linux-kernel - Re: [PATCH 7/8] arm64: dts: allwinner: Add Allwinner H616 .dtsi file

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Date:   Wed, 2 Dec 2020 21:16:49 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Andre Przywara <andre.przywara@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>
Cc:     devicetree@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        Rob Herring <robh+dt@...nel.org>,
        Icenowy Zheng <icenowy@...c.xyz>,
        Yangtao Li <frank@...winnertech.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 7/8] arm64: dts: allwinner: Add Allwinner H616 .dtsi file

Andre,

On 12/2/20 7:54 AM, Andre Przywara wrote:
...
> +	soc {
> +		compatible = "simple-bus";
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges = <0x0 0x0 0x0 0x40000000>;
> +
> +		syscon: syscon@...0000 {
> +			compatible = "allwinner,sun50i-h616-system-control",
> +				     "allwinner,sun50i-a64-system-control";
> +			reg = <0x03000000 0x1000>;
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges;
> +
> +			sram_c: sram@...00 {
> +				compatible = "mmio-sram";
> +				reg = <0x00028000 0x30000>;
> +				#address-cells = <1>;
> +				#size-cells = <1>;
> +				ranges = <0 0x00028000 0x30000>;
> +			};
> +
> +			sram_c1: sram@...0000 {
> +				compatible = "mmio-sram";
> +				reg = <0x01a00000 0x200000>;
> +				#address-cells = <1>;
> +				#size-cells = <1>;
> +				ranges = <0 0x01a00000 0x200000>;
> +
> +				ve_sram: sram-section@0 {
> +					compatible = "allwinner,sun50i-h616-sram-c1",
> +						     "allwinner,sun4i-a10-sram-c1";
> +					reg = <0x000000 0x200000>;
> +				};
> +			};
> +		};

You mentioned that you could not find a SRAM A2. How were these SRAM ranges
verified? If you can load eGON.BT0 larger than 32 KiB, then presumably NBROM
uses SRAM C, and it is in the manual, but I see no mention of SRAM C1.

Cheers,
Samuel