startup_efm32lg.S
+++ b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32LG_STK3600/TOOLCHAIN_ARM_MICRO/startup_efm32lg.S
@@ -33,7 +33,7 @@ Stack_Size      EQU     0x00000400
 
                 AREA    STACK, NOINIT, READWRITE, ALIGN=3
 Stack_Mem       SPACE   Stack_Size
-__initial_sp
+__initial_sp    EQU     0x20008000
 
 
 ; <h> Heap Configuration
diff --git a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32LG_STK3600/TOOLCHAIN_ARM_STD/startup_efm32lg.S b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32LG_STK3600/TOOLCHAIN_ARM_STD/startup_efm32lg.S
index 9e9f1a71a4..5338a85f96 100644
--- a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32LG_STK3600/TOOLCHAIN_ARM_STD/startup_efm32lg.S
+++ b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32LG_STK3600/TOOLCHAIN_ARM_STD/startup_efm32lg.S
@@ -33,7 +33,7 @@ Stack_Size      EQU     0x00000400
 
                 AREA    STACK, NOINIT, READWRITE, ALIGN=3
 Stack_Mem       SPACE   Stack_Size
-__initial_sp
+__initial_sp    EQU     0x20008000
 
 
 ; <h> Heap Configuration
diff --git a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32WG_STK3800/TOOLCHAIN_ARM_MICRO/startup_efm32wg.S b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32WG_STK3800/TOOLCHAIN_ARM_MICRO/startup_efm32wg.S
index e8725c4118..a6cb226fc8 100644
--- a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32WG_STK3800/TOOLCHAIN_ARM_MICRO/startup_efm32wg.S
+++ b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32WG_STK3800/TOOLCHAIN_ARM_MICRO/startup_efm32wg.S
@@ -33,7 +33,7 @@ Stack_Size      EQU     0x00000400
 
                 AREA    STACK, NOINIT, READWRITE, ALIGN=3
 Stack_Mem       SPACE   Stack_Size
-__initial_sp
+__initial_sp    EQU     0x20008000
 
 
 ; <h> Heap Configuration
diff --git a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32WG_STK3800/TOOLCHAIN_ARM_STD/startup_efm32wg.S b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32WG_STK3800/TOOLCHAIN_ARM_STD/startup_efm32wg.S
index 9dab46b7b7..6bd0b0a140 100644
--- a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32WG_STK3800/TOOLCHAIN_ARM_STD/startup_efm32wg.S
+++ b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32WG_STK3800/TOOLCHAIN_ARM_STD/startup_efm32wg.S
@@ -33,7 +33,7 @@ Stack_Size      EQU     0x00000400
 
                 AREA    STACK, NOINIT, READWRITE, ALIGN=3
 Stack_Mem       SPACE   Stack_Size
-__initial_sp
+__initial_sp    EQU     0x20008000
 
 
 ; <h> Heap Configuration
diff --git a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32ZG_STK3200/TOOLCHAIN_ARM_MICRO/startup_efm32zg.S b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32ZG_STK3200/TOOLCHAIN_ARM_MICRO/startup_efm32zg.S
index 8e32b53a73..3ee52b93ed 100644
--- a/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32ZG_STK3200/TOOLCHAIN_ARM_MICRO/startup_efm32zg.S
+++ b/libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32ZG_STK3200/TOOLCHAIN_ARM_MICRO/startup_efm32zg.S
@@ -33,7 +33,7 @@ Stack_Size      EQU     0x00000200
 
                 AREA    STACK, NOINIT, READWRITE, ALIGN=3
 Stack_Mem       SPACE   Stack_Size
-__initial_sp
+__initial_sp    EQU     0x20001000
 
 
 ; <h> Heap Configuration