This is the same migration path as commit b6251db8c3f0 ("Kconfig:
Introduce USE_BOOTCOMMAND and migrate BOOTCOMMAND").

I also moved the description in README to the Kconfig help.
I ripped off the sentence about 'LWMON' since it is gone already.

I only let my boards migrate, leaving the rest to platform maintainers.

Signed-off-by: Masahiro Yamada <yamada.masah...@socionext.com>
---

 README                              | 16 ----------------
 common/Kconfig                      | 18 ++++++++++++++++++
 configs/uniphier_ld4_sld8_defconfig |  2 ++
 configs/uniphier_v7_defconfig       |  2 ++
 configs/uniphier_v8_defconfig       |  2 ++
 include/configs/uniphier.h          |  2 --
 6 files changed, 24 insertions(+), 18 deletions(-)

diff --git a/README b/README
index b81500f..1d9b485 100644
--- a/README
+++ b/README
@@ -687,22 +687,6 @@ The following options need to be configured:
                as a convenience, when switching between booting from
                RAM and NFS.
 
-- Pre-Boot Commands:
-               CONFIG_PREBOOT
-
-               When this option is #defined, the existence of the
-               environment variable "preboot" will be checked
-               immediately before starting the CONFIG_BOOTDELAY
-               countdown and/or running the auto-boot command resp.
-               entering interactive mode.
-
-               This feature is especially useful when "preboot" is
-               automatically generated or modified. For an example
-               see the LWMON board specific code: here "preboot" is
-               modified when the user holds down a certain
-               combination of keys on the (special) keyboard when
-               booting the systems
-
 - Serial Download Echo Mode:
                CONFIG_LOADS_ECHO
                If defined to 1, all characters received during a
diff --git a/common/Kconfig b/common/Kconfig
index 0a14bde..70b8091 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -232,6 +232,24 @@ config BOOTCOMMAND
          This is the string of commands that will be used as bootcmd and if
          AUTOBOOT is set, automatically run.
 
+config USE_PREBOOT
+       bool "Enable preboot"
+       help
+         When this option is enabled, the existence of the environment
+         variable "preboot" will be checked immediately before starting the
+         CONFIG_BOOTDELAY countdown and/or running the auto-boot command resp.
+         entering interactive mode.
+
+         This feature is especially useful when "preboot" is automatically
+         generated or modified. For example, the boot code can modify the
+         "preboot" when a user holds down a certain combination of keys.
+
+config PREBOOT
+       string "preboot default value"
+       depends on USE_PREBOOT
+       help
+         This is the default of "preboot" environment variable.
+
 menu "Console"
 
 config MENU
diff --git a/configs/uniphier_ld4_sld8_defconfig 
b/configs/uniphier_ld4_sld8_defconfig
index 48f7ac4..de9182e 100644
--- a/configs/uniphier_ld4_sld8_defconfig
+++ b/configs/uniphier_ld4_sld8_defconfig
@@ -10,6 +10,8 @@ CONFIG_MICRO_SUPPORT_CARD=y
 CONFIG_NR_DRAM_BANKS=3
 # CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
 CONFIG_BOOTCOMMAND="run ${bootdev}script; run ${bootdev}boot"
+CONFIG_USE_PREBOOT=y
+CONFIG_PREBOOT="env exist ${bootdev}preboot && run ${bootdev}preboot"
 CONFIG_LOGLEVEL=6
 CONFIG_SPL_NAND_SUPPORT=y
 CONFIG_SPL_NOR_SUPPORT=y
diff --git a/configs/uniphier_v7_defconfig b/configs/uniphier_v7_defconfig
index f7abf05..bb9ce1a 100644
--- a/configs/uniphier_v7_defconfig
+++ b/configs/uniphier_v7_defconfig
@@ -9,6 +9,8 @@ CONFIG_MICRO_SUPPORT_CARD=y
 CONFIG_NR_DRAM_BANKS=3
 # CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
 CONFIG_BOOTCOMMAND="run ${bootdev}script; run ${bootdev}boot"
+CONFIG_USE_PREBOOT=y
+CONFIG_PREBOOT="env exist ${bootdev}preboot && run ${bootdev}preboot"
 CONFIG_LOGLEVEL=6
 CONFIG_SPL_NAND_SUPPORT=y
 CONFIG_SPL_NOR_SUPPORT=y
diff --git a/configs/uniphier_v8_defconfig b/configs/uniphier_v8_defconfig
index 1ba1c7d..08dfa24 100644
--- a/configs/uniphier_v8_defconfig
+++ b/configs/uniphier_v8_defconfig
@@ -8,6 +8,8 @@ CONFIG_MICRO_SUPPORT_CARD=y
 CONFIG_NR_DRAM_BANKS=3
 # CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
 CONFIG_BOOTCOMMAND="run ${bootdev}script; run ${bootdev}boot"
+CONFIG_USE_PREBOOT=y
+CONFIG_PREBOOT="env exist ${bootdev}preboot && run ${bootdev}preboot"
 CONFIG_LOGLEVEL=6
 CONFIG_CMD_CONFIG=y
 CONFIG_CMD_IMLS=y
diff --git a/include/configs/uniphier.h b/include/configs/uniphier.h
index 95d6452..1e509ce 100644
--- a/include/configs/uniphier.h
+++ b/include/configs/uniphier.h
@@ -124,8 +124,6 @@
        "third_image=u-boot.bin\0"
 #endif
 
-#define CONFIG_PREBOOT                 "env exist ${bootdev}preboot && run 
${bootdev}preboot"
-
 #define CONFIG_ROOTPATH                        "/nfs/root/path"
 #define CONFIG_NFSBOOTCOMMAND                                          \
        "setenv bootargs $bootargs root=/dev/nfs rw "                   \
-- 
2.7.4

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