diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index c044ad4..85fddd2 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -132,6 +132,7 @@ config ARC_CACHE_LINE_SHIFT
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_DUMMY
 	bool "Dummy target"
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index cee3126..1c7cf7f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -64,6 +64,7 @@ config SEMIHOSTING
 
 choice
 	prompt "Target select"
+	optional
 
 config ARCH_AT91
 	bool "Atmel AT91"
diff --git a/arch/arm/cpu/armv7/exynos/Kconfig b/arch/arm/cpu/armv7/exynos/Kconfig
index f6084ac..c614425 100644
--- a/arch/arm/cpu/armv7/exynos/Kconfig
+++ b/arch/arm/cpu/armv7/exynos/Kconfig
@@ -2,6 +2,7 @@ if ARCH_EXYNOS
 
 choice
 	prompt "EXYNOS board select"
+	optional
 
 config TARGET_SMDKV310
 	select SUPPORT_SPL
diff --git a/arch/arm/cpu/armv7/mx5/Kconfig b/arch/arm/cpu/armv7/mx5/Kconfig
index 2d6c0ce..9f250c6 100644
--- a/arch/arm/cpu/armv7/mx5/Kconfig
+++ b/arch/arm/cpu/armv7/mx5/Kconfig
@@ -12,6 +12,7 @@ config MX53
 
 choice
 	prompt "MX5 board select"
+	optional
 
 config TARGET_USBARMORY
 	bool "Support USB armory"
diff --git a/arch/arm/cpu/armv7/mx6/Kconfig b/arch/arm/cpu/armv7/mx6/Kconfig
index 076ba52..1282be3 100644
--- a/arch/arm/cpu/armv7/mx6/Kconfig
+++ b/arch/arm/cpu/armv7/mx6/Kconfig
@@ -27,6 +27,7 @@ config MX6SX
 
 choice
 	prompt "MX6 board select"
+	optional
 
 config TARGET_SECOMX6
 	bool "Support secomx6 boards"
diff --git a/arch/arm/cpu/armv7/omap3/Kconfig b/arch/arm/cpu/armv7/omap3/Kconfig
index cc82c50..b32a6b0 100644
--- a/arch/arm/cpu/armv7/omap3/Kconfig
+++ b/arch/arm/cpu/armv7/omap3/Kconfig
@@ -2,6 +2,7 @@ if OMAP34XX
 
 choice
 	prompt "OMAP3 board select"
+	optional
 
 config TARGET_AM3517_EVM
 	bool "AM3517 EVM"
diff --git a/arch/arm/cpu/armv7/omap4/Kconfig b/arch/arm/cpu/armv7/omap4/Kconfig
index eccf897..df27ea1 100644
--- a/arch/arm/cpu/armv7/omap4/Kconfig
+++ b/arch/arm/cpu/armv7/omap4/Kconfig
@@ -2,6 +2,7 @@ if OMAP44XX
 
 choice
 	prompt "OMAP4 board select"
+	optional
 
 config TARGET_DUOVERO
 	bool "OMAP4430 Gumstix Duovero"
diff --git a/arch/arm/cpu/armv7/omap5/Kconfig b/arch/arm/cpu/armv7/omap5/Kconfig
index aca862d..20c3bd9 100644
--- a/arch/arm/cpu/armv7/omap5/Kconfig
+++ b/arch/arm/cpu/armv7/omap5/Kconfig
@@ -2,6 +2,7 @@ if OMAP54XX
 
 choice
 	prompt "OMAP5 board select"
+	optional
 
 config TARGET_CM_T54
 	bool "CompuLab CM-T54"
diff --git a/arch/arm/cpu/armv7/rmobile/Kconfig b/arch/arm/cpu/armv7/rmobile/Kconfig
index 57dccec..ae23078 100644
--- a/arch/arm/cpu/armv7/rmobile/Kconfig
+++ b/arch/arm/cpu/armv7/rmobile/Kconfig
@@ -2,6 +2,7 @@ if RMOBILE
 
 choice
 	prompt "Renesus ARM SoCs board select"
+	optional
 
 config TARGET_ARMADILLO_800EVA
 	bool "armadillo 800 eva board"
diff --git a/arch/arm/cpu/armv7/s5pc1xx/Kconfig b/arch/arm/cpu/armv7/s5pc1xx/Kconfig
index bc73813..04acdaa 100644
--- a/arch/arm/cpu/armv7/s5pc1xx/Kconfig
+++ b/arch/arm/cpu/armv7/s5pc1xx/Kconfig
@@ -2,6 +2,7 @@ if ARCH_S5PC1XX
 
