riscv: dts: spacemit: Add initial support for MusePi Pro

[PATCH 2/2] riscv: dts: spacemit: Add MusePi Pro board device tree

Posted by Troy Mitchell 4 months, 2 weeks ago

From: Troy Mitchell <troy.mitchell@linux.spacemit.com>

Add initial device tree support for the MusePi Pro board [1].
The board is using the SpacemiT K1/M1 SoC.

The device tree is adapted from the SpacemiT vendor tree [2].

This minimal device tree enables booting into a serial console with UART
output and a blinking LED.

Link:
https://developer.spacemit.com/documentation?token=YJtdwnvvViPVcmkoPDpcvwfVnrh&type=pdf [1]
https://gitee.com/bianbu-linux/linux-6.6/blob/k1-bl-v2.2.y/arch/riscv/boot/dts/spacemit/k1-x_MUSE-Pi-Pro.dts [2]

Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
---
 arch/riscv/boot/dts/spacemit/Makefile          |  1 +
 arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts | 40 ++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/arch/riscv/boot/dts/spacemit/Makefile b/arch/riscv/boot/dts/spacemit/Makefile
index 152832644870624d8fd77684ef33addb42b0baf3..76b98096e2a46c3192651d6d66af7742f740c635 100644
--- a/arch/riscv/boot/dts/spacemit/Makefile
+++ b/arch/riscv/boot/dts/spacemit/Makefile
@@ -2,3 +2,4 @@
 dtb-$(CONFIG_ARCH_SPACEMIT) += k1-bananapi-f3.dtb
 dtb-$(CONFIG_ARCH_SPACEMIT) += k1-milkv-jupiter.dtb
 dtb-$(CONFIG_ARCH_SPACEMIT) += k1-orangepi-rv2.dtb
+dtb-$(CONFIG_ARCH_SPACEMIT) += k1-musepi-pro.dtb
diff --git a/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
new file mode 100644
index 0000000000000000000000000000000000000000..3791186ce47b88887eab4321dcd7035668e7f02d
--- /dev/null
+++ b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright (C) 2024 Yangyu Chen <cyy@cyyself.name>
+ * Copyright (C) 2025 Troy Mitchell <troy.mitchell@linux.spacemit.com>
+ */
+
+/dts-v1/;
+
+#include "k1.dtsi"
+#include "k1-pinctrl.dtsi"
+
+/ {
+	model = "MusePi Pro";
+	compatible = "spacemit,musepi-pro", "spacemit,k1";
+
+	aliases {
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0";
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led1 {
+			label = "sys-led";
+			gpios = <&gpio K1_GPIO(96) GPIO_ACTIVE_HIGH>;
+			linux,default-trigger = "heartbeat";
+			default-state = "on";
+		};
+	};
+};
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_2_cfg>;
+	status = "okay";
+};

-- 
2.51.0

Re: [PATCH 2/2] riscv: dts: spacemit: Add MusePi Pro board device tree

Posted by Yixun Lan 4 months, 2 weeks ago

Hi Troy,

On 12:16 Sun 28 Sep     , Troy Mitchell wrote:
> From: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> 
> Add initial device tree support for the MusePi Pro board [1].
> The board is using the SpacemiT K1/M1 SoC.
> 
> The device tree is adapted from the SpacemiT vendor tree [2].
> 
> This minimal device tree enables booting into a serial console with UART
> output and a blinking LED.
> 
> Link:
> https://developer.spacemit.com/documentation?token=YJtdwnvvViPVcmkoPDpcvwfVnrh&type=pdf [1]
> https://gitee.com/bianbu-linux/linux-6.6/blob/k1-bl-v2.2.y/arch/riscv/boot/dts/spacemit/k1-x_MUSE-Pi-Pro.dts [2]
> 
same as patch 1
> Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> ---
>  arch/riscv/boot/dts/spacemit/Makefile          |  1 +
>  arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts | 40 ++++++++++++++++++++++++++
>  2 files changed, 41 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/spacemit/Makefile b/arch/riscv/boot/dts/spacemit/Makefile
> index 152832644870624d8fd77684ef33addb42b0baf3..76b98096e2a46c3192651d6d66af7742f740c635 100644
> --- a/arch/riscv/boot/dts/spacemit/Makefile
> +++ b/arch/riscv/boot/dts/spacemit/Makefile
> @@ -2,3 +2,4 @@
>  dtb-$(CONFIG_ARCH_SPACEMIT) += k1-bananapi-f3.dtb
>  dtb-$(CONFIG_ARCH_SPACEMIT) += k1-milkv-jupiter.dtb
>  dtb-$(CONFIG_ARCH_SPACEMIT) += k1-orangepi-rv2.dtb
> +dtb-$(CONFIG_ARCH_SPACEMIT) += k1-musepi-pro.dtb
please sort

