diff --git a/src/mainboard/amd/birman/Kconfig b/src/mainboard/amd/birman/Kconfig
index 3a9ffc77f1..f690e5e67a 100644
--- a/src/mainboard/amd/birman/Kconfig
+++ b/src/mainboard/amd/birman/Kconfig
@@ -52,15 +52,6 @@ config BIRMAN_HAVE_MCHP_FW
 	bool "Have Microchip EC firmware?"
 	default n
 
-config BIRMAN_MCHP_SIG_FILE
-	string "Microchip EC signature file"
-	depends on BIRMAN_HAVE_MCHP_FW
-	default "3rdparty/blobs/mainboard/amd/birman/EC_birman_sig.bin"
-	help
-	  The EC sig blob is the first 4kBytes of the firmware image.
-	  The first 4 bytes form a pointer (with CRC) to where the EC firmware
-	  is located
-
 config AMD_SOC_CONSOLE_UART
 	default y if !SOC_AMD_COMMON_BLOCK_SIMNOW_BUILD
 
diff --git a/src/mainboard/amd/birman/Makefile.mk b/src/mainboard/amd/birman/Makefile.mk
index a784d1a7fa..aa26adb4fe 100644
--- a/src/mainboard/amd/birman/Makefile.mk
+++ b/src/mainboard/amd/birman/Makefile.mk
@@ -23,10 +23,11 @@ show_notices:: warn_no_apcb
 endif
 
 ifeq ($(CONFIG_BIRMAN_HAVE_MCHP_FW),y)
-$(call add_intermediate, add_mchp_fw)
-	$(CBFSTOOL) $(obj)/coreboot.pre write -r EC_SIG -f $(CONFIG_BIRMAN_MCHP_SIG_FILE) --fill-upward
-	$(CBFSTOOL) $(obj)/coreboot.pre write -r EC_BODY -f $(CONFIG_BIRMAN_MCHP_FW_FILE) --fill-upward
+subdirs-y += ../../../../util/mec152x
 
+$(call add_intermediate, add_mchp_fw, $(objutil)/mec152x/mec152xtool)
+	$(CBFSTOOL) $(obj)/coreboot.pre write -r EC_BODY -f $(CONFIG_BIRMAN_MCHP_FW_FILE) --fill-upward
+	$(objutil)/mec152x/mec152xtool $(obj)/coreboot.pre GEN_ECFW_PTR -f EC_BODY
 else
 show_notices:: warn_no_mchp
 endif # CONFIG_BIRMAN_HAVE_MCHP_FW
diff --git a/src/mainboard/amd/birman_plus/Kconfig b/src/mainboard/amd/birman_plus/Kconfig
index 62d5c29141..a5291a495c 100644
--- a/src/mainboard/amd/birman_plus/Kconfig
+++ b/src/mainboard/amd/birman_plus/Kconfig
@@ -48,15 +48,6 @@ config BIRMANPLUS_HAVE_MCHP_FW
 	bool "Have Microchip EC firmware?"
 	default n
 
-config BIRMANPLUS_MCHP_SIG_FILE
-	string "Microchip EC signature file"
-	depends on BIRMANPLUS_HAVE_MCHP_FW
-	default "3rdparty/blobs/mainboard/amd/birman_plus/EC_birmanplus_sig.bin"
-	help
-	  The EC sig blob is the first 4kBytes of the firmware image.
-	  The first 4 bytes form a pointer (with CRC) to where the EC firmware
-	  is located
-
 config AMD_SOC_CONSOLE_UART
 	default y if !SOC_AMD_COMMON_BLOCK_SIMNOW_BUILD
 
diff --git a/src/mainboard/amd/birman_plus/Makefile.mk b/src/mainboard/amd/birman_plus/Makefile.mk
index 5ef9ed92e3..c025591115 100644
--- a/src/mainboard/amd/birman_plus/Makefile.mk
+++ b/src/mainboard/amd/birman_plus/Makefile.mk
@@ -20,10 +20,11 @@ show_notices:: warn_no_apcb
 endif
 
 ifeq ($(CONFIG_BIRMANPLUS_HAVE_MCHP_FW),y)
-$(call add_intermediate, add_mchp_fw)
-	$(CBFSTOOL) $(obj)/coreboot.pre write -r EC_SIG -f $(CONFIG_BIRMANPLUS_MCHP_SIG_FILE) --fill-upward
-	$(CBFSTOOL) $(obj)/coreboot.pre write -r EC_BODY -f $(CONFIG_BIRMANPLUS_MCHP_FW_FILE) --fill-upward
+subdirs-y += ../../../../util/mec152x
 
+$(call add_intermediate, add_mchp_fw, $(objutil)/mec152x/mec152xtool)
+	$(CBFSTOOL) $(obj)/coreboot.pre write -r EC_BODY -f $(CONFIG_BIRMANPLUS_MCHP_FW_FILE) --fill-upward
+	$(objutil)/mec152x/mec152xtool $(obj)/coreboot.pre GEN_ECFW_PTR -f EC_BODY
 else
 show_notices:: warn_no_mchp
 endif # CONFIG_BIRMAN_HAVE_MCHP_FW
diff --git a/src/mainboard/amd/crater/Kconfig b/src/mainboard/amd/crater/Kconfig
index 11bd6b9cf7..136d1b834c 100644
--- a/src/mainboard/amd/crater/Kconfig
+++ b/src/mainboard/amd/crater/Kconfig
@@ -42,14 +42,6 @@ config CRATER_HAVE_MCHP_FW
 	bool "Have Microchip EC firmware?"
 	default n
 
-config CRATER_MCHP_SIG_FILE
-	string "Microchip EC signature file"
-	depends on CRATER_HAVE_MCHP_FW
-	help
-	  The EC sig blob is the first 4kBytes of the firmware image.
-	  The first 4 bytes form a pointer (with CRC) to where the EC firmware
-	  is located
-
 config AMD_SOC_CONSOLE_UART
 	default y if !SOC_AMD_COMMON_BLOCK_SIMNOW_BUILD
 
diff --git a/src/mainboard/amd/crater/Makefile.mk b/src/mainboard/amd/crater/Makefile.mk
index dc169f1969..3207c59c5c 100644
--- a/src/mainboard/amd/crater/Makefile.mk
+++ b/src/mainboard/amd/crater/Makefile.mk
@@ -18,10 +18,11 @@ show_notices:: warn_no_apcb
 endif
 
 ifeq ($(CONFIG_CRATER_HAVE_MCHP_FW),y)
-$(call add_intermediate, add_mchp_fw)
-	$(CBFSTOOL) $(obj)/coreboot.pre write -r EC_SIG -f $(CONFIG_CRATER_MCHP_SIG_FILE) --fill-upward
-	$(CBFSTOOL) $(obj)/coreboot.pre write -r EC_BODY -f $(CONFIG_CRATER_MCHP_FW_FILE) --fill-upward
+subdirs-y += ../../../../util/mec152x
 
+$(call add_intermediate, add_mchp_fw, $(objutil)/mec152x/mec152xtool)
+	$(CBFSTOOL) $(obj)/coreboot.pre write -r EC_BODY -f $(CONFIG_CRATER_MCHP_FW_FILE) --fill-upward
+	$(objutil)/mec152x/mec152xtool $(obj)/coreboot.pre GEN_ECFW_PTR -f EC_BODY
 else
 show_notices:: warn_no_mchp
 endif