diff --git a/board/bct-brettl2/config.mk b/board/bct-brettl2/config.mk
index 799a682..b3ed337 100644
--- a/board/bct-brettl2/config.mk
+++ b/board/bct-brettl2/config.mk
@@ -25,3 +25,4 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
diff --git a/board/bf518f-ezbrd/config.mk b/board/bf518f-ezbrd/config.mk
index 799a682..b3ed337 100644
--- a/board/bf518f-ezbrd/config.mk
+++ b/board/bf518f-ezbrd/config.mk
@@ -25,3 +25,4 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
diff --git a/board/bf526-ezbrd/config.mk b/board/bf526-ezbrd/config.mk
index 799a682..b3ed337 100644
--- a/board/bf526-ezbrd/config.mk
+++ b/board/bf526-ezbrd/config.mk
@@ -25,3 +25,4 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
diff --git a/board/bf527-ad7160-eval/config.mk b/board/bf527-ad7160-eval/config.mk
index 799a682..b3ed337 100644
--- a/board/bf527-ad7160-eval/config.mk
+++ b/board/bf527-ad7160-eval/config.mk
@@ -25,3 +25,4 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
diff --git a/board/bf527-ezkit/config.mk b/board/bf527-ezkit/config.mk
index 799a682..b3ed337 100644
--- a/board/bf527-ezkit/config.mk
+++ b/board/bf527-ezkit/config.mk
@@ -25,3 +25,4 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
diff --git a/board/bf527-sdp/config.mk b/board/bf527-sdp/config.mk
index 7271774..beb4651 100644
--- a/board/bf527-sdp/config.mk
+++ b/board/bf527-sdp/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16 --dma 6
diff --git a/board/bf533-ezkit/config.mk b/board/bf533-ezkit/config.mk
index c0cb9ff..7d1fc44 100644
--- a/board/bf533-ezkit/config.mk
+++ b/board/bf533-ezkit/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16 --dma 8
diff --git a/board/bf533-stamp/config.mk b/board/bf533-stamp/config.mk
index c0cb9ff..7d1fc44 100644
--- a/board/bf533-stamp/config.mk
+++ b/board/bf533-stamp/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16 --dma 8
diff --git a/board/bf537-stamp/config.mk b/board/bf537-stamp/config.mk
index 7c023d1..0adae73 100644
--- a/board/bf537-stamp/config.mk
+++ b/board/bf537-stamp/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16 --dma 8
diff --git a/board/bf538f-ezkit/config.mk b/board/bf538f-ezkit/config.mk
index c0cb9ff..7d1fc44 100644
--- a/board/bf538f-ezkit/config.mk
+++ b/board/bf538f-ezkit/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16 --dma 8
diff --git a/board/bf548-ezkit/config.mk b/board/bf548-ezkit/config.mk
index 7f38b14..ab3ff14 100644
--- a/board/bf548-ezkit/config.mk
+++ b/board/bf548-ezkit/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA       := --dma 6
diff --git a/board/bf561-acvilon/config.mk b/board/bf561-acvilon/config.mk
index 4c811ba..4d6184e 100644
--- a/board/bf561-acvilon/config.mk
+++ b/board/bf561-acvilon/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16
diff --git a/board/bf561-ezkit/config.mk b/board/bf561-ezkit/config.mk
index 4c811ba..4d6184e 100644
--- a/board/bf561-ezkit/config.mk
+++ b/board/bf561-ezkit/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16
diff --git a/board/cm-bf527/config.mk b/board/cm-bf527/config.mk
index 799a682..b3ed337 100644
--- a/board/cm-bf527/config.mk
+++ b/board/cm-bf527/config.mk
@@ -25,3 +25,4 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
diff --git a/board/cm-bf533/config.mk b/board/cm-bf533/config.mk
index c0cb9ff..7d1fc44 100644
--- a/board/cm-bf533/config.mk
+++ b/board/cm-bf533/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16 --dma 8
diff --git a/board/cm-bf537e/config.mk b/board/cm-bf537e/config.mk
index c0cb9ff..7d1fc44 100644
--- a/board/cm-bf537e/config.mk
+++ b/board/cm-bf537e/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16 --dma 8
diff --git a/board/cm-bf537u/config.mk b/board/cm-bf537u/config.mk
index c0cb9ff..7d1fc44 100644
--- a/board/cm-bf537u/config.mk
+++ b/board/cm-bf537u/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16 --dma 8
diff --git a/board/cm-bf548/config.mk b/board/cm-bf548/config.mk
index 5adb6fc..358e4c1 100644
--- a/board/cm-bf548/config.mk
+++ b/board/cm-bf548/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA       := --dma 6
diff --git a/board/cm-bf561/config.mk b/board/cm-bf561/config.mk
index 4c811ba..4d6184e 100644
--- a/board/cm-bf561/config.mk
+++ b/board/cm-bf561/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16
diff --git a/board/ip04/config.mk b/board/ip04/config.mk
index 7c023d1..0adae73 100644
--- a/board/ip04/config.mk
+++ b/board/ip04/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16 --dma 8
diff --git a/board/tcm-bf518/config.mk b/board/tcm-bf518/config.mk
index 799a682..b3ed337 100644
--- a/board/tcm-bf518/config.mk
+++ b/board/tcm-bf518/config.mk
@@ -25,3 +25,4 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
diff --git a/board/tcm-bf537/config.mk b/board/tcm-bf537/config.mk
index c0cb9ff..7d1fc44 100644
--- a/board/tcm-bf537/config.mk
+++ b/board/tcm-bf537/config.mk
@@ -25,6 +25,7 @@
 
 CFLAGS_lib += -O2
 CFLAGS_lib/lzma += -O2
+CFLAGS_lib/zlib += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16 --dma 8