linux-kernel - [PATCH 12/14] ARM: add CONFIG_PHYS

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Message-Id: <20210928154143.2106903-13-arnd@kernel.org>
Date:   Tue, 28 Sep 2021 17:41:41 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Russell King <linux@...linux.org.uk>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        llvm@...ts.linux.dev, Nicolas Pitre <nico@...aro.org>
Subject: [PATCH 12/14] ARM: add CONFIG_PHYS_OFFSET default values

From: Arnd Bergmann <arnd@...db.de>

For platforms that are not yet converted to ARCH_MULTIPLATFORM,
we can disable CONFIG_ARM_PATCH_PHYS_VIRT, which in turn requires
setting a correct address here.

As we actualy know what all the values are supposed to be based
on the old mach/memory.h header file contents (from git history),
we can just add them here.

This also solves a problem in Kconfig where 'make randconfig'
fails to continue if no number is selected for a 'hex' option.
Users can still override the number at configuration time, e.g.
when the memory visible to the kernel starts at a nonstandard
address on some machine, but it should no longer be required
now.

I originally posted this back in 2016, but the problem still
persists. The patch has gotten much simpler though, as almost
all platforms rely on ARM_PATCH_PHYS_VIRT now.

Acked-by: Nicolas Pitre <nico@...aro.org>
Link: https://lore.kernel.org/linux-arm-kernel/1455804123-2526139-5-git-send-email-arnd@arndb.de/
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/arm/Kconfig | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 12a0bd4b315d..0d4f3e2d50ad 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -264,10 +264,12 @@ config PHYS_OFFSET
 	hex "Physical address of main memory" if MMU
 	depends on !ARM_PATCH_PHYS_VIRT
 	default DRAM_BASE if !MMU
-	default 0x00000000 if ARCH_FOOTBRIDGE
+	default 0x00000000 if ARCH_FOOTBRIDGE || ARCH_IXP4XX
 	default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
-	default 0x20000000 if ARCH_S5PV210
-	default 0xc0000000 if ARCH_SA1100
+	default 0x30000000 if ARCH_S3C24XX
+	default 0xa0000000 if ARCH_IOP32X || ARCH_PXA
+	default 0xc0000000 if ARCH_EP93XX || ARCH_SA1100
+	default 0
 	help
 	  Please provide the physical address corresponding to the
 	  location of main memory in your system.
-- 
2.29.2