Kconfig: comply to Linux 5.3's Kconfig language rules

Kconfig became stricter on what it accepts, so accomodate before
updating to a new release.

Change-Id: I92a9e9bf0d557a7532ba533cd7776c48f2488f91
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37156
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/mainboard/amd/bettong/Kconfig b/src/mainboard/amd/bettong/Kconfig
index eaebfb5..5f26e87 100644
--- a/src/mainboard/amd/bettong/Kconfig
+++ b/src/mainboard/amd/bettong/Kconfig
@@ -30,7 +30,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/bettong
+	default "amd/bettong"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/amd/db-ft3b-lc/Kconfig b/src/mainboard/amd/db-ft3b-lc/Kconfig
index ffb3f10..256b555 100644
--- a/src/mainboard/amd/db-ft3b-lc/Kconfig
+++ b/src/mainboard/amd/db-ft3b-lc/Kconfig
@@ -31,7 +31,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/db-ft3b-lc
+	default "amd/db-ft3b-lc"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/amd/gardenia/Kconfig b/src/mainboard/amd/gardenia/Kconfig
index 7adc678..02e3e95 100644
--- a/src/mainboard/amd/gardenia/Kconfig
+++ b/src/mainboard/amd/gardenia/Kconfig
@@ -26,7 +26,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/gardenia
+	default "amd/gardenia"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/amd/inagua/Kconfig b/src/mainboard/amd/inagua/Kconfig
index 6d6ec4f..e24af40 100644
--- a/src/mainboard/amd/inagua/Kconfig
+++ b/src/mainboard/amd/inagua/Kconfig
@@ -30,7 +30,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/inagua
+	default "amd/inagua"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/amd/lamar/Kconfig b/src/mainboard/amd/lamar/Kconfig
index 210b3c2..025e5ff 100644
--- a/src/mainboard/amd/lamar/Kconfig
+++ b/src/mainboard/amd/lamar/Kconfig
@@ -31,7 +31,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/lamar
+	default "amd/lamar"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/amd/olivehill/Kconfig b/src/mainboard/amd/olivehill/Kconfig
index 066d967..bd9a2fe 100644
--- a/src/mainboard/amd/olivehill/Kconfig
+++ b/src/mainboard/amd/olivehill/Kconfig
@@ -30,7 +30,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/olivehill
+	default "amd/olivehill"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/amd/olivehillplus/Kconfig b/src/mainboard/amd/olivehillplus/Kconfig
index 5779aaf..96d9347 100644
--- a/src/mainboard/amd/olivehillplus/Kconfig
+++ b/src/mainboard/amd/olivehillplus/Kconfig
@@ -30,7 +30,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/olivehillplus
+	default "amd/olivehillplus"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/amd/padmelon/Kconfig b/src/mainboard/amd/padmelon/Kconfig
index 3d8efb1..e4dd90c 100644
--- a/src/mainboard/amd/padmelon/Kconfig
+++ b/src/mainboard/amd/padmelon/Kconfig
@@ -35,7 +35,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/padmelon
+	default "amd/padmelon"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/amd/parmer/Kconfig b/src/mainboard/amd/parmer/Kconfig
index 506f9ac..6d989b6 100644
--- a/src/mainboard/amd/parmer/Kconfig
+++ b/src/mainboard/amd/parmer/Kconfig
@@ -30,7 +30,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/parmer
+	default "amd/parmer"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/amd/persimmon/Kconfig b/src/mainboard/amd/persimmon/Kconfig
index 4a4d274..41bf3c9 100644
--- a/src/mainboard/amd/persimmon/Kconfig
+++ b/src/mainboard/amd/persimmon/Kconfig
@@ -31,7 +31,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/persimmon
+	default "amd/persimmon"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/amd/south_station/Kconfig b/src/mainboard/amd/south_station/Kconfig
index 6f1d1b4..a059403 100644
--- a/src/mainboard/amd/south_station/Kconfig
+++ b/src/mainboard/amd/south_station/Kconfig
@@ -30,7 +30,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/south_station
+	default "amd/south_station"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/amd/thatcher/Kconfig b/src/mainboard/amd/thatcher/Kconfig
index 7791a1d..a957d4c 100644
--- a/src/mainboard/amd/thatcher/Kconfig
+++ b/src/mainboard/amd/thatcher/Kconfig
@@ -31,7 +31,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/thatcher
+	default "amd/thatcher"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/amd/union_station/Kconfig b/src/mainboard/amd/union_station/Kconfig
index 4f2cddd..72881b8 100644
--- a/src/mainboard/amd/union_station/Kconfig
+++ b/src/mainboard/amd/union_station/Kconfig
@@ -29,7 +29,7 @@
 
 config MAINBOARD_DIR
 	string
-	default amd/union_station
+	default "amd/union_station"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/aopen/dxplplusu/Kconfig b/src/mainboard/aopen/dxplplusu/Kconfig
index 738a2ea..0036915 100644
--- a/src/mainboard/aopen/dxplplusu/Kconfig
+++ b/src/mainboard/aopen/dxplplusu/Kconfig
@@ -12,7 +12,7 @@
 
 config MAINBOARD_DIR
 	string
-	default aopen/dxplplusu
+	default "aopen/dxplplusu"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/apple/macbook21/Kconfig b/src/mainboard/apple/macbook21/Kconfig
index 84c00cf..93e2d8d 100644
--- a/src/mainboard/apple/macbook21/Kconfig
+++ b/src/mainboard/apple/macbook21/Kconfig
@@ -21,7 +21,7 @@
 
 config MAINBOARD_DIR
 	string
-	default apple/macbook21
+	default "apple/macbook21"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/apple/macbookair4_2/Kconfig b/src/mainboard/apple/macbookair4_2/Kconfig
index df8ecfd..771f327 100644
--- a/src/mainboard/apple/macbookair4_2/Kconfig
+++ b/src/mainboard/apple/macbookair4_2/Kconfig
@@ -17,7 +17,7 @@
 