> diff --git a/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
> new file mode 100644
> index 0000000000000000000000000000000000000000..3791186ce47b88887eab4321dcd7035668e7f02d
> --- /dev/null
> +++ b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
> @@ -0,0 +1,40 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Copyright (C) 2024 Yangyu Chen <cyy@cyyself.name>
> + * Copyright (C) 2025 Troy Mitchell <troy.mitchell@linux.spacemit.com>
> + */
> +
> +/dts-v1/;
> +
> +#include "k1.dtsi"
> +#include "k1-pinctrl.dtsi"
> +
> +/ {
> +	model = "MusePi Pro";
this is a little bit short, how about make it "SpacemiT MusePi Pro"?

> +	compatible = "spacemit,musepi-pro", "spacemit,k1";
> +
> +	aliases {
> +		serial0 = &uart0;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0";
> +	};
> +
> +	leds {
> +		compatible = "gpio-leds";
> +
> +		led1 {
> +			label = "sys-led";
> +			gpios = <&gpio K1_GPIO(96) GPIO_ACTIVE_HIGH>;
> +			linux,default-trigger = "heartbeat";
> +			default-state = "on";
> +		};
> +	};
> +};
> +
> +&uart0 {
..
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&uart0_2_cfg>;
swap these two lines, for similar reason, see my comment here
https://lore.kernel.org/all/20250918133209-GYB1273705@gentoo.org/

> +	status = "okay";
> +};
> 
> -- 
> 2.51.0
> 

while you are here, I'd suggest to push as many features as possible
instead of this minimal DT, which say - PMU, emmc, ethernet should be ready..
(ethernet is in next, should show up at v6.18-rc1)

-- 
Yixun Lan (dlan)

Re: [PATCH 2/2] riscv: dts: spacemit: Add MusePi Pro board device tree

Posted by Troy Mitchell 4 months, 2 weeks ago

On Sun, Sep 28, 2025 at 04:00:03PM +0800, Yixun Lan wrote:
> Hi Troy,
> 
> On 12:16 Sun 28 Sep     , Troy Mitchell wrote:
> > From: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> > 
> > Add initial device tree support for the MusePi Pro board [1].
> > The board is using the SpacemiT K1/M1 SoC.
> > 
> > The device tree is adapted from the SpacemiT vendor tree [2].
> > 
> > This minimal device tree enables booting into a serial console with UART
> > output and a blinking LED.
> > 
> > Link:
> > https://developer.spacemit.com/documentation?token=YJtdwnvvViPVcmkoPDpcvwfVnrh&type=pdf [1]
> > https://gitee.com/bianbu-linux/linux-6.6/blob/k1-bl-v2.2.y/arch/riscv/boot/dts/spacemit/k1-x_MUSE-Pi-Pro.dts [2]
> > 
> same as patch 1
> > Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> > ---
> >  arch/riscv/boot/dts/spacemit/Makefile          |  1 +
> >  arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts | 40 ++++++++++++++++++++++++++
> >  2 files changed, 41 insertions(+)
> > 
> > diff --git a/arch/riscv/boot/dts/spacemit/Makefile b/arch/riscv/boot/dts/spacemit/Makefile
> > index 152832644870624d8fd77684ef33addb42b0baf3..76b98096e2a46c3192651d6d66af7742f740c635 100644
> > --- a/arch/riscv/boot/dts/spacemit/Makefile
> > +++ b/arch/riscv/boot/dts/spacemit/Makefile
> > @@ -2,3 +2,4 @@
> >  dtb-$(CONFIG_ARCH_SPACEMIT) += k1-bananapi-f3.dtb
> >  dtb-$(CONFIG_ARCH_SPACEMIT) += k1-milkv-jupiter.dtb
> >  dtb-$(CONFIG_ARCH_SPACEMIT) += k1-orangepi-rv2.dtb
> > +dtb-$(CONFIG_ARCH_SPACEMIT) += k1-musepi-pro.dtb
> please sort
Oh my gosh..
That's my mistake. I will fix it in the next version.

