7 files changed, 11 insertions, 7 deletions
diff --git a/src/mainboard/google/bolt/Makefile.inc b/src/mainboard/google/bolt/Makefile.inc
index e6c6eb3197..20b83ae543 100644
--- a/src/mainboard/google/bolt/Makefile.inc
+++ b/src/mainboard/google/bolt/Makefile.inc
@@ -36,7 +36,7 @@ SPD_DEPS := $(foreach f, $(SPD_SOURCES), src/mainboard/$(MAINBOARDDIR)/$(f).spd.
 $(SPD_BIN): $(SPD_DEPS)
 	for f in $+; \
 	  do for c in $$(cat $$f | grep -v ^#); \
-	    do echo -e -n "\\x$$c"; \
+	    do printf $$(printf '\%o' 0x$$c); \
 	  done; \
 	done > $@
 
diff --git a/src/mainboard/google/falco/Makefile.inc b/src/mainboard/google/falco/Makefile.inc
index fbc24622ba..d644eeedd2 100644
--- a/src/mainboard/google/falco/Makefile.inc
+++ b/src/mainboard/google/falco/Makefile.inc
@@ -44,7 +44,7 @@ SPD_DEPS := $(foreach f, $(SPD_SOURCES), src/mainboard/$(MAINBOARDDIR)/$(f).spd.
 $(SPD_BIN): $(SPD_DEPS)
 	for f in $+; \
 	  do for c in $$(cat $$f | grep -v ^#); \
-	    do echo -e -n "\\x$$c"; \
+	    do printf $$(printf '\%o' 0x$$c); \
 	  done; \
 	done > $@
 
diff --git a/src/mainboard/google/link/Makefile.inc b/src/mainboard/google/link/Makefile.inc
index 62746adbea..bd2cbf5842 100644
--- a/src/mainboard/google/link/Makefile.inc
+++ b/src/mainboard/google/link/Makefile.inc
@@ -37,7 +37,11 @@ SPD_DEPS := $(foreach f, $(SPD_SOURCES), src/mainboard/$(MAINBOARDDIR)/$(f).spd.
 
 # Include spd rom data
 $(SPD_BIN): $(SPD_DEPS)
-	for f in $^; do for c in $$(cat $$f); do echo -e -n "\\x$$c"; done; done > $@
+	for f in $+; \
+	  do for c in $$(cat $$f | grep -v ^#); \
+	    do printf $$(printf '\%o' 0x$$c); \
+	  done; \
+	done > $@
 
 cbfs-files-y += spd.bin
 spd.bin-file := $(SPD_BIN)
diff --git a/src/mainboard/google/peppy/Makefile.inc b/src/mainboard/google/peppy/Makefile.inc
index 96c63f0f9c..30497a2cdf 100644
--- a/src/mainboard/google/peppy/Makefile.inc
+++ b/src/mainboard/google/peppy/Makefile.inc
@@ -43,7 +43,7 @@ SPD_DEPS := $(foreach f, $(SPD_SOURCES), src/mainboard/$(MAINBOARDDIR)/$(f).spd.
 $(SPD_BIN): $(SPD_DEPS)
 	for f in $+; \
 	  do for c in $$(cat $$f | grep -v ^#); \
-	    do echo -e -n "\\x$$c"; \
+	    do printf $$(printf '\%o' 0x$$c); \
 	  done; \
 	done > $@
 
diff --git a/src/mainboard/google/rambi/spd/Makefile.inc b/src/mainboard/google/rambi/spd/Makefile.inc
index 2e7d75025a..375cc9170d 100644
--- a/src/mainboard/google/rambi/spd/Makefile.inc
+++ b/src/mainboard/google/rambi/spd/Makefile.inc
@@ -40,7 +40,7 @@ SPD_DEPS := $(foreach f, $(SPD_SOURCES), src/mainboard/$(MAINBOARDDIR)/spd/$(f).
 $(SPD_BIN): $(SPD_DEPS)
 	for f in $+; \
 	  do for c in $$(cat $$f | grep -v ^#); \
-	    do echo -e -n "\\x$$c"; \
+	    do printf $$(printf '\%o' 0x$$c); \
 	  done; \
 	done > $@
 
diff --git a/src/mainboard/google/samus/spd/Makefile.inc b/src/mainboard/google/samus/spd/Makefile.inc
index df63118bed..be6740dd4b 100644
--- a/src/mainboard/google/samus/spd/Makefile.inc
+++ b/src/mainboard/google/samus/spd/Makefile.inc
@@ -45,7 +45,7 @@ SPD_DEPS := $(foreach f, $(SPD_SOURCES), src/mainboard/$(MAINBOARDDIR)/spd/$(f).
 $(SPD_BIN): $(SPD_DEPS)
 	for f in $+; \
 	  do for c in $$(cat $$f | grep -v ^#); \
-	    do echo -e -n "\\x$$c"; \
+	    do printf $$(printf '\%o' 0x$$c); \
 	  done; \
 	done > $@
 
diff --git a/src/mainboard/google/slippy/Makefile.inc b/src/mainboard/google/slippy/Makefile.inc
index ec75717df5..ddac6ee349 100644
--- a/src/mainboard/google/slippy/Makefile.inc
+++ b/src/mainboard/google/slippy/Makefile.inc
@@ -37,7 +37,7 @@ SPD_DEPS := $(foreach f, $(SPD_SOURCES), src/mainboard/$(MAINBOARDDIR)/$(f).spd.
 $(SPD_BIN): $(SPD_DEPS)
 	for f in $+; \
 	  do for c in $$(cat $$f | grep -v ^#); \
-	    do echo -e -n "\\x$$c"; \
+	    do printf $$(printf '\%o' 0x$$c); \
 	  done; \
 	done > $@