 config MAINBOARD_DIR
 	string
-	default apple/macbookair4_2
+	default "apple/macbookair4_2"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asrock/b75pro3-m/Kconfig b/src/mainboard/asrock/b75pro3-m/Kconfig
index 878eaad..561bea5 100644
--- a/src/mainboard/asrock/b75pro3-m/Kconfig
+++ b/src/mainboard/asrock/b75pro3-m/Kconfig
@@ -31,7 +31,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asrock/b75pro3-m
+	default "asrock/b75pro3-m"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asrock/e350m1/Kconfig b/src/mainboard/asrock/e350m1/Kconfig
index cc380e5..3bbc2a5 100644
--- a/src/mainboard/asrock/e350m1/Kconfig
+++ b/src/mainboard/asrock/e350m1/Kconfig
@@ -32,7 +32,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asrock/e350m1
+	default "asrock/e350m1"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asrock/h81m-hds/Kconfig b/src/mainboard/asrock/h81m-hds/Kconfig
index 6974cda..7088cbb 100644
--- a/src/mainboard/asrock/h81m-hds/Kconfig
+++ b/src/mainboard/asrock/h81m-hds/Kconfig
@@ -41,7 +41,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asrock/h81m-hds
+	default "asrock/h81m-hds"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asrock/imb-a180/Kconfig b/src/mainboard/asrock/imb-a180/Kconfig
index 3dae526..2391202 100644
--- a/src/mainboard/asrock/imb-a180/Kconfig
+++ b/src/mainboard/asrock/imb-a180/Kconfig
@@ -31,7 +31,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asrock/imb-a180
+	default "asrock/imb-a180"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/am1i-a/Kconfig b/src/mainboard/asus/am1i-a/Kconfig
index d50edbe..0aafd8b 100644
--- a/src/mainboard/asus/am1i-a/Kconfig
+++ b/src/mainboard/asus/am1i-a/Kconfig
@@ -20,7 +20,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/am1i-a
+	default "asus/am1i-a"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/f2a85-m/Kconfig b/src/mainboard/asus/f2a85-m/Kconfig
index 100b33c..c1dd063 100644
--- a/src/mainboard/asus/f2a85-m/Kconfig
+++ b/src/mainboard/asus/f2a85-m/Kconfig
@@ -57,7 +57,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/f2a85-m
+	default "asus/f2a85-m"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/h61m-cs/Kconfig b/src/mainboard/asus/h61m-cs/Kconfig
index 69efa9d..6040208 100644
--- a/src/mainboard/asus/h61m-cs/Kconfig
+++ b/src/mainboard/asus/h61m-cs/Kconfig
@@ -19,7 +19,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/h61m-cs
+	default "asus/h61m-cs"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/maximus_iv_gene-z/Kconfig b/src/mainboard/asus/maximus_iv_gene-z/Kconfig
index a0bc318..be832ce 100644
--- a/src/mainboard/asus/maximus_iv_gene-z/Kconfig
+++ b/src/mainboard/asus/maximus_iv_gene-z/Kconfig
@@ -36,7 +36,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/maximus_iv_gene-z
+	default "asus/maximus_iv_gene-z"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/p2b-d/Kconfig b/src/mainboard/asus/p2b-d/Kconfig
index e1fc2215..8db9b7a 100644
--- a/src/mainboard/asus/p2b-d/Kconfig
+++ b/src/mainboard/asus/p2b-d/Kconfig
@@ -29,7 +29,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/p2b-d
+	default "asus/p2b-d"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/p2b-ds/Kconfig b/src/mainboard/asus/p2b-ds/Kconfig
index b3c4b2d..8b55174 100644
--- a/src/mainboard/asus/p2b-ds/Kconfig
+++ b/src/mainboard/asus/p2b-ds/Kconfig
@@ -29,7 +29,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/p2b-ds
+	default "asus/p2b-ds"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/p2b-f/Kconfig b/src/mainboard/asus/p2b-f/Kconfig
index f0ab38d..efe625c 100644
--- a/src/mainboard/asus/p2b-f/Kconfig
+++ b/src/mainboard/asus/p2b-f/Kconfig
@@ -25,7 +25,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/p2b-f
+	default "asus/p2b-f"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/p2b-ls/Kconfig b/src/mainboard/asus/p2b-ls/Kconfig
index c39dc79..60124fe 100644
--- a/src/mainboard/asus/p2b-ls/Kconfig
+++ b/src/mainboard/asus/p2b-ls/Kconfig
@@ -27,7 +27,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/p2b-ls
+	default "asus/p2b-ls"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/p2b/Kconfig b/src/mainboard/asus/p2b/Kconfig
index f34b4dd..65e7681 100644
--- a/src/mainboard/asus/p2b/Kconfig
+++ b/src/mainboard/asus/p2b/Kconfig
@@ -26,7 +26,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/p2b
+	default "asus/p2b"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/p3b-f/Kconfig b/src/mainboard/asus/p3b-f/Kconfig
index e09adf1..179fed2 100644
--- a/src/mainboard/asus/p3b-f/Kconfig
+++ b/src/mainboard/asus/p3b-f/Kconfig
@@ -26,7 +26,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/p3b-f
+	default "asus/p3b-f"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/p5gc-mx/Kconfig b/src/mainboard/asus/p5gc-mx/Kconfig
index 193364a..a0e6014 100644
--- a/src/mainboard/asus/p5gc-mx/Kconfig
+++ b/src/mainboard/asus/p5gc-mx/Kconfig
@@ -34,7 +34,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/p5gc-mx
+	default "asus/p5gc-mx"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/p8h61-m_lx/Kconfig b/src/mainboard/asus/p8h61-m_lx/Kconfig
index 010641a..2210b1a 100644
--- a/src/mainboard/asus/p8h61-m_lx/Kconfig
+++ b/src/mainboard/asus/p8h61-m_lx/Kconfig
@@ -37,7 +37,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/p8h61-m_lx
+	default "asus/p8h61-m_lx"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/asus/p8h61-m_pro/Kconfig b/src/mainboard/asus/p8h61-m_pro/Kconfig
index e8a6f64..0c8988e0 100644
--- a/src/mainboard/asus/p8h61-m_pro/Kconfig
+++ b/src/mainboard/asus/p8h61-m_pro/Kconfig
@@ -37,7 +37,7 @@
 
 config MAINBOARD_DIR
 	string
-	default asus/p8h61-m_pro
+	default "asus/p8h61-m_pro"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/bap/ode_e20XX/Kconfig b/src/mainboard/bap/ode_e20XX/Kconfig
index 0c37d5f..1d52639 100644
--- a/src/mainboard/bap/ode_e20XX/Kconfig
+++ b/src/mainboard/bap/ode_e20XX/Kconfig
@@ -31,7 +31,7 @@
 
 config MAINBOARD_DIR
 	string
-	default bap/ode_e20XX
+	default "bap/ode_e20XX"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/bap/ode_e21XX/Kconfig b/src/mainboard/bap/ode_e21XX/Kconfig
index 3bdb573..bf812f2 100644
--- a/src/mainboard/bap/ode_e21XX/Kconfig
+++ b/src/mainboard/bap/ode_e21XX/Kconfig
@@ -31,7 +31,7 @@
 
 config MAINBOARD_DIR
 	string
-	default bap/ode_e21XX
+	default "bap/ode_e21XX"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/biostar/a68n_5200/Kconfig b/src/mainboard/biostar/a68n_5200/Kconfig
index f5f2338..e4271d3 100644
--- a/src/mainboard/biostar/a68n_5200/Kconfig
+++ b/src/mainboard/biostar/a68n_5200/Kconfig
@@ -32,7 +32,7 @@
 
 config MAINBOARD_DIR
 	string
-	default biostar/a68n_5200
+	default "biostar/a68n_5200"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/biostar/am1ml/Kconfig b/src/mainboard/biostar/am1ml/Kconfig
index a981787..31aa5f0 100644
--- a/src/mainboard/biostar/am1ml/Kconfig
+++ b/src/mainboard/biostar/am1ml/Kconfig
@@ -33,7 +33,7 @@
 
 config MAINBOARD_DIR
 	string
-	default biostar/am1ml
+	default "biostar/am1ml"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/compulab/intense_pc/Kconfig b/src/mainboard/compulab/intense_pc/Kconfig
index 3326b74..68a01f1 100644
--- a/src/mainboard/compulab/intense_pc/Kconfig
+++ b/src/mainboard/compulab/intense_pc/Kconfig
@@ -18,7 +18,7 @@
 