> 
> > diff --git a/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..3791186ce47b88887eab4321dcd7035668e7f02d
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
> > @@ -0,0 +1,40 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +/*
> > + * Copyright (C) 2024 Yangyu Chen <cyy@cyyself.name>
> > + * Copyright (C) 2025 Troy Mitchell <troy.mitchell@linux.spacemit.com>
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include "k1.dtsi"
> > +#include "k1-pinctrl.dtsi"
> > +
> > +/ {
> > +	model = "MusePi Pro";
> this is a little bit short, how about make it "SpacemiT MusePi Pro"?
Sounds good to me.

> 
> > +	compatible = "spacemit,musepi-pro", "spacemit,k1";
> > +
> > +	aliases {
> > +		serial0 = &uart0;
> > +	};
> > +
> > +	chosen {
> > +		stdout-path = "serial0";
> > +	};
> > +
> > +	leds {
> > +		compatible = "gpio-leds";
> > +
> > +		led1 {
> > +			label = "sys-led";
> > +			gpios = <&gpio K1_GPIO(96) GPIO_ACTIVE_HIGH>;
> > +			linux,default-trigger = "heartbeat";
> > +			default-state = "on";
> > +		};
> > +	};
> > +};
> > +
> > +&uart0 {
> ..
> > +	pinctrl-names = "default";
> > +	pinctrl-0 = <&uart0_2_cfg>;
> swap these two lines, for similar reason, see my comment here
> https://lore.kernel.org/all/20250918133209-GYB1273705@gentoo.org/
Thanks for this link.
> 
> > +	status = "okay";
> > +};
> > 
> > -- 
> > 2.51.0
> > 
> 
> while you are here, I'd suggest to push as many features as possible
> instead of this minimal DT, which say - PMU, emmc, ethernet should be ready..
> (ethernet is in next, should show up at v6.18-rc1)
Good idea.
I think I should split these into multiple commits, right?
Like, PDMA and EMAC should definitely be two separate commits.

                                  - Troy
> 
> -- 
> Yixun Lan (dlan)
>

Re: [PATCH 2/2] riscv: dts: spacemit: Add MusePi Pro board device tree

Posted by Yixun Lan 4 months, 2 weeks ago

Hi Troy,

On 16:05 Sun 28 Sep     , Troy Mitchell wrote:
> On Sun, Sep 28, 2025 at 04:00:03PM +0800, Yixun Lan wrote:
> > Hi Troy,
> > 
> > On 12:16 Sun 28 Sep     , Troy Mitchell wrote:
> > > From: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> > > 
> > > Add initial device tree support for the MusePi Pro board [1].
> > > The board is using the SpacemiT K1/M1 SoC.
> > > 
> > > The device tree is adapted from the SpacemiT vendor tree [2].
> > > 
> > > This minimal device tree enables booting into a serial console with UART
> > > output and a blinking LED.
> > > 
> > > Link:
> > > https://developer.spacemit.com/documentation?token=YJtdwnvvViPVcmkoPDpcvwfVnrh&type=pdf [1]
> > > https://gitee.com/bianbu-linux/linux-6.6/blob/k1-bl-v2.2.y/arch/riscv/boot/dts/spacemit/k1-x_MUSE-Pi-Pro.dts [2]
> > > 
> > same as patch 1
> > > Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> > > ---
..[snip]
> > 
> > while you are here, I'd suggest to push as many features as possible
> > instead of this minimal DT, which say - PMU, emmc, ethernet should be ready..
> > (ethernet is in next, should show up at v6.18-rc1)
> Good idea.
> I think I should split these into multiple commits, right?
> Like, PDMA and EMAC should definitely be two separate commits.
> 
IMO, not really necessary, but I wouldn't mind either..

