diff --git a/package/base-files/files/lib/functions.sh b/package/base-files/files/lib/functions.sh
index 860fc04510..81176431d1 100755
--- a/package/base-files/files/lib/functions.sh
+++ b/package/base-files/files/lib/functions.sh
@@ -17,6 +17,22 @@ NO_EXPORT=1
 LOAD_STATE=1
 LIST_SEP=" "
 
+# xor multiple hex values of the same length
+xor() {
+	local val
+	local ret="0x$1"
+	local retlen=${#1}
+
+	shift
+	while [ -n "$1" ]; do
+		val="0x$1"
+		ret=$((ret ^ val))
+		shift
+	done
+
+	printf "%0${retlen}x" "$ret"
+}
+
 append() {
 	local var="$1"
 	local value="$2"
diff --git a/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom b/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
index f07dbf83c4..450f85b0fe 100644
--- a/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
+++ b/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
@@ -42,21 +42,6 @@ ath9k_eeprom_extract_reverse() {
 	printf "%b" "$caldata" > /lib/firmware/$FIRMWARE
 }
 
-xor() {
-	local val
-	local ret="0x$1"
-	local retlen=${#1}
-
-	shift
-	while [ -n "$1" ]; do
-		val="0x$1"
-		ret=$((ret ^ val))
-		shift
-	done
-
-	printf "%0${retlen}x" "$ret"
-}
-
 ath9k_patch_fw_mac() {
 	local mac=$1
 	local mac_offset=$(($2))
diff --git a/target/linux/ath79/base-files/etc/hotplug.d/firmware/11-ath10k-caldata b/target/linux/ath79/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
index ed3432273c..6e79094e0c 100644
--- a/target/linux/ath79/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
+++ b/target/linux/ath79/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
@@ -1,23 +1,8 @@
 #!/bin/sh
 
+. /lib/functions.sh
 . /lib/functions/k2t.sh
 
-# xor multiple hex values of the same length
-xor() {
-	local val
-	local ret="0x$1"
-	local retlen=${#1}
-
-	shift
-	while [ -n "$1" ]; do
-		val="0x$1"
-		ret=$((ret ^ val))
-		shift
-	done
-
-	printf "%0${retlen}x" "$ret"
-}
-
 ath10kcal_die() {
 	echo "ath10cal: " "$*"
 	exit 1
@@ -79,7 +64,6 @@ ath10kcal_patch_mac_crc() {
 
 [ -e /lib/firmware/$FIRMWARE ] && exit 0
 
-. /lib/functions.sh
 . /lib/functions/system.sh
 
 board=$(board_name)
diff --git a/target/linux/ipq40xx/base-files/etc/hotplug.d/firmware/11-ath10k-caldata b/target/linux/ipq40xx/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
index be57646128..dfb0a0cf76 100644
--- a/target/linux/ipq40xx/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
+++ b/target/linux/ipq40xx/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
@@ -1,20 +1,6 @@
 #!/bin/sh
 
-# xor multiple hex values of the same length
-xor() {
-	local val
-	local ret="0x$1"
-	local retlen=${#1}
-
-	shift
-	while [ -n "$1" ]; do
-		val="0x$1"
-		ret=$((ret ^ val))
-		shift
-	done
-
-	printf "%0${retlen}x" "$ret"
-}
+. /lib/functions.sh
 
 ath10kcal_die() {
 	echo "ath10cal: " "$*"
@@ -88,7 +74,6 @@ ath10kcal_is_caldata_valid() {
 
 [ -e /lib/firmware/$FIRMWARE ] && exit 0
 
-. /lib/functions.sh
 . /lib/functions/system.sh
 
 board=$(board_name)
diff --git a/target/linux/ipq806x/base-files/etc/hotplug.d/firmware/11-ath10k-caldata b/target/linux/ipq806x/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
index bdc36070f2..c0fb1db16d 100644
--- a/target/linux/ipq806x/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
+++ b/target/linux/ipq806x/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
@@ -1,20 +1,6 @@
 #!/bin/sh
 
-# xor multiple hex values of the same length
-xor() {
-	local val
-	local ret="0x$1"
-	local retlen=${#1}
-
-	shift
-	while [ -n "$1" ]; do
-		val="0x$1"
-		ret=$((ret ^ val))
-		shift
-	done
-
-	printf "%0${retlen}x" "$ret"
-}
+. /lib/functions.sh
 
 ath10kcal_die() {
 	echo "ath10cal: " "$*"
@@ -71,7 +57,6 @@ ath10kcal_patch_mac_crc() {
 
 [ -e /lib/firmware/$FIRMWARE ] && exit 0
 
-. /lib/functions.sh
 . /lib/functions/system.sh
 
 board=$(board_name)
diff --git a/target/linux/lantiq/base-files/etc/hotplug.d/firmware/12-ath9k-eeprom b/target/linux/lantiq/base-files/etc/hotplug.d/firmware/12-ath9k-eeprom
index 82f6885221..5f3eb0cfe3 100644
--- a/target/linux/lantiq/base-files/etc/hotplug.d/firmware/12-ath9k-eeprom
+++ b/target/linux/lantiq/base-files/etc/hotplug.d/firmware/12-ath9k-eeprom
@@ -7,22 +7,6 @@
 . /lib/functions/system.sh
 . /lib/upgrade/nand.sh
 
-# xor multiple hex values of the same length
-xor() {
-	local val
-	local ret="0x$1"
-	local retlen=${#1}
-
-	shift
-	while [ -n "$1" ]; do
-		val="0x$1"
-		ret=$((ret ^ val))
-		shift
-	done
-
-	printf "%0${retlen}x" "$ret"
-}
-
 ath9k_eeprom_die() {
 	echo "ath9k eeprom: $*"
 	exit 1
