linux-kernel - [PATCH CFT] ARM:EP93XX: Enable ARM_PATCH_PHYS_VIRT and AUTO

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Date:	Thu,  9 Jan 2014 14:49:24 +0530
From:	panchaxari <panchaxari.prasannamurthy@...aro.org>
To:	hsweeten@...ionengravers.com
Cc:	patches@...aro.org, linaro-kernel@...ts.linaro.org,
	panchaxari.prasannamurthy@...aro.org,
	Ryan Mallon <rmallon@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH CFT] ARM:EP93XX: Enable ARM_PATCH_PHYS_VIRT and AUTO_ZRELADDR by default

This patch enables ARM_PATCH_PHYS_VIRT and AUTO_ZRELADDR as default configs
to EP93XX platforms from Cirrus.

Introduction of PHYS_VIRT config as default config enables phy-to-virt and
virt-to-phy translation functions at boot and module loading time, and enforce
dynamic reallocation of memory. PHYS_VIRT config is mutually exclusive to
XIP_KERNEL, XIP_KERNEL is used in systems with NOR flash devices.

AUTO_ZRELADDR config enables auto calculation of the decompressed kernel image
address. AUTO_ZRELADDR config is mutually exclusive to ZBOOT_ROM, and also
assumes zImage to be loaded in the first 128MiB from start of memory.

CFT::Call For Testing

Requesting maintainers of EP93XX platform to evaluate the changes on the
board and comment, as I dont have the board for testing and also requesting
an ACK.

Signed-off-by: panchaxari <panchaxari.prasannamurthy@...aro.org>
Cc: Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: Ryan Mallon <rmallon@...il.com>
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Russell King <linux@....linux.org.uk>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
Below lkml link is a quoting by Russell which explains more on concept of
PHYS_VIRT and ZRELADDR
-------------------------------------------------

https://lkml.org/lkml/2011/10/14/434

-------------------------------------------------
---
 arch/arm/Kconfig |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 3501362..077ef9d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -420,10 +420,12 @@ config ARCH_EBSA110
 config ARCH_EP93XX
 	bool "EP93xx-based"
 	select ARCH_HAS_HOLES_MEMORYMODEL
+	select ARCH_PATCH_PHYS_VIRT
 	select ARCH_REQUIRE_GPIOLIB
 	select ARCH_USES_GETTIMEOFFSET
 	select ARM_AMBA
 	select ARM_VIC
+	select AUTO_ZRELADDR
 	select CLKDEV_LOOKUP
 	select CPU_ARM920T
 	select NEED_MACH_MEMORY_H
-- 
1.7.10.4

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