 config MAINBOARD_DIR
 	string
-	default compulab/intense_pc
+	default "compulab/intense_pc"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/elmex/pcm205400/Kconfig b/src/mainboard/elmex/pcm205400/Kconfig
index 850361a..7dc67d1 100644
--- a/src/mainboard/elmex/pcm205400/Kconfig
+++ b/src/mainboard/elmex/pcm205400/Kconfig
@@ -43,7 +43,7 @@
 
 config MAINBOARD_DIR
 	string
-	default elmex/pcm205400
+	default "elmex/pcm205400"
 
 config HW_MEM_HOLE_SIZEK
 	hex
diff --git a/src/mainboard/emulation/qemu-aarch64/Kconfig b/src/mainboard/emulation/qemu-aarch64/Kconfig
index ebdbf16..895446d 100644
--- a/src/mainboard/emulation/qemu-aarch64/Kconfig
+++ b/src/mainboard/emulation/qemu-aarch64/Kconfig
@@ -30,7 +30,7 @@
 
 config MAINBOARD_DIR
 	string
-	default emulation/qemu-aarch64
+	default "emulation/qemu-aarch64"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/emulation/qemu-armv7/Kconfig b/src/mainboard/emulation/qemu-armv7/Kconfig
index 73b2d5d..181f9a4 100644
--- a/src/mainboard/emulation/qemu-armv7/Kconfig
+++ b/src/mainboard/emulation/qemu-armv7/Kconfig
@@ -39,7 +39,7 @@
 
 config MAINBOARD_DIR
 	string
-	default emulation/qemu-armv7
+	default "emulation/qemu-armv7"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/emulation/qemu-i440fx/Kconfig b/src/mainboard/emulation/qemu-i440fx/Kconfig
index 8632ef6..3c27b1e 100644
--- a/src/mainboard/emulation/qemu-i440fx/Kconfig
+++ b/src/mainboard/emulation/qemu-i440fx/Kconfig
@@ -42,7 +42,7 @@
 
 config MAINBOARD_DIR
 	string
-	default emulation/qemu-i440fx
+	default "emulation/qemu-i440fx"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/emulation/qemu-q35/Kconfig b/src/mainboard/emulation/qemu-q35/Kconfig
index 8b97495..3a9bb6f 100644
--- a/src/mainboard/emulation/qemu-q35/Kconfig
+++ b/src/mainboard/emulation/qemu-q35/Kconfig
@@ -41,7 +41,7 @@
 
 config MAINBOARD_DIR
 	string
-	default emulation/qemu-q35
+	default "emulation/qemu-q35"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/emulation/qemu-riscv/Kconfig b/src/mainboard/emulation/qemu-riscv/Kconfig
index fa6dccc..4d4c900 100644
--- a/src/mainboard/emulation/qemu-riscv/Kconfig
+++ b/src/mainboard/emulation/qemu-riscv/Kconfig
@@ -44,7 +44,7 @@
 
 config MAINBOARD_DIR
 	string
-	default emulation/qemu-riscv
+	default "emulation/qemu-riscv"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/emulation/spike-riscv/Kconfig b/src/mainboard/emulation/spike-riscv/Kconfig
index 03046f72..2fe0e17 100644
--- a/src/mainboard/emulation/spike-riscv/Kconfig
+++ b/src/mainboard/emulation/spike-riscv/Kconfig
@@ -25,7 +25,7 @@
 
 config MAINBOARD_DIR
 	string
-	default emulation/spike-riscv
+	default "emulation/spike-riscv"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/emulation/spike-riscv/Kconfig.name b/src/mainboard/emulation/spike-riscv/Kconfig.name
index 17549c6..0c0205d 100644
--- a/src/mainboard/emulation/spike-riscv/Kconfig.name
+++ b/src/mainboard/emulation/spike-riscv/Kconfig.name
@@ -1,3 +1,2 @@
 config BOARD_EMULATION_SPIKE_RISCV
 	bool "SPIKE riscv"
-	help
diff --git a/src/mainboard/facebook/fbg1701/Kconfig b/src/mainboard/facebook/fbg1701/Kconfig
index c92626b..dc8dc26 100644
--- a/src/mainboard/facebook/fbg1701/Kconfig
+++ b/src/mainboard/facebook/fbg1701/Kconfig
@@ -42,7 +42,7 @@
 
 config MAINBOARD_DIR
 	string
-	default facebook/fbg1701
+	default "facebook/fbg1701"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/foxconn/d41s/Kconfig b/src/mainboard/foxconn/d41s/Kconfig
index 56ab34f..4805fe0 100644
--- a/src/mainboard/foxconn/d41s/Kconfig
+++ b/src/mainboard/foxconn/d41s/Kconfig
@@ -37,7 +37,7 @@
 
 config MAINBOARD_DIR
 	string
-	default foxconn/d41s
+	default "foxconn/d41s"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/getac/p470/Kconfig b/src/mainboard/getac/p470/Kconfig
index f1c7d45..7394ea4 100644
--- a/src/mainboard/getac/p470/Kconfig
+++ b/src/mainboard/getac/p470/Kconfig
@@ -36,7 +36,7 @@
 
 config MAINBOARD_DIR
 	string
-	default getac/p470
+	default "getac/p470"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/gigabyte/ga-945gcm-s2l/Kconfig b/src/mainboard/gigabyte/ga-945gcm-s2l/Kconfig
index e9ed54d..3c373a7 100644
--- a/src/mainboard/gigabyte/ga-945gcm-s2l/Kconfig
+++ b/src/mainboard/gigabyte/ga-945gcm-s2l/Kconfig
@@ -35,7 +35,7 @@
 
 config MAINBOARD_DIR
 	string
-	default gigabyte/ga-945gcm-s2l
+	default "gigabyte/ga-945gcm-s2l"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/gigabyte/ga-b75m-d3h/Kconfig b/src/mainboard/gigabyte/ga-b75m-d3h/Kconfig
index ceb2dbc..64d9cc5 100644
--- a/src/mainboard/gigabyte/ga-b75m-d3h/Kconfig
+++ b/src/mainboard/gigabyte/ga-b75m-d3h/Kconfig
@@ -28,7 +28,7 @@
 
 config MAINBOARD_DIR
 	string
-	default gigabyte/ga-b75m-d3h
+	default "gigabyte/ga-b75m-d3h"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/gizmosphere/gizmo/Kconfig b/src/mainboard/gizmosphere/gizmo/Kconfig
index 51f7fa0..e195e8f 100644
--- a/src/mainboard/gizmosphere/gizmo/Kconfig
+++ b/src/mainboard/gizmosphere/gizmo/Kconfig
@@ -31,7 +31,7 @@
 
 config MAINBOARD_DIR
 	string
-	default gizmosphere/gizmo
+	default "gizmosphere/gizmo"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/gizmosphere/gizmo2/Kconfig b/src/mainboard/gizmosphere/gizmo2/Kconfig
index 94158ba..034b6ee 100644
--- a/src/mainboard/gizmosphere/gizmo2/Kconfig
+++ b/src/mainboard/gizmosphere/gizmo2/Kconfig
@@ -32,7 +32,7 @@
 
