From d1cd045982b1e1e4db2c1cc2b2b932f739b78a11 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Wed, 12 Nov 2014 22:42:09 -0700
Subject: x86: Emit post codes in startup code for Chromebooks

On x86 it is common to use 'post codes' which are 8-bit hex values emitted
from the code and visible to the user. Traditionally two 7-segment displays
were made available on the motherboard to show the last post code that was
emitted. This allows diagnosis of a boot problem since it is possible to
see where the code got to before it died.

On modern hardware these codes are not normally visible. On Chromebooks
they are displayed by the Embedded Controller (EC), so it is useful to emit
them. We must enable this feature for the EC to see the codes, so add an
option for this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
---
 arch/x86/cpu/coreboot/coreboot.c | 3 ++-
 arch/x86/cpu/start.S             | 4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

(limited to 'arch/x86/cpu')

diff --git a/arch/x86/cpu/coreboot/coreboot.c b/arch/x86/cpu/coreboot/coreboot.c
index 85017165c0..0760a61d84 100644
--- a/arch/x86/cpu/coreboot/coreboot.c
+++ b/arch/x86/cpu/coreboot/coreboot.c
@@ -15,6 +15,7 @@
 #include <asm/cache.h>
 #include <asm/cpu.h>
 #include <asm/io.h>
+#include <asm/post.h>
 #include <asm/arch-coreboot/tables.h>
 #include <asm/arch-coreboot/sysinfo.h>
 #include <asm/arch/timestamp.h>
@@ -70,7 +71,7 @@ void show_boot_progress(int val)
 		gd->arch.tsc_prev = now;
 	}
 #endif
-	outb(val, 0x80);
+	outb(val, POST_PORT);
 }
 
 int print_cpuinfo(void)
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index b18f3201bc..1b738f9916 100644
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -13,6 +13,7 @@
 #include <config.h>
 #include <version.h>
 #include <asm/global_data.h>
+#include <asm/post.h>
 #include <asm/processor.h>
 #include <asm/processor-flags.h>
 #include <generated/generic-asm-offsets.h>
@@ -67,6 +68,7 @@ _start:
 	jmp	early_board_init
 .globl early_board_init_ret
 early_board_init_ret:
+	post_code(POST_START)
 
 	/* Initialise Cache-As-RAM */
 	jmp	car_init
@@ -96,6 +98,7 @@ car_init_ret:
 
 	/* Align global data to 16-byte boundary */
 	andl	$0xfffffff0, %esp
+	post_code(POST_START_STACK)
 
 	/* Zero the global data since it won't happen later */
 	xorl	%eax, %eax
@@ -131,6 +134,7 @@ car_init_ret:
 	call	setup_gdt
 
 	/* Set parameter to board_init_f() to boot flags */
+	post_code(POST_START_DONE)
 	xorl	%eax, %eax
 
 	/* Enter, U-boot! */
-- 
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