[PATCH v3 0/2] Add ASRock Rack B650D4U BMC

[PATCH v3 0/2] Add ASRock Rack B650D4U BMC

[Prasanth Kumar Padarthi]

Add initial devicetree support for the ASRock Rack B650D4U BMC,
an ASPEED AST2600-based server management controller.

Changes in v3:
- Reorder board DTS nodes alphabetically by label.
- Clarify that the management LAN PHY is an on-board discrete PHY.
- Keep MAC0 phy-mode as "rgmii-rxid" based on the extracted vendor DTB.
- Keep flash layout unspecified until it can be validated on hardware.

Changes in v2:
- Add MAC0 dedicated management LAN description with MDIO PHY at address 0.

Prasanth Kumar Padarthi (2):
  dt-bindings: arm: aspeed: Add ASRock Rack B650D4U
  ARM: dts: aspeed: Add ASRock Rack B650D4U BMC

 .../bindings/arm/aspeed/aspeed.yaml           |  1 +
 arch/arm/boot/dts/aspeed/Makefile             |  1 +
 .../dts/aspeed/aspeed-bmc-asrock-b650d4u.dts  | 71 +++++++++++++++++++
 3 files changed, 73 insertions(+)
 create mode 100644 arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts

-- 
2.47.3

[PATCH v3 1/2] dt-bindings: arm: aspeed: Add ASRock Rack B650D4U

[Prasanth Kumar Padarthi]

Add the compatible string for the ASRock Rack B650D4U BMC,
which is an AST2600-based server motherboard.

Signed-off-by: Prasanth Kumar Padarthi <prasanth.padarthi10@gmail.com>
---
 Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml b/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml
index 2f92b8ab0..656397850 100644
--- a/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml
+++ b/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml
@@ -77,6 +77,7 @@ properties:
               - ampere,mtmitchell-bmc
               - aspeed,ast2600-evb
               - aspeed,ast2600-evb-a1
+              - asrock,b650d4u-bmc
               - asus,x4tf-bmc
               - facebook,bletchley-bmc
               - facebook,catalina-bmc
-- 
2.47.3

Re: [PATCH v3 1/2] dt-bindings: arm: aspeed: Add ASRock Rack B650D4U

[Krzysztof Kozlowski]

On Mon, May 18, 2026 at 09:04:39AM +0530, Prasanth Kumar Padarthi wrote:
> Add the compatible string for the ASRock Rack B650D4U BMC,
> which is an AST2600-based server motherboard.
> 
> Signed-off-by: Prasanth Kumar Padarthi <prasanth.padarthi10@gmail.com>
> ---

<form letter>
This is a friendly reminder during the review process.

It looks like you received a tag and forgot to add it.

If you do not know the process, here is a short explanation:
Please add Acked-by/Reviewed-by/Tested-by tags when posting new
versions of patchset, under or above your Signed-off-by tag, unless
patch changed significantly (e.g. new properties added to the DT
bindings). Tag is "received", when provided in a message replied to you
on the mailing list. Tools like b4 can help here. However, there's no
need to repost patches *only* to add the tags. The upstream maintainer
will do that for tags received on the version they apply.

Please read:
https://elixir.bootlin.com/linux/v6.12-rc3/source/Documentation/process/submitting-patches.rst#L577

If a tag was not added on purpose, please state in the patch changelog
or cover letter why and what changed.
</form letter>

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof

[PATCH v3 2/2] ARM: dts: aspeed: Add ASRock Rack B650D4U BMC

[Prasanth Kumar Padarthi]

Add initial device tree support for the ASRock Rack B650D4U BMC.
The B650D4U is a server motherboard utilizing the ASPEED AST2600
SoC for management.

