Re: [PATCH v4 6/7] arm64: dts: allwinner: a100: reserve RAM for ATF

["Jernej Škrabec" <jernej.skrabec@gmail.com>]

Dne petek, 5. junij 2026 ob 09:09:20 Srednjeevropski poletni čas je Alexander Sverdlin napisal(a):
> Add reserved-memory node carving out Trusted Firmware-A region spanning
> fixed 256K from physical address 0x40000000. Even though Allwinner ATF
> itself passes the address range in the fdt to U-Boot, U-Boot currently
> only reserves this memory internally, but doesn't carve out the region
> in the fdt passed to Linux.
> 
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>

NAK. It is job of boot procedure to properly inject TF-A reserved node.
Any issue should be fixed there.

Best regards,
Jernej Skrabec

> ---
> Changelog:
> v4:
> - new patch
> 
>  arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> index 7cb06b19b5a5..d8391663fd1d 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> @@ -87,6 +87,22 @@ osc32k: osc32k-clk {
>  		#clock-cells = <0>;
>  	};
>  
> +	reserved-memory {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		/*
> +		 * 256 KiB reserved for Trusted Firmware-A (BL31).
> +		 * This is added by BL31 itself, but some bootloaders fail
> +		 * to propagate this into the DTB handed to kernels.
> +		 */
> +		secmon@40000000 {
> +			reg = <0x0 0x40000000 0x0 0x40000>;
> +			no-map;
> +		};
> +	};
> +
>  	timer {
>  		compatible = "arm,armv8-timer";
>  		interrupts = <GIC_PPI 13
>