[PATCH v1] Revert "x86: use invd instead of wbinvd in real mode start code"

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

This reverts commit 0d67fac29f3187e67f4fd3ef15f73e91be2fad12.

As real hardware testing (*) shows the above mentioned commit
breaks U-Boot on it. Revert for the upcoming release. We may get
more information in the future and optimize the code accordingly.

(*) om Intel Edison board.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 arch/x86/cpu/start.S   | 2 +-
 arch/x86/cpu/start16.S | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index 26cf995db2..01524635e9 100644
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -50,7 +50,7 @@ _x86boot_start:
 	movl	%cr0, %eax
 	orl	$(X86_CR0_NW | X86_CR0_CD), %eax
 	movl	%eax, %cr0
-	invd
+	wbinvd
 
 	/*
 	 * Zero the BIST (Built-In Self Test) value since we don't have it.
diff --git a/arch/x86/cpu/start16.S b/arch/x86/cpu/start16.S
index 292e750508..54f4ff6662 100644
--- a/arch/x86/cpu/start16.S
+++ b/arch/x86/cpu/start16.S
@@ -28,7 +28,7 @@ start16:
 	movl	%cr0, %eax
 	orl	$(X86_CR0_NW | X86_CR0_CD), %eax
 	movl	%eax, %cr0
-	invd
+	wbinvd
 
 	/* load the temporary Global Descriptor Table */
 data32 cs	lidt	idt_ptr
-- 
2.25.0