Re: [PATCH v2 3/3] arm64: dts: qcom: Add Microsoft Surface Laptop 8th Edition

[Konrad Dybcio]

On 10/27/26 8:33 AM, Gopikrishna Garmidi wrote:
> Add support for the Microsoft Surface Laptop 13.8" 8th Edition, which is
> built on the Mahua SoC. Most of the board follows the Qualcomm reference
> design. The keyboard, fan and platform profile sit behind the Surface
> Aggregator Module on uart22, same as on the Surface Laptop 7.

[...]


> +		serial0 = &uart22;
> +		serial1 = &uart14;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};

This sends console output straight into your EC, either enable the
debug UART and point it there or remove this hunk

[...]

> +	reserved-memory {
> +		linux,cma {
> +			compatible = "shared-dma-pool";
> +			size = <0x0 0x8000000>;
> +			reusable;
> +			linux,cma-default;
> +		};
> +	};

This hunk should not be necessary, it was on Hamoa laptops because we
didn't have control over the PCIe SMMU and needed a CMA space

Konrad