 choice
 	prompt "S5PC1XX board select"
+	optional
 
 config TARGET_S5P_GONI
 	bool "S5P Goni board"
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index b660a5b..7dfa520 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -2,6 +2,7 @@ if ARCH_AT91
 
 choice
 	prompt "Atmel AT91 board select"
+	optional
 
 config TARGET_AT91RM9200EK
 	bool "Atmel AT91RM9200 evaluation kit"
diff --git a/arch/arm/mach-bcm283x/Kconfig b/arch/arm/mach-bcm283x/Kconfig
index c740180..99779df 100644
--- a/arch/arm/mach-bcm283x/Kconfig
+++ b/arch/arm/mach-bcm283x/Kconfig
@@ -3,6 +3,7 @@ menu "Broadcom BCM283X family"
 
 choice
 	prompt "Broadcom BCM283X board select"
+	optional
 
 config TARGET_RPI
 	bool "Raspberry Pi"
diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig
index 3ef55d3..e6cb390 100644
--- a/arch/arm/mach-davinci/Kconfig
+++ b/arch/arm/mach-davinci/Kconfig
@@ -2,6 +2,7 @@ if ARCH_DAVINCI
 
 choice
 	prompt "DaVinci board select"
+	optional
 
 config TARGET_ENBW_CMC
 	bool "EnBW CMC board"
diff --git a/arch/arm/mach-integrator/Kconfig b/arch/arm/mach-integrator/Kconfig
index 8ffc544..c54d69d 100644
--- a/arch/arm/mach-integrator/Kconfig
+++ b/arch/arm/mach-integrator/Kconfig
@@ -3,6 +3,7 @@ menu "Integrator Options"
 
 choice
 	prompt "Integrator platform select"
+	optional
 
 config ARCH_INTEGRATOR_AP
 	bool "Support Integrator/AP platform"
@@ -18,6 +19,7 @@ config ARCH_CINTEGRATOR
 
 choice
 	prompt "Integrator core module select"
+	optional
 
 config CM720T
 	bool "Core Module for ARM720T"
diff --git a/arch/arm/mach-keystone/Kconfig b/arch/arm/mach-keystone/Kconfig
index 134ae87..67f1a33 100644
--- a/arch/arm/mach-keystone/Kconfig
+++ b/arch/arm/mach-keystone/Kconfig
@@ -2,6 +2,7 @@ if ARCH_KEYSTONE
 
 choice
 	prompt "TI Keystone board select"
+	optional
 
 config TARGET_K2HK_EVM
 	bool "TI Keystone 2 Kepler/Hawking EVM"
diff --git a/arch/arm/mach-kirkwood/Kconfig b/arch/arm/mach-kirkwood/Kconfig
index 45c6687..1261885 100644
--- a/arch/arm/mach-kirkwood/Kconfig
+++ b/arch/arm/mach-kirkwood/Kconfig
@@ -2,6 +2,7 @@ if KIRKWOOD
 
 choice
 	prompt "Marvell Kirkwood board select"
+	optional
 
 config TARGET_OPENRD
 	bool "Marvell OpenRD Board"
diff --git a/arch/arm/mach-nomadik/Kconfig b/arch/arm/mach-nomadik/Kconfig
index 265f336..ba72a41 100644
--- a/arch/arm/mach-nomadik/Kconfig
+++ b/arch/arm/mach-nomadik/Kconfig
@@ -2,6 +2,7 @@ if ARCH_NOMADIK
 
 choice
 	prompt "Nomadik board select"
+	optional
 
 config NOMADIK_NHK8815
 	bool "ST 8815 Nomadik Hardware Kit"
diff --git a/arch/arm/mach-orion5x/Kconfig b/arch/arm/mach-orion5x/Kconfig
index 291c511..7644b8d 100644
--- a/arch/arm/mach-orion5x/Kconfig
+++ b/arch/arm/mach-orion5x/Kconfig
@@ -2,6 +2,7 @@ if ORION5X
 
