linux-kernel - Re: [PATCH v15 4/7] arm64: dts: imx8ulp-evk: add reserved memory property

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Message-ID: <Z/QiWLiX010ghlLR@lizhi-Precision-Tower-5810>
Date: Mon, 7 Apr 2025 15:07:04 -0400
From: Frank Li <Frank.li@....com>
To: Pankaj Gupta <pankaj.gupta@....com>
Cc: Jonathan Corbet <corbet@....net>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v15 4/7] arm64: dts: imx8ulp-evk: add reserved memory
 property

On Mon, Apr 07, 2025 at 09:50:20PM +0530, Pankaj Gupta wrote:
> Reserve 1MB of DDR memory region due to EdgeLock Enclave's hardware
> limitation restricting access to DDR addresses from 0x80000000
> to 0xafffffff.
>
> Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
> ---

Reviewed-by: Frank Li <Frank.Li@....com>

>  arch/arm64/boot/dts/freescale/imx8ulp-evk.dts | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts b/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
> index 290a49bea2f7..10aaf02f8ea7 100644
> --- a/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
> @@ -1,6 +1,6 @@
>  // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>  /*
> - * Copyright 2021 NXP
> + * Copyright 2021, 2025 NXP
>   */
>
>  /dts-v1/;
> @@ -37,6 +37,12 @@ linux,cma {
>  			linux,cma-default;
>  		};
>
> +		ele_reserved: memory@...00000 {
> +			compatible = "shared-dma-pool";
> +			reg = <0 0x90000000 0 0x100000>;
> +			no-map;
> +		};
> +
>  		m33_reserved: noncacheable-section@...00000 {
>  			reg = <0 0xa8600000 0 0x1000000>;
>  			no-map;
> @@ -259,6 +265,10 @@ &usdhc0 {
>  	status = "okay";
>  };
>
> +&hsm0 {
> +	memory-region = <&ele_reserved>;
> +};
> +
>  &fec {
>  	pinctrl-names = "default", "sleep";
>  	pinctrl-0 = <&pinctrl_enet>;
>
> --
> 2.43.0
>