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From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>
Date: Tue, 13 Dec 2011 21:37:46 +0100
Subject: [PATCH] HACK! don't reserve memory for device tree if it's below
PHYS_OFFSET
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This allows to keep the device tree blob in the unregistered 128k SRAM
on efm32.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
arch/arm/kernel/devtree.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c
index 5859c8b..134e0c8 100644
--- a/arch/arm/kernel/devtree.c
+++ b/arch/arm/kernel/devtree.c
@@ -43,6 +43,10 @@ void __init arm_dt_memblock_reserve(void)
if (!initial_boot_params)
return;
+ if ((unsigned long)initial_boot_params < PHYS_OFFSET)
+ /* assume the dtb is located in ro memory */
+ return;
+
/* Reserve the dtb region */
memblock_reserve(virt_to_phys(initial_boot_params),
be32_to_cpu(initial_boot_params->totalsize));
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