[U-Boot] [PATCH v1] x86: make LOAD_FROM_32_BIT visible for platforms

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

This option useful not only for development, but for the platforms where
U-Boot is run from custom ROM bootloader. For example, Intel Edison is
that board.

Make this option visible that platforms can select it if needed.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 arch/x86/Kconfig     | 4 ++++
 arch/x86/cpu/start.S | 3 +--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0884af22a7..d75ad61d99 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -89,6 +89,10 @@ config X86_RESET_VECTOR
 	bool
 	default n
 
+config X86_LOAD_FROM_32_BIT
+	bool
+	default n
+
 config RESET_SEG_START
 	hex
 	depends on X86_RESET_VECTOR
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index a5cba1cf2a..eb4ade6f8c 100644
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -22,9 +22,8 @@
  * Define this to boot U-Boot from a 32-bit program which sets the GDT
  * differently. This can be used to boot directly from any stage of coreboot,
  * for example, bypassing the normal payload-loading feature.
- * This is only useful for development.
  */
-#undef LOAD_FROM_32_BIT
+#define LOAD_FROM_32_BIT CONFIG_X86_LOAD_FROM_32_BIT
 
 .section .text
 .code32
-- 
2.11.0