linux-kernel - Re: [PATCH 1/1] ARM64: dts: meson-gxbb-odroidc2: linux,usable-memory

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Date:   Fri, 23 Dec 2016 20:48:42 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Heinrich Schuchardt <xypron.glpk@....de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Carlo Caione <carlo@...one.org>,
        Kevin Hilman <khilman@...libre.com>
CC:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ARM64: dts: meson-gxbb-odroidc2: linux,usable-memory

Le 23/12/2016 13:52, Heinrich Schuchardt a écrit :
> After reading the fdt u-boot overwrites the reg property of the
> memory node with <0x0 0x0 0x0 0x78000000>.
> 
> To override this setting we have to use the property
> linux,usable-memory.
> 
> If the first 16MB of the 2GB physical memory are used by
> the Linux kernel oops occur on the Odroid C2.
> 
> For the Odroid C2 this patch replaces
> [RFT PATCH] ARM64: dts: meson-gxbb: Add reserved memory zone and
> usable memory range
> https://lkml.org/lkml/2016/12/12/127
> 
> Fixes: 855960342d1e7 ARM64: dts: amlogic: add Hardkernel ODROID-C2
> CC: Neil Armstrong <narmstrong@...libre.com>
> CC: Kevin Hilman <khilman@...libre.com>
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
> ---
>  arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
> index 238fbeacd330..82ab94417940 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
> @@ -61,7 +61,7 @@
>  
>  	memory@0 {
>  		device_type = "memory";
> -		reg = <0x0 0x0 0x0 0x80000000>;
> +		linux,usable-memory = <0x0 0x01000000 0x0 0x7f000000>;
>  	};
>  
>  	usb_otg_pwr: regulator-usb-pwrs {
> 

Hi Heinrich,

Thanks a lot for testing and pushing this patch, indeed I missed this point abou u-boot overwriting reg.

I will test this next week, and hopefully get these merged.
Neil