[U-Boot] [PATCH v2 20/22] x86: Disable CAR before relocation on platforms that need it

[Simon Glass]

For platforms with CAR we should disable it before relocation. Check if
this function is available and call it if so.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v2:
- Use a simple call instruction to call car_uninit

 arch/x86/cpu/start.S | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index 125782c..be8a2dc 100644
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -205,6 +205,15 @@ board_init_f_r_trampoline:
 	/* Setup global descriptor table so gd->xyz works */
 	call	setup_gdt
 
+	/* Set if we need to disable CAR */
+.weak	car_uninit
+	movl	$car_uninit, %eax
+	cmpl	$0, %eax
+	jz	1f
+
+	/* Pass return address in ebx */
+	call	car_uninit
+1:
 	/* Re-enter U-Boot by calling board_init_f_r */
 	call	board_init_f_r
 
-- 
2.2.0.rc0.207.ga3a616c