linux-kernel - Re: [PATCH] arm64: dts: ti: k3-am64-main: Add SYSFW reserved ranges in OCRAM

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Date:   Fri, 11 Jun 2021 14:16:40 -0500
From:   Nishanth Menon <nm@...com>
To:     Vignesh Raghavendra <vigneshr@...com>
CC:     Rob Herring <robh+dt@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm64: dts: ti: k3-am64-main: Add SYSFW reserved ranges
 in OCRAM

On 19:36-20210609, Vignesh Raghavendra wrote:
> Last 256K of OCRAM (256K@...01c0000) is reserved for SYSFW usage. Hence
> add an entry in DT so that its not used for generic pool memory
> allocation.

Are you really sure?? I know that I had set a budget for 16K in sysfw
when I did the memory split up for sysfw of which 16k is actually used.

Not sure where this 256K bucket started off from.. am I missing
something here?


> 
> Without this certain drivers using SRAM as generic shared memory pool
> may end up being allocated memory from this range and will lead to boot
> time crash when the reserved range is accessed (due to firewall
> violation).
> 
> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
> ---
>  arch/arm64/boot/dts/ti/k3-am64-main.dtsi | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
> index f1c42ef05e52..77b88e536534 100644
> --- a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
> @@ -16,6 +16,10 @@ oc_sram: sram@...00000 {
>  		atf-sram@0 {
>  			reg = <0x0 0x1a000>;
>  		};
> +
> +		dmsc-sram@...000 {
> +			reg = <0x1c0000 0x40000>;

> +		};
>  	};
>  
>  	gic500: interrupt-controller@...0000 {
> -- 
> 2.31.1
> 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D