 config MAINBOARD_DIR
 	string
-	default gizmosphere/gizmo2
+	default "gizmosphere/gizmo2"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/auron/Kconfig b/src/mainboard/google/auron/Kconfig
index b4ef3a83..b64b47e 100644
--- a/src/mainboard/google/auron/Kconfig
+++ b/src/mainboard/google/auron/Kconfig
@@ -27,7 +27,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/auron
+	default "google/auron"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/google/beltino/Kconfig b/src/mainboard/google/beltino/Kconfig
index 9de141f..4b18c8c 100644
--- a/src/mainboard/google/beltino/Kconfig
+++ b/src/mainboard/google/beltino/Kconfig
@@ -20,7 +20,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/beltino
+	default "google/beltino"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/google/butterfly/Kconfig b/src/mainboard/google/butterfly/Kconfig
index 76bcc3d..92fc236 100644
--- a/src/mainboard/google/butterfly/Kconfig
+++ b/src/mainboard/google/butterfly/Kconfig
@@ -26,7 +26,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/butterfly
+	default "google/butterfly"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/cheza/Kconfig b/src/mainboard/google/cheza/Kconfig
index ce69fe0..30218cc 100644
--- a/src/mainboard/google/cheza/Kconfig
+++ b/src/mainboard/google/cheza/Kconfig
@@ -25,7 +25,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/cheza
+	default "google/cheza"
 
 config MAINBOARD_VENDOR
 	string
diff --git a/src/mainboard/google/cyan/Kconfig b/src/mainboard/google/cyan/Kconfig
index 647d4e9..bb5ffb6 100644
--- a/src/mainboard/google/cyan/Kconfig
+++ b/src/mainboard/google/cyan/Kconfig
@@ -34,7 +34,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/cyan
+	default "google/cyan"
 
 config MAINBOARD_FAMILY
 	string
diff --git a/src/mainboard/google/daisy/Kconfig b/src/mainboard/google/daisy/Kconfig
index ec09d5e..f15bd9b 100644
--- a/src/mainboard/google/daisy/Kconfig
+++ b/src/mainboard/google/daisy/Kconfig
@@ -36,7 +36,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/daisy
+	default "google/daisy"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/foster/Kconfig b/src/mainboard/google/foster/Kconfig
index 6157519..eefc2c0 100644
--- a/src/mainboard/google/foster/Kconfig
+++ b/src/mainboard/google/foster/Kconfig
@@ -32,7 +32,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/foster
+	default "google/foster"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/gale/Kconfig b/src/mainboard/google/gale/Kconfig
index 5e00be0..81aaabf 100644
--- a/src/mainboard/google/gale/Kconfig
+++ b/src/mainboard/google/gale/Kconfig
@@ -41,7 +41,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/gale
+	default "google/gale"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/gru/Kconfig b/src/mainboard/google/gru/Kconfig
index e7db185..72003e0 100644
--- a/src/mainboard/google/gru/Kconfig
+++ b/src/mainboard/google/gru/Kconfig
@@ -67,7 +67,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/gru
+	default "google/gru"
 
 config MAINBOARD_VENDOR
 	string
diff --git a/src/mainboard/google/jecht/Kconfig b/src/mainboard/google/jecht/Kconfig
index 041ffce..41727c5 100644
--- a/src/mainboard/google/jecht/Kconfig
+++ b/src/mainboard/google/jecht/Kconfig
@@ -20,7 +20,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/jecht
+	default "google/jecht"
 
 
 config VARIANT_DIR
diff --git a/src/mainboard/google/kahlee/Kconfig b/src/mainboard/google/kahlee/Kconfig
index a83b07a..8632553 100644
--- a/src/mainboard/google/kahlee/Kconfig
+++ b/src/mainboard/google/kahlee/Kconfig
@@ -50,7 +50,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/kahlee
+	default "google/kahlee"
 
 config VGA_BIOS_FILE
 	string
diff --git a/src/mainboard/google/kukui/Kconfig b/src/mainboard/google/kukui/Kconfig
index c5c7a86..098ce49 100644
--- a/src/mainboard/google/kukui/Kconfig
+++ b/src/mainboard/google/kukui/Kconfig
@@ -46,7 +46,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/kukui
+	default "google/kukui"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/link/Kconfig b/src/mainboard/google/link/Kconfig
index 12c5ffe..4a32ac2 100644
--- a/src/mainboard/google/link/Kconfig
+++ b/src/mainboard/google/link/Kconfig
@@ -26,7 +26,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/link
+	default "google/link"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/mistral/Kconfig b/src/mainboard/google/mistral/Kconfig
index d6f9b16..88e6709 100644
--- a/src/mainboard/google/mistral/Kconfig
+++ b/src/mainboard/google/mistral/Kconfig
@@ -22,7 +22,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/mistral
+	default "google/mistral"
 
 config MAINBOARD_VENDOR
 	string
diff --git a/src/mainboard/google/nyan/Kconfig b/src/mainboard/google/nyan/Kconfig
index 5ad945e..c617545 100644
--- a/src/mainboard/google/nyan/Kconfig
+++ b/src/mainboard/google/nyan/Kconfig
@@ -35,7 +35,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/nyan
+	default "google/nyan"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/nyan_big/Kconfig b/src/mainboard/google/nyan_big/Kconfig
index bef2557..f02f694 100644
--- a/src/mainboard/google/nyan_big/Kconfig
+++ b/src/mainboard/google/nyan_big/Kconfig
@@ -37,7 +37,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/nyan_big
+	default "google/nyan_big"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/nyan_blaze/Kconfig b/src/mainboard/google/nyan_blaze/Kconfig
index cb00153..8de957d 100644
--- a/src/mainboard/google/nyan_blaze/Kconfig
+++ b/src/mainboard/google/nyan_blaze/Kconfig
@@ -37,7 +37,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/nyan_blaze
+	default "google/nyan_blaze"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/oak/Kconfig b/src/mainboard/google/oak/Kconfig
index f943a4f..264f371 100644
--- a/src/mainboard/google/oak/Kconfig
+++ b/src/mainboard/google/oak/Kconfig
@@ -50,7 +50,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/oak
+	default "google/oak"
 
