linux-kernel - Re: [PATCH 8/8] riscv: dts: spacemit: add SpacemiT K3 Pico-ITX board device tree

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Message-ID: <3c38ce9c-4259-4149-bf2c-a54e74c00a34@canonical.com>
Date: Tue, 16 Dec 2025 15:33:30 +0100
From: Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
To: Guodong Xu <guodong@...cstar.com>
Cc: Paul Walmsley <paul.walmsley@...ive.com>,
 Palmer Dabbelt <palmer@...ive.com>, Conor Dooley <conor@...nel.org>,
 Heinrich Schuchardt <xypron.glpk@....de>,
 Kevin Meng Zhang <zhangmeng.kevin@...ux.spacemit.com>,
 devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
 linux-kernel@...r.kernel.org, spacemit@...ts.linux.dev,
 linux-serial@...r.kernel.org, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Paul Walmsley <pjw@...nel.org>,
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Alexandre Ghiti <alex@...ti.fr>, Yixun Lan <dlan@...too.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Thomas Gleixner <tglx@...utronix.de>,
 Samuel Holland <samuel.holland@...ive.com>, Anup Patel
 <anup@...infault.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jiri Slaby <jirislaby@...nel.org>, Lubomir Rintel <lkundrak@...sk>,
 Yangyu Chen <cyy@...self.name>
Subject: Re: [PATCH 8/8] riscv: dts: spacemit: add SpacemiT K3 Pico-ITX board
 device tree

On 12/16/25 14:32, Guodong Xu wrote:
> K3 Pico-ITX is a 2.5-inch single-board computer equipted with a SpacemiT
> K3 SoC.
> 
> This minimal device tree enables booting into a serial console with UART
> output.
> 
> Signed-off-by: Guodong Xu <guodong@...cstar.com>
> ---
>   arch/riscv/boot/dts/spacemit/Makefile        |  1 +
>   arch/riscv/boot/dts/spacemit/k3-pico-itx.dts | 25 +++++++++++++++++++++++++
>   2 files changed, 26 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/spacemit/Makefile b/arch/riscv/boot/dts/spacemit/Makefile
> index 95889e7269d1bae679b28cd053e1b0a23ae6de68..7e2b877025718113a0e31917eadf7562f488d825 100644
> --- a/arch/riscv/boot/dts/spacemit/Makefile
> +++ b/arch/riscv/boot/dts/spacemit/Makefile
> @@ -4,3 +4,4 @@ dtb-$(CONFIG_ARCH_SPACEMIT) += k1-milkv-jupiter.dtb
>   dtb-$(CONFIG_ARCH_SPACEMIT) += k1-musepi-pro.dtb
>   dtb-$(CONFIG_ARCH_SPACEMIT) += k1-orangepi-r2s.dtb
>   dtb-$(CONFIG_ARCH_SPACEMIT) += k1-orangepi-rv2.dtb
> +dtb-$(CONFIG_ARCH_SPACEMIT) += k3-pico-itx.dtb
> diff --git a/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
> new file mode 100644
> index 0000000000000000000000000000000000000000..0f9d04dd352f5331e82599285113b86af5b09ebe
> --- /dev/null
> +++ b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
> @@ -0,0 +1,25 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Copyright (c) 2025 SpacemiT (Hangzhou) Technology Co. Ltd
> + * Copyright (c) 2025 Guodong Xu <guodong@...cstar.com>
> + */
> +
> +#include "k3.dtsi"
> +
> +/ {
> +	model = "SpacemiT K3 Pico-ITX";
> +	compatible = "spacemit,k3-pico-itx", "spacemit,k3";
> +
> +	chosen {
> +		stdout-path = "serial0";
> +	};
> +
> +	memory@...200000 {
> +		device_type = "memory";
> +		reg = <0x1 0x00200000 0x3 0xffe00000>;

Shouldn't the reserved memory be described as no-map /reserved-memory 
nodes instead?

I would assume that 0x1,0000,0000 is the location of OpenSBI.
What is at 0x3,ffe0,0000?

Best regards

Heinrich

> +	};
> +};
> +
> +&uart0 {
> +	status = "okay";
> +};
>