linux-kernel - Re: [PATCH v4 6/9] arm64: dts : ti: k3-am68-sk-som: Add DDR carveout memory nodes for R5F

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Date:   Wed, 27 Sep 2023 20:51:02 +0530
From:   "Kumar, Udit" <u-kumar1@...com>
To:     Apurva Nandan <a-nandan@...com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Hari Nagalla <hnagalla@...com>
Subject: Re: [PATCH v4 6/9] arm64: dts : ti: k3-am68-sk-som: Add DDR carveout
 memory nodes for R5F


On 9/6/2023 4:54 PM, Apurva Nandan wrote:
> Two carveout reserved memory nodes each have been added for each of the
> R5F remote processor device within both the MCU and MAIN domains for the
> TI K3 AM68 SK boards. These nodes are assigned to the respective rproc
> device nodes as well. The first region will be used as the DMA pool for
> the rproc device, and the second region will furnish the static carveout
> regions for the firmware memory.
>
> The current carveout addresses and sizes are defined statically for each
> device. The R5F processors do not have an MMU, and as such require the
> exact memory used by the firmwares to be set-aside. The firmware images
> do not require any RSC_CARVEOUT entries in their resource tables either
> to allocate the memory for firmware memory segments.
>
> Note that the R5F1 carveouts are needed only if the R5F cluster is
> running in Split (non-LockStep) mode. The reserved memory nodes can be
> disabled later on if there is no use-case defined to use the
> corresponding
> remote processor.
>
> Signed-off-by: Sinthu Raja <sinthu.raja@...com>
> Signed-off-by: Apurva Nandan <a-nandan@...com>
> ---
>   arch/arm64/boot/dts/ti/k3-am68-sk-som.dtsi | 156 +++++++++++++++++++++
>   1 file changed, 156 insertions(+)

Reviewed by: Udit Kumar<u-kumar1@...com>

> [...]