[U-Boot] [PATCH 2/2] ARM: rpi: set fdt_high in the default environment

[Stephen Warren]

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 at collabora.com>
Signed-off-by: Stephen Warren <swarren at 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 00a5266dad15..b564eb690633 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" \
-- 
1.9.1