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AJvYcCWNEoCJB0BYO5cKaFi7BvsEvKAkRQ2TkDIEVZdV8ACwx66W+CnfJPKyhJ1i/1qkZJkof72Atyvfjfcf@vger.kernel.org X-Gm-Message-State: AOJu0Yx8ee8LPPSBFJmSgfRcDs8F6cOXlZi8NTtnmmEJoI+Tvj5r/ZaO TMCoNLAgIpCDzfKIv6RTyxpQu+sWAbm72D/PNyJ6/4lE45ZOkPOFuKJ29ckjjDHlscjRYEBZE+s 3GXdWKgCO47aFa8YIDySZR8V//CpeWH5yxP1zSyomLQ== X-Gm-Gg: AY/fxX7ZA5Jiw1ac1Gv8X3a9ZcT42UeOexry6V2uzOQr9k1lAkch4jW+oJb19tnd+eH 5cBl0i1SD/ngOnrNuczILgDsKK8WTv31Hg+3TkaIsxfV3KvF8LHZSpvLVbFakQVD9/4VJPeathK KG8HSnl+poj+TyHqTSt918yC6XPUXxTv8r0JI0fEycZrGv0ej7ASw2/nSD/Rjdqh+sR17CG45Gt JVuvstW0Cso5WkLhCtwAE4oSYwfdtVlQxSaq39aEYFNmyvfEcUVsU55O1oseNmd2q8dwNVDuNPX hReotqkzo1zbkZX27bFi7Wido0WxQS1M+3RuJxO3TxtOAvju9hbD7cQ= X-Google-Smtp-Source: AGHT+IH0USc98adq68YuNkR6BO6s7ouNVB7SxQasWdlzVDiV6ZxglCL/bAho39AyjZN16MBGjdgmEImzF7UM0hhyf0g= X-Received: by 2002:a05:690c:6a0e:b0:78a:7a68:e4fe with SMTP id 00721157ae682-78e6831c4dbmr123317137b3.25.1765955641406; Tue, 16 Dec 2025 23:14:01 -0800 (PST) Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20251216-k3-basic-dt-v1-0-a0d256c9dc92@riscstar.com> <20251216-k3-basic-dt-v1-8-a0d256c9dc92@riscstar.com> <3c38ce9c-4259-4149-bf2c-a54e74c00a34@canonical.com> In-Reply-To: <3c38ce9c-4259-4149-bf2c-a54e74c00a34@canonical.com> From: Guodong Xu Date: Wed, 17 Dec 2025 15:13:50 +0800 X-Gm-Features: AQt7F2qt3rSNkF23w_AVCZL60KRRfHKfFoZFSmyzaNBRd3Kb1iOnGUyhNAVCUBk Message-ID: Subject: Re: [PATCH 8/8] riscv: dts: spacemit: add SpacemiT K3 Pico-ITX board device tree To: Heinrich Schuchardt Cc: Paul Walmsley , Conor Dooley , Heinrich Schuchardt , Kevin Meng Zhang , devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, spacemit@lists.linux.dev, linux-serial@vger.kernel.org, Rob Herring , Krzysztof Kozlowski , Conor Dooley , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Yixun Lan , Daniel Lezcano , Thomas Gleixner , Samuel Holland , Anup Patel , Greg Kroah-Hartman , Jiri Slaby , Lubomir Rintel , Yangyu Chen Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, Dec 16, 2025 at 10:33=E2=80=AFPM Heinrich Schuchardt wrote: > > On 12/16/25 14:32, Guodong Xu wrote: > > K3 Pico-ITX is a 2.5-inch single-board computer equipted with a Spacemi= T > > K3 SoC. > > > > This minimal device tree enables booting into a serial console with UAR= T > > output. > > > > Signed-off-by: Guodong Xu > > --- > > 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/dt= s/spacemit/Makefile > > index 95889e7269d1bae679b28cd053e1b0a23ae6de68..7e2b877025718113a0e3191= 7eadf7562f488d825 100644 > > --- a/arch/riscv/boot/dts/spacemit/Makefile > > +++ b/arch/riscv/boot/dts/spacemit/Makefile > > @@ -4,3 +4,4 @@ dtb-$(CONFIG_ARCH_SPACEMIT) +=3D k1-milkv-jupiter.dtb > > dtb-$(CONFIG_ARCH_SPACEMIT) +=3D k1-musepi-pro.dtb > > dtb-$(CONFIG_ARCH_SPACEMIT) +=3D k1-orangepi-r2s.dtb > > dtb-$(CONFIG_ARCH_SPACEMIT) +=3D k1-orangepi-rv2.dtb > > +dtb-$(CONFIG_ARCH_SPACEMIT) +=3D 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..0f9d04dd352f5331e825992= 85113b86af5b09ebe > > --- /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 > > + */ > > + > > +#include "k3.dtsi" > > + > > +/ { > > + model =3D "SpacemiT K3 Pico-ITX"; > > + compatible =3D "spacemit,k3-pico-itx", "spacemit,k3"; > > + > > + chosen { > > + stdout-path =3D "serial0"; > > + }; > > + > > + memory@100200000 { > > + device_type =3D "memory"; > > + reg =3D <0x1 0x00200000 0x3 0xffe00000>; > > Shouldn't the reserved memory be described as no-map /reserved-memory > nodes instead? Hi Heinrich, Yes, you are right. Using a reserved-memory node with the no-map property i= s the correct approach. I will update this in the next version to explicitly reserve the first 2MB. > > I would assume that 0x1,0000,0000 is the location of OpenSBI. > What is at 0x3,ffe0,0000? Yes, confirmed, 0x100000000 is the start of OpenSBI. The size 0x3ffe00000 i= n my original patch was the result of manually subtracting the 2MB OpenSBI offset from the total 16GB memory. I will correct this in v2 to show the actual memory and put the first 2MB i= n reserved-memory {} for opensbi. Thanks for the review. BR, Guodong Xu > > Best regards > > Heinrich > > > + }; > > +}; > > + > > +&uart0 { > > + status =3D "okay"; > > +}; > > >