linux-kernel - Re: [PATCH] arm64: zynqmp: Add memory reserved node for k26 Kria SOM board

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Message-ID: <cdd0ba45-d3b0-3de9-0f84-486df799c6a5@amd.com>
Date:   Mon, 10 Jul 2023 12:06:33 +0200
From:   Michal Simek <michal.simek@....com>
To:     linux-kernel@...r.kernel.org, monstr@...str.eu,
        michal.simek@...inx.com, git@...inx.com
Cc:     Sharath Kumar Dasari <sharath.kumar.dasari@...inx.com>,
        Amit Kumar Mahapatra <amit.kumar-mahapatra@...inx.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Manikanta Guntupalli <manikanta.guntupalli@....com>,
        Parth Gajjar <parth.gajjar@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Srinivas Neeli <srinivas.neeli@...inx.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64: zynqmp: Add memory reserved node for k26 Kria SOM
 board



On 6/12/23 09:41, Michal Simek wrote:
> From: Sharath Kumar Dasari <sharath.kumar.dasari@...inx.com>
> 
> PMUFW (Power Management Unit firmware) requires top 1MB of the lower DDR
> memory reserved for its operation, this is missing in k26 SM static dts
> file. Bootloader or kernel shouldn't access this location.
> 
> Signed-off-by: Sharath Kumar Dasari <sharath.kumar.dasari@...inx.com>
> Signed-off-by: Michal Simek <michal.simek@....com>
> ---
> 
>   arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts | 11 +++++++++++
>   1 file changed, 11 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts b/arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts
> index c1f21b0e1760..c4774a42d5fc 100644
> --- a/arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts
> +++ b/arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts
> @@ -50,6 +50,17 @@ memory@0 {
>   		reg = <0x0 0x0 0x0 0x80000000>, <0x8 0x00000000 0x0 0x80000000>;
>   	};
>   
> +	reserved-memory {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		pmu_region: pmu@...00000 {
> +			reg = <0x0 0x7ff00000 0x0 0x100000>;
> +			no-map;
> +		};
> +	};
> +
>   	gpio-keys {
>   		compatible = "gpio-keys";
>   		autorepeat;

Applied.
M