 choice
 	prompt "Marvell Orion board select"
+	optional
 
 config TARGET_EDMINIV2
 	bool "LaCie Ethernet Disk mini V2"
diff --git a/arch/arm/mach-socfpga/Kconfig b/arch/arm/mach-socfpga/Kconfig
index 204efca..e46c348 100644
--- a/arch/arm/mach-socfpga/Kconfig
+++ b/arch/arm/mach-socfpga/Kconfig
@@ -2,6 +2,7 @@ if ARCH_SOCFPGA
 
 choice
 	prompt "Altera SOCFPGA board select"
+	optional
 
 config TARGET_SOCFPGA_ARRIA5
 	bool "Altera SOCFPGA Arria V"
diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index 8bab594..9b42871 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -2,6 +2,7 @@ if TEGRA
 
 choice
 	prompt "Tegra SoC select"
+	optional
 
 config TEGRA20
 	bool "Tegra20 family"
diff --git a/arch/arm/mach-tegra/tegra114/Kconfig b/arch/arm/mach-tegra/tegra114/Kconfig
index 31012bc..1047b92 100644
--- a/arch/arm/mach-tegra/tegra114/Kconfig
+++ b/arch/arm/mach-tegra/tegra114/Kconfig
@@ -2,6 +2,7 @@ if TEGRA114
 
 choice
 	prompt "Tegra114 board select"
+	optional
 
 config TARGET_DALMORE
 	bool "NVIDIA Tegra114 Dalmore evaluation board"
diff --git a/arch/arm/mach-tegra/tegra124/Kconfig b/arch/arm/mach-tegra/tegra124/Kconfig
index 88f627c..36bb636 100644
--- a/arch/arm/mach-tegra/tegra124/Kconfig
+++ b/arch/arm/mach-tegra/tegra124/Kconfig
@@ -2,6 +2,7 @@ if TEGRA124
 
 choice
 	prompt "Tegra124 board select"
+	optional
 
 config TARGET_JETSON_TK1
 	bool "NVIDIA Tegra124 Jetson TK1 board"
diff --git a/arch/arm/mach-tegra/tegra20/Kconfig b/arch/arm/mach-tegra/tegra20/Kconfig
index 7f09f81..1bb8dff 100644
--- a/arch/arm/mach-tegra/tegra20/Kconfig
+++ b/arch/arm/mach-tegra/tegra20/Kconfig
@@ -2,6 +2,7 @@ if TEGRA20
 
 choice
 	prompt "Tegra20 board select"
+	optional
 
 config TARGET_HARMONY
 	bool "NVIDIA Tegra20 Harmony evaluation board"
diff --git a/arch/arm/mach-tegra/tegra30/Kconfig b/arch/arm/mach-tegra/tegra30/Kconfig
index 3abdc7b..e78331e 100644
--- a/arch/arm/mach-tegra/tegra30/Kconfig
+++ b/arch/arm/mach-tegra/tegra30/Kconfig
@@ -2,6 +2,7 @@ if TEGRA30
 
 choice
 	prompt "Tegra30 board select"
+	optional
 
 config TARGET_APALIS_T30
 	bool "Toradex Apalis T30 board"
diff --git a/arch/arm/mach-uniphier/Kconfig b/arch/arm/mach-uniphier/Kconfig
index 288e6ab..2d27c49 100644
--- a/arch/arm/mach-uniphier/Kconfig
+++ b/arch/arm/mach-uniphier/Kconfig
@@ -9,6 +9,7 @@ config UNIPHIER_SMP
 
 choice
 	prompt "UniPhier SoC select"
+	optional
 
 config MACH_PH1_PRO4
 	bool "PH1-Pro4"
diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index 1046ece..483c3a0 100644
--- a/arch/arm/mach-zynq/Kconfig
+++ b/arch/arm/mach-zynq/Kconfig
@@ -2,6 +2,7 @@ if ARCH_ZYNQ
 
