From: Bin Meng <bmeng.cn@gmail.com>
Date: Fri, 21 Apr 2017 14:24:40 +0000 (-0700)
Subject: x86: Do not clear high table area for S3
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=95e50dd197cb86641a4ad06a18d5a4c57ea0a6f4;p=project%2Fbcm63xx%2Fu-boot.git

x86: Do not clear high table area for S3

When SeaBIOS is being used, U-Boot reserves a memory area to be
used for configuration tables like ACPI. But it should not be
cleared otherwise ACPI table will be missing.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Stefan Roese <sr@denx.de>
---

diff --git a/arch/x86/lib/coreboot_table.c b/arch/x86/lib/coreboot_table.c
index ceab3cf5e4..b1b4cd9613 100644
--- a/arch/x86/lib/coreboot_table.c
+++ b/arch/x86/lib/coreboot_table.c
@@ -6,6 +6,7 @@
 
 #include <common.h>
 #include <vbe.h>
+#include <asm/acpi_s3.h>
 #include <asm/coreboot_tables.h>
 #include <asm/e820.h>
 
@@ -19,7 +20,11 @@ int high_table_reserve(void)
 	gd->arch.high_table_ptr = gd->start_addr_sp;
 
 	/* clear the memory */
-	memset((void *)gd->arch.high_table_ptr, 0, CONFIG_HIGH_TABLE_SIZE);
+#ifdef CONFIG_HAVE_ACPI_RESUME
+	if (gd->arch.prev_sleep_state != ACPI_S3)
+#endif
+		memset((void *)gd->arch.high_table_ptr, 0,
+		       CONFIG_HIGH_TABLE_SIZE);
 
 	gd->start_addr_sp &= ~0xf;