linux-kernel - Re: [PATCH 12/14] ARM: add CONFIG_PHYS_OFFSET default values

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Date:   Tue, 28 Sep 2021 12:02:53 -0400 (EDT)
From:   Nicolas Pitre <nico@...xnic.net>
To:     Arnd Bergmann <arnd@...nel.org>
cc:     Russell King <linux@...linux.org.uk>,
        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
Subject: Re: [PATCH 12/14] ARM: add CONFIG_PHYS_OFFSET default values

On Tue, 28 Sep 2021, Arnd Bergmann wrote:

> 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>

Acked-by: Nicolas Pitre <nico@...xnic.net>

> 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
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

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