 choice
 	prompt "Xilinx Zynq board select"
+	optional
 
 config TARGET_ZYNQ_ZED
 	bool "Zynq ZedBoard"
diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index 66de2ad..c69654c 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -6,6 +6,7 @@ config SYS_ARCH
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_ATNGW100
 	bool "Support atngw100"
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 31913fe..0a2fb4d 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -6,6 +6,7 @@ config SYS_ARCH
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_BCT_BRETTL2
 	bool "Support bct-brettl2"
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 6f419f0..077b2a7 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -6,6 +6,7 @@ config SYS_ARCH
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_MICROBLAZE_GENERIC
 	bool "Support microblaze-generic"
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index b0a8a43..feb2f68 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -13,6 +13,7 @@ config USE_PRIVATE_LIBGCC
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_QEMU_MIPS
 	bool "Support qemu-mips"
diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig
index 81b0a01..98b0282 100644
--- a/arch/nds32/Kconfig
+++ b/arch/nds32/Kconfig
@@ -6,6 +6,7 @@ config SYS_ARCH
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_ADP_AG101
 	bool "Support adp-ag101"
diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index b3be7b5..8ae7f6e 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -6,6 +6,7 @@ config SYS_ARCH
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_NIOS2_GENERIC
 	bool "Support nios2-generic"
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index 4d62b4c..11014d1 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -6,6 +6,7 @@ config SYS_ARCH
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_OPENRISC_GENERIC
 	bool "Support openrisc-generic"
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 8e5a3e2..3b3f446 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -6,6 +6,7 @@ config SYS_ARCH
 
 choice
 	prompt "CPU select"
+	optional
 
 config MPC512X
 	bool "MPC512X"
diff --git a/arch/powerpc/cpu/mpc512x/Kconfig b/arch/powerpc/cpu/mpc512x/Kconfig
index a0f0ede..53450ae 100644
--- a/arch/powerpc/cpu/mpc512x/Kconfig
+++ b/arch/powerpc/cpu/mpc512x/Kconfig
@@ -6,6 +6,7 @@ config SYS_CPU
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_PDM360NG
 	bool "Support pdm360ng"
diff --git a/arch/powerpc/cpu/mpc5xx/Kconfig b/arch/powerpc/cpu/mpc5xx/Kconfig
index aad4a7c..5275447 100644
--- a/arch/powerpc/cpu/mpc5xx/Kconfig
+++ b/arch/powerpc/cpu/mpc5xx/Kconfig
@@ -6,6 +6,7 @@ config SYS_CPU
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_CMI_MPC5XX
 	bool "Support cmi_mpc5xx"
diff --git a/arch/powerpc/cpu/mpc5xxx/Kconfig b/arch/powerpc/cpu/mpc5xxx/Kconfig
index eec9d7d..5d49228 100644
--- a/arch/powerpc/cpu/mpc5xxx/Kconfig
+++ b/arch/powerpc/cpu/mpc5xxx/Kconfig
@@ -6,6 +6,7 @@ config SYS_CPU
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_A3M071
 	bool "Support a3m071"
diff --git a/arch/powerpc/cpu/mpc8260/Kconfig b/arch/powerpc/cpu/mpc8260/Kconfig
index 55941c8..e93732d 100644
--- a/arch/powerpc/cpu/mpc8260/Kconfig
+++ b/arch/powerpc/cpu/mpc8260/Kconfig
@@ -6,6 +6,7 @@ config SYS_CPU
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_KM82XX
 	bool "Support km82xx"
diff --git a/arch/powerpc/cpu/mpc83xx/Kconfig b/arch/powerpc/cpu/mpc83xx/Kconfig
index 88a3bd6..3fb901f 100644
--- a/arch/powerpc/cpu/mpc83xx/Kconfig
+++ b/arch/powerpc/cpu/mpc83xx/Kconfig
@@ -6,6 +6,7 @@ config SYS_CPU
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_MPC8308_P1M
 	bool "Support mpc8308_p1m"
diff --git a/arch/powerpc/cpu/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index aff5fdb..3e8d0b1 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -6,6 +6,7 @@ config SYS_CPU
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_SBC8548
 	bool "Support sbc8548"
diff --git a/arch/powerpc/cpu/mpc86xx/Kconfig b/arch/powerpc/cpu/mpc86xx/Kconfig
index 14e8b1a..fe1859d 100644
--- a/arch/powerpc/cpu/mpc86xx/Kconfig
+++ b/arch/powerpc/cpu/mpc86xx/Kconfig
@@ -6,6 +6,7 @@ config SYS_CPU
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_SBC8641D
 	bool "Support sbc8641d"
diff --git a/arch/powerpc/cpu/mpc8xx/Kconfig b/arch/powerpc/cpu/mpc8xx/Kconfig
index e8bcbe9..79cee35 100644
--- a/arch/powerpc/cpu/mpc8xx/Kconfig
+++ b/arch/powerpc/cpu/mpc8xx/Kconfig
@@ -6,6 +6,7 @@ config SYS_CPU
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_TQM823L
 	bool "Support TQM823L"
diff --git a/arch/powerpc/cpu/ppc4xx/Kconfig b/arch/powerpc/cpu/ppc4xx/Kconfig
index 4d5954a..10b86e0 100644
--- a/arch/powerpc/cpu/ppc4xx/Kconfig
+++ b/arch/powerpc/cpu/ppc4xx/Kconfig
@@ -6,6 +6,7 @@ config SYS_CPU
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_CSB272
 	bool "Support csb272"
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 2128f23..2f7a2fe 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -29,6 +29,7 @@ config SH_32BIT
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_RSK7203
 	bool "RSK+ 7203"
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 2df09b2..04dc08f 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -14,6 +14,7 @@ config LEON3
 
