env: Allow to build multiple environments in Kconfig

Now that we have everything in place in the code, let's allow to build
multiple environments backend through Kconfig.

Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

configs/MPC8313ERDB_NAND_33_defconfig

@@ -22,6 +22,7 @@ CONFIG_CMD_DATE=y
 CONFIG_CMD_MTDPARTS=y
 CONFIG_MTDIDS_DEFAULT="nand0=e2800000.flash"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=e2800000.flash:512k(uboot),128k(env),6m@1m(kernel),-(fs)"
+# CONFIG_ENV_IS_IN_FLASH is not set
 CONFIG_ENV_IS_IN_NAND=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y

configs/MPC8313ERDB_NAND_66_defconfig

@@ -22,6 +22,7 @@ CONFIG_CMD_DATE=y
 CONFIG_CMD_MTDPARTS=y
 CONFIG_MTDIDS_DEFAULT="nand0=e2800000.flash"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=e2800000.flash:512k(uboot),128k(env),6m@1m(kernel),-(fs)"
+# CONFIG_ENV_IS_IN_FLASH is not set
 CONFIG_ENV_IS_IN_NAND=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y

configs/cl-som-imx7_defconfig

@@ -41,6 +41,7 @@ CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
+# CONFIG_ENV_IS_IN_MMC is not set
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y

configs/microblaze-generic_defconfig

@@ -40,7 +40,6 @@ CONFIG_CMD_UBI=y
 # CONFIG_CMD_UBIFS is not set
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_OF_EMBED=y
-CONFIG_ENV_IS_IN_FLASH=y
 CONFIG_NETCONSOLE=y
 CONFIG_SPL_DM=y
 CONFIG_MTD_NOR_FLASH=y

env/Kconfig

@@ -1,38 +1,18 @@
 menu "Environment"
 
-choice
-	prompt "Select the location of the environment"
-	default ENV_IS_IN_MMC if ARCH_SUNXI
-	default ENV_IS_IN_MMC if ARCH_EXYNOS4
-	default ENV_IS_IN_MMC if MX6SX || MX7D
-	default ENV_IS_IN_MMC if TEGRA30 || TEGRA124
-	default ENV_IS_IN_MMC if TEGRA_ARMV8_COMMON
-	default ENV_IS_IN_FLASH if ARCH_CINTEGRATOR
-	default ENV_IS_IN_FLASH if ARCH_INTEGRATOR_CP
-	default ENV_IS_IN_FLASH if M548x || M547x || M5282 || MCF547x_8x
-	default ENV_IS_IN_FLASH if MCF532x || MCF52x2
-	default ENV_IS_IN_FLASH if MPC86xx || MPC83xx
-	default ENV_IS_IN_FLASH if ARCH_MPC8572 || ARCH_MPC8548 || ARCH_MPC8641
-	default ENV_IS_IN_FLASH if SH && !CPU_SH4
-	default ENV_IS_IN_SPI_FLASH if ARMADA_XP
-	default ENV_IS_IN_SPI_FLASH if INTEL_BAYTRAIL
-	default ENV_IS_IN_SPI_FLASH if INTEL_BRASWELL
-	default ENV_IS_IN_SPI_FLASH if INTEL_BROADWELL
-	default ENV_IS_IN_SPI_FLASH if NORTHBRIDGE_INTEL_IVYBRIDGE
-	default ENV_IS_IN_SPI_FLASH if INTEL_QUARK
-	default ENV_IS_IN_SPI_FLASH if INTEL_QUEENSBAY
-	default ENV_IS_IN_FAT if ARCH_BCM283X
-	default ENV_IS_IN_FAT if MMC_OMAP_HS && TI_COMMON_CMD_OPTIONS
-	default ENV_IS_NOWHERE
-	help
-	  At present the environment can be stored in only one place. Use this
-	  option to select the location. This is either a device (where the
-	  environemnt information is simply written to a fixed location or
-	  partition on the device) or a filesystem (where the environment
-	  information is written to a file).
-
 config ENV_IS_NOWHERE
 	bool "Environment is not stored"
+	depends on !ENV_IS_IN_EEPROM
+	depends on !ENV_IS_IN_FAT
+	depends on !ENV_IS_IN_FLASH
+	depends on !ENV_IS_IN_MMC
+	depends on !ENV_IS_IN_NAND
+	depends on !ENV_IS_IN_NVRAM
+	depends on !ENV_IS_IN_ONENAND
+	depends on !ENV_IS_IN_REMOTE
+	depends on !ENV_IS_IN_SPI_FLASH
+	depends on !ENV_IS_IN_UBI
+	default y
 	help
 	  Define this if you don't want to or can't have an environment stored
 	  on a storage medium. In this case the environemnt will still exist
@@ -74,6 +54,8 @@ config ENV_IS_IN_EEPROM
 config ENV_IS_IN_FAT
 	bool "Environment is in a FAT filesystem"
 	depends on !CHAIN_OF_TRUST
+	default y if ARCH_BCM283X
+	default y if MMC_OMAP_HS && TI_COMMON_CMD_OPTIONS
 	select FS_FAT
 	select FAT_WRITE
 	help
@@ -89,6 +71,13 @@ config ENV_IS_IN_EXT4
 config ENV_IS_IN_FLASH
 	bool "Environment in flash memory"
 	depends on !CHAIN_OF_TRUST
+	default y if ARCH_CINTEGRATOR
+	default y if ARCH_INTEGRATOR_CP
+	default y if M548x || M547x || M5282 || MCF547x_8x
+	default y if MCF532x || MCF52x2
+	default y if MPC86xx || MPC83xx
+	default y if ARCH_MPC8572 || ARCH_MPC8548 || ARCH_MPC8641
+	default y if SH && !CPU_SH4
 	help
 	  Define this if you have a flash device which you want to use for the
 	  environment.
@@ -162,6 +151,11 @@ config ENV_IS_IN_MMC
 	bool "Environment in an MMC device"
 	depends on !CHAIN_OF_TRUST
 	depends on MMC
+	default y if ARCH_SUNXI
+	default y if ARCH_EXYNOS4
+	default y if MX6SX || MX7D
+	default y if TEGRA30 || TEGRA124
+	default y if TEGRA_ARMV8_COMMON
 	help
 	  Define this if you have an MMC device which you want to use for the
 	  environment.
@@ -299,6 +293,13 @@ config ENV_IS_IN_REMOTE
 config ENV_IS_IN_SPI_FLASH
 	bool "Environment is in SPI flash"
 	depends on !CHAIN_OF_TRUST
+	default y if ARMADA_XP
+	default y if INTEL_BAYTRAIL
+	default y if INTEL_BRASWELL
+	default y if INTEL_BROADWELL
+	default y if NORTHBRIDGE_INTEL_IVYBRIDGE
+	default y if INTEL_QUARK
+	default y if INTEL_QUEENSBAY
 	help
 	  Define this if you have a SPI Flash memory device which you
 	  want to use for the environment.
@@ -364,8 +365,6 @@ config ENV_IS_IN_UBI
 	  You will probably want to define these to avoid a really noisy system
 	  when storing the env in UBI.
 
-endchoice
-
 config ENV_FAT_INTERFACE
 	string "Name of the block device for the environment"
 	depends on ENV_IS_IN_FAT