linux-kernel - Re: [PATCH v2] arm64: dts: ti: k3-am64-main: Update the location of ATF in SRAM and increase its max size

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Message-ID: <e53458a9-e5f6-6507-f95c-2406b47b5576@ti.com>
Date:   Wed, 9 Jun 2021 19:59:14 +0530
From:   Lokesh Vutla <lokeshvutla@...com>
To:     Aswath Govindraju <a-govindraju@...com>
CC:     Vignesh Raghavendra <vigneshr@...com>, Suman Anna <s-anna@...com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: ti: k3-am64-main: Update the location of
 ATF in SRAM and increase its max size



On 07/06/21 7:08 pm, Aswath Govindraju wrote:
> Due to a limitation for USB DFU boot mode, SPL load address has to be less
> than  or equal to 0x70001000. So, load address of SPL and ATF have been
> moved to 0x70000000 and 0x701a0000 respectively.
> 
> Also, the maximum size of ATF has been increased to 0x1c000 [1].
> 
> Therefore, update ATF's location and maximum size accordingly in the device
> tree file.
> 
> [1] - https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/commit/?id=2fb5312f61a7de8b7a70e1639199c4f14a10b6f9
> 
> Signed-off-by: Aswath Govindraju <a-govindraju@...com>
> ---
>  arch/arm64/boot/dts/ti/k3-am64-main.dtsi | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
> index ca59d1f711f8..fcd12b6f10f6 100644
> --- a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
> @@ -13,8 +13,8 @@
>  		#size-cells = <1>;
>  		ranges = <0x0 0x00 0x70000000 0x200000>;
>  
> -		atf-sram@0 {
> -			reg = <0x0 0x1a000>;
> +		atf-sram@...000 {
> +			reg = <0x1a0000 0x1c000>;

After thinking a bot more, isn't size be 0x20000?
ATF is allocated with 125KB no? no point keeping the ~3 as hole IMO.

Thanks and regards,
Lokesh

>  		};
>  	};
>  
>