 config MAINBOARD_VENDOR
 	string
diff --git a/src/mainboard/google/octopus/Kconfig b/src/mainboard/google/octopus/Kconfig
index d712600..1177cd5 100644
--- a/src/mainboard/google/octopus/Kconfig
+++ b/src/mainboard/google/octopus/Kconfig
@@ -48,7 +48,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/octopus
+	default "google/octopus"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/google/parrot/Kconfig b/src/mainboard/google/parrot/Kconfig
index daf605d..0169bea 100644
--- a/src/mainboard/google/parrot/Kconfig
+++ b/src/mainboard/google/parrot/Kconfig
@@ -27,7 +27,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/parrot
+	default "google/parrot"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/peach_pit/Kconfig b/src/mainboard/google/peach_pit/Kconfig
index fc2ceb8..b0b4d23 100644
--- a/src/mainboard/google/peach_pit/Kconfig
+++ b/src/mainboard/google/peach_pit/Kconfig
@@ -34,7 +34,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/peach_pit
+	default "google/peach_pit"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/rambi/Kconfig b/src/mainboard/google/rambi/Kconfig
index 83bcc1a..fc6e28e 100644
--- a/src/mainboard/google/rambi/Kconfig
+++ b/src/mainboard/google/rambi/Kconfig
@@ -23,7 +23,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/rambi
+	default "google/rambi"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/google/reef/Kconfig b/src/mainboard/google/reef/Kconfig
index 520b788..5d782b1 100644
--- a/src/mainboard/google/reef/Kconfig
+++ b/src/mainboard/google/reef/Kconfig
@@ -48,7 +48,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/reef
+	default "google/reef"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/google/slippy/Kconfig b/src/mainboard/google/slippy/Kconfig
index 13dbe19..94ade7a 100644
--- a/src/mainboard/google/slippy/Kconfig
+++ b/src/mainboard/google/slippy/Kconfig
@@ -28,7 +28,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/slippy
+	default "google/slippy"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/google/smaug/Kconfig b/src/mainboard/google/smaug/Kconfig
index 2b9be02..fa08251 100644
--- a/src/mainboard/google/smaug/Kconfig
+++ b/src/mainboard/google/smaug/Kconfig
@@ -38,7 +38,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/smaug
+	default "google/smaug"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/storm/Kconfig b/src/mainboard/google/storm/Kconfig
index 3abea56..0bd8f5a 100644
--- a/src/mainboard/google/storm/Kconfig
+++ b/src/mainboard/google/storm/Kconfig
@@ -39,7 +39,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/storm
+	default "google/storm"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/stout/Kconfig b/src/mainboard/google/stout/Kconfig
index dfe687b..a77964b 100644
--- a/src/mainboard/google/stout/Kconfig
+++ b/src/mainboard/google/stout/Kconfig
@@ -25,7 +25,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/stout
+	default "google/stout"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/trogdor/Kconfig b/src/mainboard/google/trogdor/Kconfig
index 56b3a72..fba6b17 100644
--- a/src/mainboard/google/trogdor/Kconfig
+++ b/src/mainboard/google/trogdor/Kconfig
@@ -25,7 +25,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/trogdor
+	default "google/trogdor"
 
 config MAINBOARD_VENDOR
 	string
diff --git a/src/mainboard/google/veyron/Kconfig b/src/mainboard/google/veyron/Kconfig
index 8e29661..5d1e616 100644
--- a/src/mainboard/google/veyron/Kconfig
+++ b/src/mainboard/google/veyron/Kconfig
@@ -47,7 +47,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/veyron
+	default "google/veyron"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/veyron_mickey/Kconfig b/src/mainboard/google/veyron_mickey/Kconfig
index 876d70e..5d15f0e 100644
--- a/src/mainboard/google/veyron_mickey/Kconfig
+++ b/src/mainboard/google/veyron_mickey/Kconfig
@@ -32,7 +32,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/veyron_mickey
+	default "google/veyron_mickey"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/google/veyron_rialto/Kconfig b/src/mainboard/google/veyron_rialto/Kconfig
index 4550c5b..ac6f382 100644
--- a/src/mainboard/google/veyron_rialto/Kconfig
+++ b/src/mainboard/google/veyron_rialto/Kconfig
@@ -32,7 +32,7 @@
 
 config MAINBOARD_DIR
 	string
-	default google/veyron_rialto
+	default "google/veyron_rialto"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/hp/2570p/Kconfig b/src/mainboard/hp/2570p/Kconfig
index 5e33aac2..a014b0c 100644
--- a/src/mainboard/hp/2570p/Kconfig
+++ b/src/mainboard/hp/2570p/Kconfig
@@ -35,7 +35,7 @@
 
 config MAINBOARD_DIR
 	string
-	default hp/2570p
+	default "hp/2570p"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/hp/2760p/Kconfig b/src/mainboard/hp/2760p/Kconfig
index ab29836..935064c 100644
--- a/src/mainboard/hp/2760p/Kconfig
+++ b/src/mainboard/hp/2760p/Kconfig
@@ -35,7 +35,7 @@
 
 config MAINBOARD_DIR
 	string
-	default hp/2760p
+	default "hp/2760p"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/hp/8460p/Kconfig b/src/mainboard/hp/8460p/Kconfig
index ca97cd6..08e21fd 100644
--- a/src/mainboard/hp/8460p/Kconfig
+++ b/src/mainboard/hp/8460p/Kconfig
@@ -38,7 +38,7 @@
 
 config MAINBOARD_DIR
 	string
-	default hp/8460p
+	default "hp/8460p"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/hp/8470p/Kconfig b/src/mainboard/hp/8470p/Kconfig
index 5b30208..e084d00 100644
--- a/src/mainboard/hp/8470p/Kconfig
+++ b/src/mainboard/hp/8470p/Kconfig
@@ -36,7 +36,7 @@
 
 config MAINBOARD_DIR
 	string
-	default hp/8470p
+	default "hp/8470p"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/hp/8770w/Kconfig b/src/mainboard/hp/8770w/Kconfig
index 41e2ed3..80f9199 100644
--- a/src/mainboard/hp/8770w/Kconfig
+++ b/src/mainboard/hp/8770w/Kconfig
@@ -35,7 +35,7 @@
 
 config MAINBOARD_DIR
 	string
-	default hp/8770w
+	default "hp/8770w"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/hp/abm/Kconfig b/src/mainboard/hp/abm/Kconfig
index 43cf67f..5ba1b5b 100644
--- a/src/mainboard/hp/abm/Kconfig
+++ b/src/mainboard/hp/abm/Kconfig
@@ -30,7 +30,7 @@
 
 config MAINBOARD_DIR
 	string
-	default hp/abm
+	default "hp/abm"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/hp/compaq_8200_elite_sff/Kconfig b/src/mainboard/hp/compaq_8200_elite_sff/Kconfig
index cbfb0ed..42efd4a 100644
--- a/src/mainboard/hp/compaq_8200_elite_sff/Kconfig
+++ b/src/mainboard/hp/compaq_8200_elite_sff/Kconfig
@@ -21,7 +21,7 @@
 
 config MAINBOARD_DIR
 	string
-	default hp/compaq_8200_elite_sff
+	default "hp/compaq_8200_elite_sff"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/hp/folio_9470m/Kconfig b/src/mainboard/hp/folio_9470m/Kconfig
index d9bb68e..8759192 100644
--- a/src/mainboard/hp/folio_9470m/Kconfig
+++ b/src/mainboard/hp/folio_9470m/Kconfig
@@ -21,7 +21,7 @@
 
 config MAINBOARD_DIR
 	string
-	default hp/folio_9470m
+	default "hp/folio_9470m"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/hp/pavilion_m6_1035dx/Kconfig b/src/mainboard/hp/pavilion_m6_1035dx/Kconfig
index 7fa04ee..3c67e2a 100644
--- a/src/mainboard/hp/pavilion_m6_1035dx/Kconfig
+++ b/src/mainboard/hp/pavilion_m6_1035dx/Kconfig
@@ -35,7 +35,7 @@
 
 config MAINBOARD_DIR
 	string
-	default hp/pavilion_m6_1035dx
+	default "hp/pavilion_m6_1035dx"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/hp/revolve_810_g1/Kconfig b/src/mainboard/hp/revolve_810_g1/Kconfig
index ce7364c..26e645f 100644
--- a/src/mainboard/hp/revolve_810_g1/Kconfig
+++ b/src/mainboard/hp/revolve_810_g1/Kconfig
@@ -23,7 +23,7 @@
 