-- 
Yixun Lan (dlan)

Re: [PATCH 2/2] riscv: dts: spacemit: Add MusePi Pro board device tree

Posted by Troy Mitchell 4 months, 2 weeks ago

On Sun, Sep 28, 2025 at 04:50:10PM +0800, Yixun Lan wrote:
> Hi Troy,
> 
> On 16:05 Sun 28 Sep     , Troy Mitchell wrote:
> > On Sun, Sep 28, 2025 at 04:00:03PM +0800, Yixun Lan wrote:
> > > Hi Troy,
> > > 
> > > On 12:16 Sun 28 Sep     , Troy Mitchell wrote:
> > > > From: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> > > > 
> > > > Add initial device tree support for the MusePi Pro board [1].
> > > > The board is using the SpacemiT K1/M1 SoC.
> > > > 
> > > > The device tree is adapted from the SpacemiT vendor tree [2].
> > > > 
> > > > This minimal device tree enables booting into a serial console with UART
> > > > output and a blinking LED.
> > > > 
> > > > Link:
> > > > https://developer.spacemit.com/documentation?token=YJtdwnvvViPVcmkoPDpcvwfVnrh&type=pdf [1]
> > > > https://gitee.com/bianbu-linux/linux-6.6/blob/k1-bl-v2.2.y/arch/riscv/boot/dts/spacemit/k1-x_MUSE-Pi-Pro.dts [2]
> > > > 
> > > same as patch 1
> > > > Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> > > > ---
> ..[snip]
> > > 
> > > while you are here, I'd suggest to push as many features as possible
> > > instead of this minimal DT, which say - PMU, emmc, ethernet should be ready..
> > > (ethernet is in next, should show up at v6.18-rc1)
> > Good idea.
> > I think I should split these into multiple commits, right?
> > Like, PDMA and EMAC should definitely be two separate commits.
> > 
> IMO, not really necessary, but I wouldn't mind either..
Thanks.
Then I will split them to keep clear.

                        - Troy
> 
> -- 
> Yixun Lan (dlan)
>

Re: [PATCH 2/2] riscv: dts: spacemit: Add MusePi Pro board device tree

Posted by E Shattow 4 months, 2 weeks ago

On 9/27/25 21:16, Troy Mitchell wrote:
> From: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> 
> Add initial device tree support for the MusePi Pro board [1].
> The board is using the SpacemiT K1/M1 SoC.
> 
> The device tree is adapted from the SpacemiT vendor tree [2].
> 
> This minimal device tree enables booting into a serial console with UART
> output and a blinking LED.
> 
> Link:
> https://developer.spacemit.com/documentation?token=YJtdwnvvViPVcmkoPDpcvwfVnrh&type=pdf [1]
> https://gitee.com/bianbu-linux/linux-6.6/blob/k1-bl-v2.2.y/arch/riscv/boot/dts/spacemit/k1-x_MUSE-Pi-Pro.dts [2]
> 
> Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> ---
>  arch/riscv/boot/dts/spacemit/Makefile          |  1 +
>  arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts | 40 ++++++++++++++++++++++++++
>  2 files changed, 41 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/spacemit/Makefile b/arch/riscv/boot/dts/spacemit/Makefile
> index 152832644870624d8fd77684ef33addb42b0baf3..76b98096e2a46c3192651d6d66af7742f740c635 100644
> --- a/arch/riscv/boot/dts/spacemit/Makefile
> +++ b/arch/riscv/boot/dts/spacemit/Makefile
> @@ -2,3 +2,4 @@
>  dtb-$(CONFIG_ARCH_SPACEMIT) += k1-bananapi-f3.dtb
>  dtb-$(CONFIG_ARCH_SPACEMIT) += k1-milkv-jupiter.dtb
>  dtb-$(CONFIG_ARCH_SPACEMIT) += k1-orangepi-rv2.dtb
> +dtb-$(CONFIG_ARCH_SPACEMIT) += k1-musepi-pro.dtb
> diff --git a/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
> new file mode 100644
> index 0000000000000000000000000000000000000000..3791186ce47b88887eab4321dcd7035668e7f02d
> --- /dev/null
> +++ b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
> @@ -0,0 +1,40 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Copyright (C) 2024 Yangyu Chen <cyy@cyyself.name>
> + * Copyright (C) 2025 Troy Mitchell <troy.mitchell@linux.spacemit.com>
> + */
> +
> +/dts-v1/;
> +
> +#include "k1.dtsi"
> +#include "k1-pinctrl.dtsi"
> +
> +/ {
> +	model = "MusePi Pro";
> +	compatible = "spacemit,musepi-pro", "spacemit,k1";
> +
> +	aliases {
> +		serial0 = &uart0;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0";
> +	};
> +
> +	leds {
> +		compatible = "gpio-leds";
> +

> +		led1 {
> +			label = "sys-led";
> +			gpios = <&gpio K1_GPIO(96) GPIO_ACTIVE_HIGH>;
> +			linux,default-trigger = "heartbeat";
> +			default-state = "on";

Can you explain how you decided to sort this?  I think the documentation
examples needs updating but it is unclear to me.