 choice
 	prompt "Board select"
+	optional
 
 config TARGET_GRSIM_LEON2
 	bool "GRSIM simulating a LEON2 board"
diff --git a/board/amcc/canyonlands/Kconfig b/board/amcc/canyonlands/Kconfig
index ef66ad4..a655dbc 100644
--- a/board/amcc/canyonlands/Kconfig
+++ b/board/amcc/canyonlands/Kconfig
@@ -11,6 +11,7 @@ config SYS_CONFIG_NAME
 
 choice BOARD_TYPE
 	prompt "Select which board to build for"
+	optional
 
 config CANYONLANDS
 	bool "Glacier"
diff --git a/board/coreboot/Kconfig b/board/coreboot/Kconfig
index dc9b70f..ede6065 100644
--- a/board/coreboot/Kconfig
+++ b/board/coreboot/Kconfig
@@ -8,6 +8,7 @@ if VENDOR_COREBOOT
 
 choice
 	prompt "Mainboard model"
+	optional
 
 config TARGET_COREBOOT
 	bool "coreboot"
diff --git a/board/dbau1x00/Kconfig b/board/dbau1x00/Kconfig
index 1286e45..b813adb 100644
--- a/board/dbau1x00/Kconfig
+++ b/board/dbau1x00/Kconfig
@@ -13,6 +13,7 @@ menu "dbau1x00 board options"
 
 choice
 	prompt "Select au1x00 SoC type"
+	optional
 
 config DBAU1100
 	bool "Select AU1100"
diff --git a/board/google/Kconfig b/board/google/Kconfig
index 302f68e..e9559c9 100644
--- a/board/google/Kconfig
+++ b/board/google/Kconfig
@@ -8,6 +8,7 @@ if VENDOR_GOOGLE
 
 choice
 	prompt "Mainboard model"
+	optional
 
 config TARGET_CHROMEBOOK_LINK
 	bool "Chromebook link"
diff --git a/board/intel/Kconfig b/board/intel/Kconfig
index 7fe21b9..3d9ecf0 100644
--- a/board/intel/Kconfig
+++ b/board/intel/Kconfig
@@ -8,6 +8,7 @@ if VENDOR_INTEL
 
 choice
 	prompt "Mainboard model"
+	optional
 
 config TARGET_CROWNBAY
 	bool "Crown Bay"
diff --git a/board/micronas/vct/Kconfig b/board/micronas/vct/Kconfig
index 288a1ae..c518079 100644
--- a/board/micronas/vct/Kconfig
+++ b/board/micronas/vct/Kconfig
@@ -13,6 +13,7 @@ menu "vct board options"
 
 choice
 	prompt "Board variant"
+	optional
 
 config VCT_PLATINUM
 	bool "Enable VCT_PLATINUM"
diff --git a/board/seco/Kconfig b/board/seco/Kconfig
index dcb1ac8..af16697 100644
--- a/board/seco/Kconfig
+++ b/board/seco/Kconfig
@@ -2,6 +2,7 @@ if TARGET_SECOMX6
 
 choice
 	prompt "SECO i.MX6 Board variant"
+	optional
 
 config SECOMX6_Q7
 	bool "Q7"
@@ -16,6 +17,7 @@ endchoice
 
 choice
 	prompt "SECO i.MX6 SoC variant"
+	optional
 
 config SECOMX6Q
 	bool "i.MX6Q"
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index a60d028..c60c81d 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -18,6 +18,7 @@ config SUNXI_GEN_SUN6I
 
 choice
 	prompt "Sunxi SoC Variant"
+	optional
 
 config MACH_SUN4I
 	bool "sun4i (Allwinner A10)"