 config MAINBOARD_DIR
 	string
-	default hp/revolve_810_g1
+	default "hp/revolve_810_g1"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/hp/z220_sff_workstation/Kconfig b/src/mainboard/hp/z220_sff_workstation/Kconfig
index 4598de2..649cbb1 100644
--- a/src/mainboard/hp/z220_sff_workstation/Kconfig
+++ b/src/mainboard/hp/z220_sff_workstation/Kconfig
@@ -32,7 +32,7 @@
 
 config MAINBOARD_DIR
 	string
-	default hp/z220_sff_workstation
+	default "hp/z220_sff_workstation"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/ibase/mb899/Kconfig b/src/mainboard/ibase/mb899/Kconfig
index fcc2e38..d93121d 100644
--- a/src/mainboard/ibase/mb899/Kconfig
+++ b/src/mainboard/ibase/mb899/Kconfig
@@ -18,7 +18,7 @@
 
 config MAINBOARD_DIR
 	string
-	default ibase/mb899
+	default "ibase/mb899"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/intel/apollolake_rvp/Kconfig b/src/mainboard/intel/apollolake_rvp/Kconfig
index ed7d77f..391ce1f 100644
--- a/src/mainboard/intel/apollolake_rvp/Kconfig
+++ b/src/mainboard/intel/apollolake_rvp/Kconfig
@@ -9,7 +9,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/apollolake_rvp
+	default "intel/apollolake_rvp"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/intel/baskingridge/Kconfig b/src/mainboard/intel/baskingridge/Kconfig
index d5dafa0..8268891 100644
--- a/src/mainboard/intel/baskingridge/Kconfig
+++ b/src/mainboard/intel/baskingridge/Kconfig
@@ -18,7 +18,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/baskingridge
+	default "intel/baskingridge"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/intel/d510mo/Kconfig b/src/mainboard/intel/d510mo/Kconfig
index 153c113..003e009 100644
--- a/src/mainboard/intel/d510mo/Kconfig
+++ b/src/mainboard/intel/d510mo/Kconfig
@@ -36,7 +36,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/d510mo
+	default "intel/d510mo"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/intel/d945gclf/Kconfig b/src/mainboard/intel/d945gclf/Kconfig
index 46d82ec..683ea2d 100644
--- a/src/mainboard/intel/d945gclf/Kconfig
+++ b/src/mainboard/intel/d945gclf/Kconfig
@@ -33,7 +33,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/d945gclf
+	default "intel/d945gclf"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/intel/dcp847ske/Kconfig b/src/mainboard/intel/dcp847ske/Kconfig
index b1c7bab..9bf9e52 100644
--- a/src/mainboard/intel/dcp847ske/Kconfig
+++ b/src/mainboard/intel/dcp847ske/Kconfig
@@ -27,7 +27,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/dcp847ske
+	default "intel/dcp847ske"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/intel/emeraldlake2/Kconfig b/src/mainboard/intel/emeraldlake2/Kconfig
index 61dd1b0..c37da03 100644
--- a/src/mainboard/intel/emeraldlake2/Kconfig
+++ b/src/mainboard/intel/emeraldlake2/Kconfig
@@ -19,7 +19,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/emeraldlake2
+	default "intel/emeraldlake2"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/intel/galileo/Kconfig b/src/mainboard/intel/galileo/Kconfig
index 84f09c4..2e855da 100644
--- a/src/mainboard/intel/galileo/Kconfig
+++ b/src/mainboard/intel/galileo/Kconfig
@@ -28,7 +28,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/galileo
+	default "intel/galileo"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/intel/glkrvp/Kconfig b/src/mainboard/intel/glkrvp/Kconfig
index ebb5a3a..8ed2aff 100644
--- a/src/mainboard/intel/glkrvp/Kconfig
+++ b/src/mainboard/intel/glkrvp/Kconfig
@@ -50,7 +50,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/glkrvp
+	default "intel/glkrvp"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/intel/harcuvar/Kconfig b/src/mainboard/intel/harcuvar/Kconfig
index 9d43b11..e3cd86e8 100644
--- a/src/mainboard/intel/harcuvar/Kconfig
+++ b/src/mainboard/intel/harcuvar/Kconfig
@@ -23,7 +23,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/harcuvar
+	default "intel/harcuvar"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/intel/leafhill/Kconfig b/src/mainboard/intel/leafhill/Kconfig
index e89d892..5832570 100644
--- a/src/mainboard/intel/leafhill/Kconfig
+++ b/src/mainboard/intel/leafhill/Kconfig
@@ -9,7 +9,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/leafhill
+	default "intel/leafhill"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/intel/minnow3/Kconfig b/src/mainboard/intel/minnow3/Kconfig
index 2dea6b4..8d95a35 100644
--- a/src/mainboard/intel/minnow3/Kconfig
+++ b/src/mainboard/intel/minnow3/Kconfig
@@ -9,7 +9,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/minnow3
+	default "intel/minnow3"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/intel/strago/Kconfig b/src/mainboard/intel/strago/Kconfig
index 5a49e8c..246add1 100644
--- a/src/mainboard/intel/strago/Kconfig
+++ b/src/mainboard/intel/strago/Kconfig
@@ -24,7 +24,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/strago
+	default "intel/strago"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/intel/wtm2/Kconfig b/src/mainboard/intel/wtm2/Kconfig
index 27545fe..2f6b21e 100644
--- a/src/mainboard/intel/wtm2/Kconfig
+++ b/src/mainboard/intel/wtm2/Kconfig
@@ -19,7 +19,7 @@
 
 config MAINBOARD_DIR
 	string
-	default intel/wtm2
+	default "intel/wtm2"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/jetway/nf81-t56n-lf/Kconfig b/src/mainboard/jetway/nf81-t56n-lf/Kconfig
index 6cc06c2..d2dda67 100644
--- a/src/mainboard/jetway/nf81-t56n-lf/Kconfig
+++ b/src/mainboard/jetway/nf81-t56n-lf/Kconfig
@@ -32,7 +32,7 @@
 
 config MAINBOARD_DIR
 	string
-	default jetway/nf81-t56n-lf
+	default "jetway/nf81-t56n-lf"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/kontron/986lcd-m/Kconfig b/src/mainboard/kontron/986lcd-m/Kconfig
index 5584eb3..1ccdf1a 100644
--- a/src/mainboard/kontron/986lcd-m/Kconfig
+++ b/src/mainboard/kontron/986lcd-m/Kconfig
@@ -20,7 +20,7 @@
 
 config MAINBOARD_DIR
 	string
-	default kontron/986lcd-m
+	default "kontron/986lcd-m"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/kontron/ktqm77/Kconfig b/src/mainboard/kontron/ktqm77/Kconfig
index c215bdf..1cefa59 100644
--- a/src/mainboard/kontron/ktqm77/Kconfig
+++ b/src/mainboard/kontron/ktqm77/Kconfig
@@ -17,7 +17,7 @@
 
