From: Ken Sumrall <ksumrall@android.com>
Date: Wed, 29 Sep 2010 03:40:59 +0000 (-0700)
Subject: Reserve the first 4K of phys ram for safety from errant drivers/hardware.
X-Git-Tag: firefly_0821_release~9834^2~511
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=178d2c3f85d9e9198358e0d008bc8feb78a55e60;p=firefly-linux-kernel-4.4.55.git

Reserve the first 4K of phys ram for safety from errant drivers/hardware.

Signed-off-by: Ken Sumrall <ksumrall@android.com>
---

diff --git a/arch/arm/mach-tegra/board-stingray.c b/arch/arm/mach-tegra/board-stingray.c
index f013e6458499..ece5dd386322 100644
--- a/arch/arm/mach-tegra/board-stingray.c
+++ b/arch/arm/mach-tegra/board-stingray.c
@@ -30,6 +30,7 @@
 #include <linux/reboot.h>
 #include <linux/i2c-tegra.h>
 #include <linux/spi/cpcap.h>
+#include <linux/bootmem.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -1044,6 +1045,10 @@ static void __init tegra_stingray_init(void)
 
 void __init stingray_map_io(void)
 {
+	if (reserve_bootmem(0x0, 4096, BOOTMEM_EXCLUSIVE) != 0) {
+		printk(KERN_WARNING "Cannot reserve first 4K of memory for safety\n");
+	}
+
 	tegra_map_common_io();
 	stingray_fb_alloc();
 }