diff --git a/arch/powerpc/cpu/74xx_7xx/config.mk b/arch/powerpc/cpu/74xx_7xx/config.mk
index 96812a0..4cd1a26 100644
--- a/arch/powerpc/cpu/74xx_7xx/config.mk
+++ b/arch/powerpc/cpu/74xx_7xx/config.mk
@@ -5,4 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-PLATFORM_CPPFLAGS += -DCONFIG_74xx_7xx -mstring
+PLATFORM_CPPFLAGS += -mstring
diff --git a/arch/powerpc/cpu/mpc512x/config.mk b/arch/powerpc/cpu/mpc512x/config.mk
index 03759e6..5bf1b2a 100644
--- a/arch/powerpc/cpu/mpc512x/config.mk
+++ b/arch/powerpc/cpu/mpc512x/config.mk
@@ -4,4 +4,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-PLATFORM_CPPFLAGS += -DCONFIG_MPC512X -DCONFIG_E300 -msoft-float -mcpu=603e
+PLATFORM_CPPFLAGS += -DCONFIG_E300 -msoft-float -mcpu=603e
diff --git a/arch/powerpc/cpu/mpc5xx/config.mk b/arch/powerpc/cpu/mpc5xx/config.mk
index 31e2dc9..dd2ec37 100644
--- a/arch/powerpc/cpu/mpc5xx/config.mk
+++ b/arch/powerpc/cpu/mpc5xx/config.mk
@@ -5,4 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-PLATFORM_CPPFLAGS += -DCONFIG_5xx -mpowerpc -msoft-float
+PLATFORM_CPPFLAGS += -mpowerpc -msoft-float
diff --git a/arch/powerpc/cpu/mpc5xxx/config.mk b/arch/powerpc/cpu/mpc5xxx/config.mk
index 3384f6f..bcff214 100644
--- a/arch/powerpc/cpu/mpc5xxx/config.mk
+++ b/arch/powerpc/cpu/mpc5xxx/config.mk
@@ -5,5 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-PLATFORM_CPPFLAGS += -DCONFIG_MPC5xxx \
-		     -mstring -mcpu=603e -mmultiple
+PLATFORM_CPPFLAGS += -mstring -mcpu=603e -mmultiple
diff --git a/arch/powerpc/cpu/mpc824x/config.mk b/arch/powerpc/cpu/mpc824x/config.mk
index a224bc8..ecfb07e 100644
--- a/arch/powerpc/cpu/mpc824x/config.mk
+++ b/arch/powerpc/cpu/mpc824x/config.mk
@@ -5,4 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-PLATFORM_CPPFLAGS += -DCONFIG_MPC824X -mstring -mcpu=603e -msoft-float
+PLATFORM_CPPFLAGS += -mstring -mcpu=603e -msoft-float
diff --git a/arch/powerpc/cpu/mpc8260/config.mk b/arch/powerpc/cpu/mpc8260/config.mk
index 59f152d..6a1b6e3 100644
--- a/arch/powerpc/cpu/mpc8260/config.mk
+++ b/arch/powerpc/cpu/mpc8260/config.mk
@@ -5,5 +5,5 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-PLATFORM_CPPFLAGS += -DCONFIG_MPC8260 -DCONFIG_CPM2 \
+PLATFORM_CPPFLAGS += -DCONFIG_CPM2 \
 		     -mstring -mcpu=603e -mmultiple
diff --git a/arch/powerpc/cpu/mpc83xx/config.mk b/arch/powerpc/cpu/mpc83xx/config.mk
index dfce4d5..0c08350 100644
--- a/arch/powerpc/cpu/mpc83xx/config.mk
+++ b/arch/powerpc/cpu/mpc83xx/config.mk
@@ -4,4 +4,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-PLATFORM_CPPFLAGS += -DCONFIG_MPC83xx -DCONFIG_E300 -msoft-float
+PLATFORM_CPPFLAGS += -DCONFIG_E300 -msoft-float
diff --git a/arch/powerpc/cpu/mpc85xx/config.mk b/arch/powerpc/cpu/mpc85xx/config.mk
index 1470f95..72c964c 100644
--- a/arch/powerpc/cpu/mpc85xx/config.mk
+++ b/arch/powerpc/cpu/mpc85xx/config.mk
@@ -5,7 +5,7 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-PLATFORM_CPPFLAGS += -DCONFIG_MPC85xx -Wa,-me500 -msoft-float -mno-string
+PLATFORM_CPPFLAGS += -Wa,-me500 -msoft-float -mno-string
 
 # -mspe=yes is needed to have -mno-spe accepted by a buggy GCC;
 # see "[PATCH,rs6000] make -mno-spe work as expected" on
diff --git a/arch/powerpc/cpu/mpc86xx/config.mk b/arch/powerpc/cpu/mpc86xx/config.mk
index 4c7235f..69a0b96 100644
--- a/arch/powerpc/cpu/mpc86xx/config.mk
+++ b/arch/powerpc/cpu/mpc86xx/config.mk
@@ -5,4 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-PLATFORM_CPPFLAGS += -DCONFIG_MPC86xx -mstring -maltivec -mabi=altivec -msoft-float
+PLATFORM_CPPFLAGS += -mstring -maltivec -mabi=altivec -msoft-float
diff --git a/arch/powerpc/cpu/mpc8xx/config.mk b/arch/powerpc/cpu/mpc8xx/config.mk
index ee2c883..485e43d 100644
--- a/arch/powerpc/cpu/mpc8xx/config.mk
+++ b/arch/powerpc/cpu/mpc8xx/config.mk
@@ -5,4 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-PLATFORM_CPPFLAGS += -DCONFIG_8xx -mstring -mcpu=860 -msoft-float
+PLATFORM_CPPFLAGS += -mstring -mcpu=860 -msoft-float
diff --git a/arch/powerpc/cpu/ppc4xx/config.mk b/arch/powerpc/cpu/ppc4xx/config.mk
index a7253b2..f87c9dc 100644
--- a/arch/powerpc/cpu/ppc4xx/config.mk
+++ b/arch/powerpc/cpu/ppc4xx/config.mk
@@ -5,7 +5,7 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-PLATFORM_CPPFLAGS += -DCONFIG_4xx -mstring -msoft-float
+PLATFORM_CPPFLAGS += -mstring -msoft-float
 
 cfg=$(srctree)/include/configs/$(CONFIG_SYS_CONFIG_NAME:"%"=%).h
 is440:=$(shell grep CONFIG_440 $(cfg))