From 89ca1000caefcfaeb06fdb9fcc8fdc09c318d26a Mon Sep 17 00:00:00 2001
From: Stephen Warren <swarren@wwwdotorg.org>
Date: Fri, 5 Feb 2016 22:45:47 -0700
Subject: [PATCH] ARM: rpi: set fdt_high in the default environment

The ARM Linux kernel requires the DT to be in memory accessible early
during the boot process. This always happens naturally on the RPi 1,
since the maximum memory size of 512MiB, and additionally some of that
is reserved for use by the GPU. The RPi 2 has 1GiB of RAM (minus some
GPU usage), and so if the DT is relocated to the top of RAM, Linux cannot
access it. Prevent this from happening by setting fdt_high.

Cc: Daniel Stone <daniels@collabora.com>
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
---
 include/configs/rpi-common.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/configs/rpi-common.h b/include/configs/rpi-common.h
index 29510f5c9c..48f5fc2d03 100644
--- a/include/configs/rpi-common.h
+++ b/include/configs/rpi-common.h
@@ -172,6 +172,7 @@
  *   for any boot script to be up to 1M, which is hopefully plenty.
  */
 #define ENV_MEM_LAYOUT_SETTINGS \
+	"fdt_high=ffffffff\0" \
 	"fdt_addr_r=0x00000100\0" \
 	"pxefile_addr_r=0x00100000\0" \
 	"kernel_addr_r=0x01000000\0" \
-- 
2.39.5