Signed-off-by: Prasanth Kumar Padarthi <prasanth.padarthi10@gmail.com>
---
 arch/arm/boot/dts/aspeed/Makefile             |  1 +
 .../dts/aspeed/aspeed-bmc-asrock-b650d4u.dts  | 71 +++++++++++++++++++
 2 files changed, 72 insertions(+)
 create mode 100644 arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts

diff --git a/arch/arm/boot/dts/aspeed/Makefile b/arch/arm/boot/dts/aspeed/Makefile
index c4f064e4b..124d4f8f8 100644
--- a/arch/arm/boot/dts/aspeed/Makefile
+++ b/arch/arm/boot/dts/aspeed/Makefile
@@ -13,6 +13,7 @@ dtb-$(CONFIG_ARCH_ASPEED) += \
 	aspeed-bmc-asrock-romed8hm3.dtb \
 	aspeed-bmc-asrock-spc621d8hm3.dtb \
 	aspeed-bmc-asrock-x570d4u.dtb \
+	aspeed-bmc-asrock-b650d4u.dtb \
 	aspeed-bmc-asus-x4tf.dtb \
 	aspeed-bmc-bytedance-g220a.dtb \
 	aspeed-bmc-delta-ahe50dc.dtb \
diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts
new file mode 100644
index 000000000..daa8b25e3
--- /dev/null
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "aspeed-g6.dtsi"
+
+/ {
+	model = "ASRock Rack B650D4U BMC";
+	compatible = "asrock,b650d4u-bmc", "aspeed,ast2600";
+
+	aliases {
+		serial4 = &uart5;
+	};
+
+	chosen {
+		stdout-path = "serial4:115200n8";
+	};
+
+	memory@80000000 {
+		device_type = "memory";
+		reg = <0x80000000 0x40000000>;
+	};
+};
+
+/* SPI Flash Management */
+&fmc {
+	status = "okay";
+	flash@0 {
+		status = "okay";
+		m25p,fast-read;
+		label = "bmc";
+	};
+};
+
+/* I2C Bus for FRU/EEPROM Storage */
+&i2c7 {
+	status = "okay";
+	eeprom@57 {
+		compatible = "atmel,24c02";
+		reg = <0x57>;
+		pagesize = <16>;
+	};
+};
+
+&mac0 {
+	status = "okay";
+	phy-mode = "rgmii-rxid";
+	phy-handle = <&ethphy0>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_rgmii1_default &pinctrl_mdio1_default>;
+};
+
+/* Dedicated management LAN via on-board discrete PHY */
+&mdio0 {
+	status = "okay";
+
+	ethphy0: ethernet-phy@0 {
+		compatible = "ethernet-phy-ieee802.3-c22";
+		reg = <0>;
+	};
+};
+
+/* BMC Console UART */
+&uart5 {
+	status = "okay";
+};
+
+/* System Watchdog */
+&wdt1 {
+	status = "okay";
+	aspeed,reset-type = "soc";
+};
-- 
2.47.3

Re: [PATCH v3 2/2] ARM: dts: aspeed: Add ASRock Rack B650D4U BMC

[Andrew Lunn]

> +&mac0 {
> +	status = "okay";
> +	phy-mode = "rgmii-rxid";

It does not matter if this is what the vendor does, it is still wrong,
unless you can show the PCB is adding the delay.

   Andrew

Re: [PATCH v3 2/2] ARM: dts: aspeed: Add ASRock Rack B650D4U BMC

[Prasanth]

Hi Andrew,

Understood. I will not rely only on the vendor DTB value for this.

For the next revision, I will drop rgmii-rxid and use the conservative
rgmii setting unless I can provide board-level evidence that the
required RGMII delay is added by the PCB/PHY configuration.

I am arranging hardware validation for this board, and I will update
the Ethernet node only with evidence from the board/manual/logs.

Thanks,
Prasanth



On Mon, May 18, 2026 at 5:42 PM Andrew Lunn <andrew@lunn.ch> wrote:
>
> > +&mac0 {
> > +     status = "okay";
> > +     phy-mode = "rgmii-rxid";
>
> It does not matter if this is what the vendor does, it is still wrong,
> unless you can show the PCB is adding the delay.
>
>    Andrew