 config MAINBOARD_DIR
 	string
-	default kontron/ktqm77
+	default "kontron/ktqm77"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/g505s/Kconfig b/src/mainboard/lenovo/g505s/Kconfig
index b80019e..a277145 100644
--- a/src/mainboard/lenovo/g505s/Kconfig
+++ b/src/mainboard/lenovo/g505s/Kconfig
@@ -33,7 +33,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/g505s
+	default "lenovo/g505s"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/l520/Kconfig b/src/mainboard/lenovo/l520/Kconfig
index 4495d79..a300d16 100644
--- a/src/mainboard/lenovo/l520/Kconfig
+++ b/src/mainboard/lenovo/l520/Kconfig
@@ -20,7 +20,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/l520
+	default "lenovo/l520"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/s230u/Kconfig b/src/mainboard/lenovo/s230u/Kconfig
index c7faebb..662c9a5 100644
--- a/src/mainboard/lenovo/s230u/Kconfig
+++ b/src/mainboard/lenovo/s230u/Kconfig
@@ -22,7 +22,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/s230u
+	default "lenovo/s230u"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/t400/Kconfig b/src/mainboard/lenovo/t400/Kconfig
index a68d1fa..9355540 100644
--- a/src/mainboard/lenovo/t400/Kconfig
+++ b/src/mainboard/lenovo/t400/Kconfig
@@ -47,7 +47,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/t400
+	default "lenovo/t400"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/lenovo/t410/Kconfig b/src/mainboard/lenovo/t410/Kconfig
index 329d08d..943bf43 100644
--- a/src/mainboard/lenovo/t410/Kconfig
+++ b/src/mainboard/lenovo/t410/Kconfig
@@ -44,7 +44,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/t410
+	default "lenovo/t410"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/t420/Kconfig b/src/mainboard/lenovo/t420/Kconfig
index 5148604..d26ad17 100644
--- a/src/mainboard/lenovo/t420/Kconfig
+++ b/src/mainboard/lenovo/t420/Kconfig
@@ -49,7 +49,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/t420
+	default "lenovo/t420"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/t420s/Kconfig b/src/mainboard/lenovo/t420s/Kconfig
index 190f35e..89f84fc 100644
--- a/src/mainboard/lenovo/t420s/Kconfig
+++ b/src/mainboard/lenovo/t420s/Kconfig
@@ -48,7 +48,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/t420s
+	default "lenovo/t420s"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/t430/Kconfig b/src/mainboard/lenovo/t430/Kconfig
index 7137b5e..78da385 100644
--- a/src/mainboard/lenovo/t430/Kconfig
+++ b/src/mainboard/lenovo/t430/Kconfig
@@ -28,7 +28,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/t430
+	default "lenovo/t430"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/t430s/Kconfig b/src/mainboard/lenovo/t430s/Kconfig
index 0c7d075..36f03ae 100644
--- a/src/mainboard/lenovo/t430s/Kconfig
+++ b/src/mainboard/lenovo/t430s/Kconfig
@@ -29,7 +29,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/t430s
+	default "lenovo/t430s"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/lenovo/t440p/Kconfig b/src/mainboard/lenovo/t440p/Kconfig
index bf821f3..faaa73a 100644
--- a/src/mainboard/lenovo/t440p/Kconfig
+++ b/src/mainboard/lenovo/t440p/Kconfig
@@ -25,7 +25,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/t440p
+	default "lenovo/t440p"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/t520/Kconfig b/src/mainboard/lenovo/t520/Kconfig
index d4934d6..a6183d9 100644
--- a/src/mainboard/lenovo/t520/Kconfig
+++ b/src/mainboard/lenovo/t520/Kconfig
@@ -49,7 +49,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/t520
+	default "lenovo/t520"
 
 config DEVICETREE
 	string
diff --git a/src/mainboard/lenovo/t530/Kconfig b/src/mainboard/lenovo/t530/Kconfig
index f63a120..d1ba6a8 100644
--- a/src/mainboard/lenovo/t530/Kconfig
+++ b/src/mainboard/lenovo/t530/Kconfig
@@ -35,7 +35,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/t530
+	default "lenovo/t530"
 
 config DEVICETREE
 	string
diff --git a/src/mainboard/lenovo/t60/Kconfig b/src/mainboard/lenovo/t60/Kconfig
index 436b035..58d41a6 100644
--- a/src/mainboard/lenovo/t60/Kconfig
+++ b/src/mainboard/lenovo/t60/Kconfig
@@ -25,7 +25,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/t60
+	default "lenovo/t60"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/lenovo/x131e/Kconfig b/src/mainboard/lenovo/x131e/Kconfig
index e7da8d0..2cf3a8f 100644
--- a/src/mainboard/lenovo/x131e/Kconfig
+++ b/src/mainboard/lenovo/x131e/Kconfig
@@ -23,7 +23,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/x131e
+	default "lenovo/x131e"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/x1_carbon_gen1/Kconfig b/src/mainboard/lenovo/x1_carbon_gen1/Kconfig
index a15cadf..91ba208 100644
--- a/src/mainboard/lenovo/x1_carbon_gen1/Kconfig
+++ b/src/mainboard/lenovo/x1_carbon_gen1/Kconfig
@@ -28,7 +28,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/x1_carbon_gen1
+	default "lenovo/x1_carbon_gen1"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/x200/Kconfig b/src/mainboard/lenovo/x200/Kconfig
index 5e88c21..432c805 100644
--- a/src/mainboard/lenovo/x200/Kconfig
+++ b/src/mainboard/lenovo/x200/Kconfig
@@ -44,7 +44,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/x200
+	default "lenovo/x200"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/lenovo/x201/Kconfig b/src/mainboard/lenovo/x201/Kconfig
index e40c0d3..a94d24e 100644
--- a/src/mainboard/lenovo/x201/Kconfig
+++ b/src/mainboard/lenovo/x201/Kconfig
@@ -44,7 +44,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/x201
+	default "lenovo/x201"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/x220/Kconfig b/src/mainboard/lenovo/x220/Kconfig
index c80c2520..b20255e 100644
--- a/src/mainboard/lenovo/x220/Kconfig
+++ b/src/mainboard/lenovo/x220/Kconfig
@@ -43,7 +43,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/x220
+	default "lenovo/x220"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/lenovo/x230/Kconfig b/src/mainboard/lenovo/x230/Kconfig
index a043efc..e7edf6b 100644
--- a/src/mainboard/lenovo/x230/Kconfig
+++ b/src/mainboard/lenovo/x230/Kconfig
@@ -29,7 +29,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/x230
+	default "lenovo/x230"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lenovo/x60/Kconfig b/src/mainboard/lenovo/x60/Kconfig
index a1a5fec..1815892 100644
--- a/src/mainboard/lenovo/x60/Kconfig
+++ b/src/mainboard/lenovo/x60/Kconfig
@@ -28,7 +28,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lenovo/x60
+	default "lenovo/x60"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lippert/frontrunner-af/Kconfig b/src/mainboard/lippert/frontrunner-af/Kconfig
index f8a3f3a..92d7743 100644
--- a/src/mainboard/lippert/frontrunner-af/Kconfig
+++ b/src/mainboard/lippert/frontrunner-af/Kconfig
@@ -33,7 +33,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lippert/frontrunner-af
+	default "lippert/frontrunner-af"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/lippert/toucan-af/Kconfig b/src/mainboard/lippert/toucan-af/Kconfig
index 67efdfe..74b335a 100644
--- a/src/mainboard/lippert/toucan-af/Kconfig
+++ b/src/mainboard/lippert/toucan-af/Kconfig
@@ -35,7 +35,7 @@
 
