diff --git a/package/base-files/Makefile b/package/base-files/Makefile
index 156e7bc8b9..f1f0f17a60 100644
--- a/package/base-files/Makefile
+++ b/package/base-files/Makefile
@@ -12,7 +12,7 @@ include $(INCLUDE_DIR)/version.mk
 include $(INCLUDE_DIR)/feeds.mk
 
 PKG_NAME:=base-files
-PKG_RELEASE:=218
+PKG_RELEASE:=219
 PKG_FLAGS:=nonshared
 
 PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/
diff --git a/package/base-files/files/lib/functions/caldata.sh b/package/base-files/files/lib/functions/caldata.sh
index 3bdb1e4dd5..5e969e3409 100644
--- a/package/base-files/files/lib/functions/caldata.sh
+++ b/package/base-files/files/lib/functions/caldata.sh
@@ -60,15 +60,21 @@ caldata_from_file() {
 	local source=$1
 	local offset=$(($2))
 	local count=$(($3))
+	local target=$4
 
-	dd if=$source of=/lib/firmware/$FIRMWARE iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
+	[ -n "$target" ] || target=/lib/firmware/$FIRMWARE
+
+	dd if=$source of=$target iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
 		caldata_die "failed to extract calibration data from $source"
 }
 
 caldata_valid() {
 	local expected="$1"
+	local target=$2
 
-	magic=$(hexdump -v -n 2 -e '1/1 "%02x"' /lib/firmware/$FIRMWARE)
+	[ -n "$target" ] || target=/lib/firmware/$FIRMWARE
+
+	magic=$(hexdump -v -n 2 -e '1/1 "%02x"' $target)
 	[ "$magic" = "$expected" ]
 	return $?
 }
@@ -77,6 +83,7 @@ caldata_patch_chksum() {
 	local mac=$1
 	local mac_offset=$(($2))
 	local chksum_offset=$(($3))
+	local target=$4
 	local xor_mac
 	local xor_fw_mac
 	local xor_fw_chksum
@@ -91,38 +98,44 @@ caldata_patch_chksum() {
 	xor_fw_chksum=$(xor $xor_fw_chksum $xor_fw_mac $xor_mac)
 
 	printf "%b" "\x${xor_fw_chksum:0:2}\x${xor_fw_chksum:2:2}" | \
-		dd of=/lib/firmware/$FIRMWARE conv=notrunc bs=1 seek=$chksum_offset count=2
+		dd of=$target conv=notrunc bs=1 seek=$chksum_offset count=2
 }
 
 caldata_patch_mac() {
 	local mac=$1
 	local mac_offset=$(($2))
 	local chksum_offset=$3
+	local target=$4
 
 	[ -z "$mac" -o -z "$mac_offset" ] && return
 
-	[ -n "$chksum_offset" ] && caldata_patch_chksum "$mac" "$mac_offset" "$chksum_offset"
+	[ -n "$target" ] || target=/lib/firmware/$FIRMWARE
 
-	macaddr_2bin $mac | dd of=/lib/firmware/$FIRMWARE conv=notrunc oflag=seek_bytes bs=6 seek=$mac_offset count=1 || \
+	[ -n "$chksum_offset" ] && caldata_patch_chksum "$mac" "$mac_offset" "$chksum_offset" "$target"
+
+	macaddr_2bin $mac | dd of=$target conv=notrunc oflag=seek_bytes bs=6 seek=$mac_offset count=1 || \
 		caldata_die "failed to write MAC address to eeprom file"
 }
 
 ath9k_patch_mac() {
 	local mac=$1
+	local target=$2
 
-	caldata_patch_mac "$mac" 0x2
+	caldata_patch_mac "$mac" 0x2 "" "$target"
 }
 
 ath9k_patch_mac_crc() {
 	local mac=$1
 	local mac_offset=$2
 	local chksum_offset=$((mac_offset - 10))
+	local target=$4
 
-	caldata_patch_mac "$mac" "$mac_offset" "$chksum_offset"
+	caldata_patch_mac "$mac" "$mac_offset" "$chksum_offset" "$target"
 }
 
 ath10k_patch_mac() {
 	local mac=$1
+	local target=$2
 
-	caldata_patch_mac "$mac" 0x6 0x2
+	caldata_patch_mac "$mac" 0x6 0x2 "$target"
 }