> +		};
> +	};
> +};
> +
> +&uart0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&uart0_2_cfg>;
> +	status = "okay";
> +};
> 

Best regards,

-E Shattow

Re: [PATCH 2/2] riscv: dts: spacemit: Add MusePi Pro board device tree

Posted by Troy Mitchell 4 months, 2 weeks ago

On Sat, Sep 27, 2025 at 10:05:54PM -0700, E Shattow wrote:
> On 9/27/25 21:16, Troy Mitchell wrote:
> > From: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> > 
> > Add initial device tree support for the MusePi Pro board [1].
> > The board is using the SpacemiT K1/M1 SoC.
> > 
> > The device tree is adapted from the SpacemiT vendor tree [2].
> > 
> > This minimal device tree enables booting into a serial console with UART
> > output and a blinking LED.
> > 
> > Link:
> > https://developer.spacemit.com/documentation?token=YJtdwnvvViPVcmkoPDpcvwfVnrh&type=pdf [1]
> > https://gitee.com/bianbu-linux/linux-6.6/blob/k1-bl-v2.2.y/arch/riscv/boot/dts/spacemit/k1-x_MUSE-Pi-Pro.dts [2]
> > 
> > Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
> > ---
> >  arch/riscv/boot/dts/spacemit/Makefile          |  1 +
> >  arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts | 40 ++++++++++++++++++++++++++
> >  2 files changed, 41 insertions(+)
> > 
> > diff --git a/arch/riscv/boot/dts/spacemit/Makefile b/arch/riscv/boot/dts/spacemit/Makefile
> > index 152832644870624d8fd77684ef33addb42b0baf3..76b98096e2a46c3192651d6d66af7742f740c635 100644
> > --- a/arch/riscv/boot/dts/spacemit/Makefile
> > +++ b/arch/riscv/boot/dts/spacemit/Makefile
> > @@ -2,3 +2,4 @@
> >  dtb-$(CONFIG_ARCH_SPACEMIT) += k1-bananapi-f3.dtb
> >  dtb-$(CONFIG_ARCH_SPACEMIT) += k1-milkv-jupiter.dtb
> >  dtb-$(CONFIG_ARCH_SPACEMIT) += k1-orangepi-rv2.dtb
> > +dtb-$(CONFIG_ARCH_SPACEMIT) += k1-musepi-pro.dtb
> > diff --git a/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..3791186ce47b88887eab4321dcd7035668e7f02d
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
> > @@ -0,0 +1,40 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +/*
> > + * Copyright (C) 2024 Yangyu Chen <cyy@cyyself.name>
> > + * Copyright (C) 2025 Troy Mitchell <troy.mitchell@linux.spacemit.com>
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include "k1.dtsi"
> > +#include "k1-pinctrl.dtsi"
> > +
> > +/ {
> > +	model = "MusePi Pro";
> > +	compatible = "spacemit,musepi-pro", "spacemit,k1";
> > +
> > +	aliases {
> > +		serial0 = &uart0;
> > +	};
> > +
> > +	chosen {
> > +		stdout-path = "serial0";
> > +	};
> > +
> > +	leds {
> > +		compatible = "gpio-leds";
> > +
> 
> > +		led1 {
> > +			label = "sys-led";
> > +			gpios = <&gpio K1_GPIO(96) GPIO_ACTIVE_HIGH>;
> > +			linux,default-trigger = "heartbeat";
> > +			default-state = "on";
> 
> Can you explain how you decided to sort this?  I think the documentation
> examples needs updating but it is unclear to me.
This snippet comes from the BPI-F3 DTS.
I only verified the pins and polarity against the schematic.

                           - Troy
> 
> > +		};
> > +	};
> > +};
> > +
> > +&uart0 {
> > +	pinctrl-names = "default";
> > +	pinctrl-0 = <&uart0_2_cfg>;
> > +	status = "okay";
> > +};
> > 
> 
> Best regards,
> 
> -E Shattow
>