From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001
From: James <>
Date: Wed, 4 Nov 2015 11:49:21 +0000
Subject: trunk-47381

---
 .../300-arch-arm-force-ZRELADDR-on-arch-qcom.patch | 62 ++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 target/linux/ipq806x/patches-3.18/300-arch-arm-force-ZRELADDR-on-arch-qcom.patch

(limited to 'target/linux/ipq806x/patches-3.18/300-arch-arm-force-ZRELADDR-on-arch-qcom.patch')

diff --git a/target/linux/ipq806x/patches-3.18/300-arch-arm-force-ZRELADDR-on-arch-qcom.patch b/target/linux/ipq806x/patches-3.18/300-arch-arm-force-ZRELADDR-on-arch-qcom.patch
new file mode 100644
index 0000000..8669b02
--- /dev/null
+++ b/target/linux/ipq806x/patches-3.18/300-arch-arm-force-ZRELADDR-on-arch-qcom.patch
@@ -0,0 +1,62 @@
+From b12e230f09d4481424e6a5d7e2ae566b6954e83f Mon Sep 17 00:00:00 2001
+From: Mathieu Olivari <mathieu@codeaurora.org>
+Date: Wed, 29 Apr 2015 15:21:46 -0700
+Subject: [PATCH] HACK: arch: arm: force ZRELADDR on arch-qcom
+
+ARCH_QCOM is using the ARCH_MULTIPLATFORM option, as now recommended
+on most ARM architectures. This automatically calculate ZRELADDR by
+masking PHYS_OFFSET with 0xf8000000.
+
+However, on IPQ806x, the first ~20MB of RAM is reserved for the hardware
+network accelerators, and the bootloader removes this section from the
+layout passed from the ATAGS (when used).
+
+For newer bootloader, when DT is used, this is not a problem, we just
+reserve this memory in the device tree. But if the bootloader doesn't
+have DT support, then ATAGS have to be used. In this case, the ARM
+decompressor will position the kernel in this low mem, which will not be
+in the RAM section mapped by the bootloader, which means the kernel will
+freeze in the middle of the boot process trying to map the memory.
+
+As a work around, this patch allows disabling AUTO_ZRELADDR when
+ARCH_QCOM is selected. It makes the zImage usage possible on bootloaders
+which don't support device-tree, which is the case on certain early
+IPQ806x based designs.
+
+Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>
+---
+ arch/arm/Kconfig                 | 2 +-
+ arch/arm/Makefile                | 2 ++
+ arch/arm/mach-qcom/Makefile.boot | 1 +
+ 3 files changed, 4 insertions(+), 1 deletion(-)
+ create mode 100644 arch/arm/mach-qcom/Makefile.boot
+
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -311,7 +311,7 @@ config ARCH_MULTIPLATFORM
+ 	select ARCH_WANT_OPTIONAL_GPIOLIB
+ 	select ARM_HAS_SG_CHAIN
+ 	select ARM_PATCH_PHYS_VIRT
+-	select AUTO_ZRELADDR
++	select AUTO_ZRELADDR if !ARCH_QCOM
+ 	select CLKSRC_OF
+ 	select COMMON_CLK
+ 	select GENERIC_CLOCKEVENTS
+--- a/arch/arm/Makefile
++++ b/arch/arm/Makefile
+@@ -248,9 +248,11 @@ MACHINE  := arch/arm/mach-$(word 1,$(mac
+ else
+ MACHINE  :=
+ endif
++ifeq ($(CONFIG_ARCH_QCOM),)
+ ifeq ($(CONFIG_ARCH_MULTIPLATFORM),y)
+ MACHINE  :=
+ endif
++endif
+ 
+ machdirs := $(patsubst %,arch/arm/mach-%/,$(machine-y))
+ platdirs := $(patsubst %,arch/arm/plat-%/,$(sort $(plat-y)))
+--- /dev/null
++++ b/arch/arm/mach-qcom/Makefile.boot
+@@ -0,0 +1 @@
++zreladdr-y+= 0x42208000
-- 
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