 config MAINBOARD_DIR
 	string
-	default lippert/toucan-af
+	default "lippert/toucan-af"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/msi/ms7707/Kconfig b/src/mainboard/msi/ms7707/Kconfig
index 4923bbf..c1a1b4c 100644
--- a/src/mainboard/msi/ms7707/Kconfig
+++ b/src/mainboard/msi/ms7707/Kconfig
@@ -16,7 +16,7 @@
 
 config MAINBOARD_DIR
 	string
-	default msi/ms7707
+	default "msi/ms7707"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/msi/ms7721/Kconfig b/src/mainboard/msi/ms7721/Kconfig
index 5fa4768..1fee747 100644
--- a/src/mainboard/msi/ms7721/Kconfig
+++ b/src/mainboard/msi/ms7721/Kconfig
@@ -33,7 +33,7 @@
 
 config MAINBOARD_DIR
 	string
-	default msi/ms7721
+	default "msi/ms7721"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/packardbell/ms2290/Kconfig b/src/mainboard/packardbell/ms2290/Kconfig
index a104fec..6a61384 100644
--- a/src/mainboard/packardbell/ms2290/Kconfig
+++ b/src/mainboard/packardbell/ms2290/Kconfig
@@ -16,7 +16,7 @@
 
 config MAINBOARD_DIR
 	string
-	default packardbell/ms2290
+	default "packardbell/ms2290"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/pcengines/apu1/Kconfig b/src/mainboard/pcengines/apu1/Kconfig
index 07aaa8c..3396845 100644
--- a/src/mainboard/pcengines/apu1/Kconfig
+++ b/src/mainboard/pcengines/apu1/Kconfig
@@ -35,7 +35,7 @@
 
 config MAINBOARD_DIR
 	string
-	default pcengines/apu1
+	default "pcengines/apu1"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/pcengines/apu2/Kconfig b/src/mainboard/pcengines/apu2/Kconfig
index 6c3958b..0437c84 100644
--- a/src/mainboard/pcengines/apu2/Kconfig
+++ b/src/mainboard/pcengines/apu2/Kconfig
@@ -36,7 +36,7 @@
 
 config MAINBOARD_DIR
 	string
-	default pcengines/apu2
+	default "pcengines/apu2"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/portwell/m107/Kconfig b/src/mainboard/portwell/m107/Kconfig
index e5e3ff5..a89daa1 100644
--- a/src/mainboard/portwell/m107/Kconfig
+++ b/src/mainboard/portwell/m107/Kconfig
@@ -51,7 +51,7 @@
 
 config MAINBOARD_DIR
 	string
-	default portwell/m107
+	default "portwell/m107"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/purism/librem_bdw/Kconfig b/src/mainboard/purism/librem_bdw/Kconfig
index 224bde0..466e03e 100644
--- a/src/mainboard/purism/librem_bdw/Kconfig
+++ b/src/mainboard/purism/librem_bdw/Kconfig
@@ -40,7 +40,7 @@
 
 config MAINBOARD_DIR
 	string
-	default purism/librem_bdw
+	default "purism/librem_bdw"
 
 config MAINBOARD_VENDOR
 	string
diff --git a/src/mainboard/roda/rk886ex/Kconfig b/src/mainboard/roda/rk886ex/Kconfig
index 563b7739..9d08c96 100644
--- a/src/mainboard/roda/rk886ex/Kconfig
+++ b/src/mainboard/roda/rk886ex/Kconfig
@@ -22,7 +22,7 @@
 
 config MAINBOARD_DIR
 	string
-	default roda/rk886ex
+	default "roda/rk886ex"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/roda/rk9/Kconfig b/src/mainboard/roda/rk9/Kconfig
index fd29739..7516255 100644
--- a/src/mainboard/roda/rk9/Kconfig
+++ b/src/mainboard/roda/rk9/Kconfig
@@ -19,7 +19,7 @@
 
 config MAINBOARD_DIR
 	string
-	default roda/rk9
+	default "roda/rk9"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/samsung/lumpy/Kconfig b/src/mainboard/samsung/lumpy/Kconfig
index 2d1544b..f87ba8f 100644
--- a/src/mainboard/samsung/lumpy/Kconfig
+++ b/src/mainboard/samsung/lumpy/Kconfig
@@ -29,7 +29,7 @@
 
 config MAINBOARD_DIR
 	string
-	default samsung/lumpy
+	default "samsung/lumpy"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/samsung/stumpy/Kconfig b/src/mainboard/samsung/stumpy/Kconfig
index a2919f9..5deb0f0 100644
--- a/src/mainboard/samsung/stumpy/Kconfig
+++ b/src/mainboard/samsung/stumpy/Kconfig
@@ -25,7 +25,7 @@
 
 config MAINBOARD_DIR
 	string
-	default samsung/stumpy
+	default "samsung/stumpy"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/sapphire/pureplatinumh61/Kconfig b/src/mainboard/sapphire/pureplatinumh61/Kconfig
index 6d27b3f..0e289c1 100644
--- a/src/mainboard/sapphire/pureplatinumh61/Kconfig
+++ b/src/mainboard/sapphire/pureplatinumh61/Kconfig
@@ -18,7 +18,7 @@
 
 config MAINBOARD_DIR
 	string
-	default sapphire/pureplatinumh61
+	default "sapphire/pureplatinumh61"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/scaleway/tagada/Kconfig b/src/mainboard/scaleway/tagada/Kconfig
index 9530505..25cb7e1 100644
--- a/src/mainboard/scaleway/tagada/Kconfig
+++ b/src/mainboard/scaleway/tagada/Kconfig
@@ -26,7 +26,7 @@
 
 config MAINBOARD_DIR
 	string
-	default scaleway/tagada
+	default "scaleway/tagada"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/siemens/mc_apl1/Kconfig b/src/mainboard/siemens/mc_apl1/Kconfig
index 0b8cff3..52883b8 100644
--- a/src/mainboard/siemens/mc_apl1/Kconfig
+++ b/src/mainboard/siemens/mc_apl1/Kconfig
@@ -13,7 +13,7 @@
 
 config MAINBOARD_DIR
 	string
-	default siemens/mc_apl1
+	default "siemens/mc_apl1"
 
 config VARIANT_DIR
 	string
diff --git a/src/mainboard/sifive/hifive-unleashed/Kconfig b/src/mainboard/sifive/hifive-unleashed/Kconfig
index fc9bc1e..460fdfb 100644
--- a/src/mainboard/sifive/hifive-unleashed/Kconfig
+++ b/src/mainboard/sifive/hifive-unleashed/Kconfig
@@ -26,7 +26,7 @@
 
 config MAINBOARD_DIR
 	string
-	default sifive/hifive-unleashed
+	default "sifive/hifive-unleashed"
 
 config MAINBOARD_PART_NUMBER
 	string
diff --git a/src/mainboard/ti/beaglebone/Kconfig b/src/mainboard/ti/beaglebone/Kconfig
index 322ac0c..7009622 100644
--- a/src/mainboard/ti/beaglebone/Kconfig
+++ b/src/mainboard/ti/beaglebone/Kconfig
@@ -23,7 +23,7 @@
 
 config MAINBOARD_DIR
 	string
-	default ti/beaglebone
+	default "ti/beaglebone"
 
 config MAINBOARD_PART_NUMBER
 	string