linux-kernel - Re: [PATCH v2 2/5] openrisc: dts: Add de0 nano config and devicetree

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Message-ID: <aVzb6pStdagr3IUX@antec>
Date: Tue, 6 Jan 2026 09:54:50 +0000
From: Stafford Horne <shorne@...il.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Linux OpenRISC <linux-openrisc@...r.kernel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Jonas Bonn <jonas@...thpole.se>,
	Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/5] openrisc: dts: Add de0 nano config and devicetree

On Mon, Jan 05, 2026 at 12:02:52PM +0100, Geert Uytterhoeven wrote:
> Hi Stafford,
> 
> On Sat, 3 Jan 2026 at 07:17, Stafford Horne <shorne@...il.com> wrote:
> > On Thu, Dec 18, 2025 at 07:36:08PM +0100, Geert Uytterhoeven wrote:
> > > On Wed, 17 Dec 2025 at 09:23, Stafford Horne <shorne@...il.com> wrote:
> > > > The de0 nano from Terasic is an FPGA board that we use in the OpenRISC
> > > > community to test OpenRISC configurations.  Add a base configuration for
> > > > the board that runs an OpenRISC CPU at 50Mhz with 32MB ram, UART for
> > > > console and some GPIOs for LEDs and switches.
> > > >
> > > > There is an older version of this floating around that defines all of
> > > > the hardware on the board including SPI's, flash devices, sram, ADCs
> > > > etc.  Eventually it would be good to get the full version upstream
> > > > but for now I think a minimal board is good to start with.
> > > >
> > > > Link: https://openrisc.io/tutorials/de0_nano/
> > > > Link: https://github.com/olofk/de0_nano
> > > >
> > > > Signed-off-by: Stafford Horne <shorne@...il.com>
> 
> > > > --- /dev/null
> > > > +++ b/arch/openrisc/boot/dts/de0-nano.dts
> > > > @@ -0,0 +1,54 @@
> > > > +// SPDX-License-Identifier: GPL-2.0
> > > > +
> > > > +/dts-v1/;
> > > > +
> > > > +#include "de0-nano-common.dtsi"
> > > > +
> > > > +/ {
> > > > +       model = "Terasic DE0 Nano";
> > > > +       compatible = "opencores,or1ksim";
> > > > +       #address-cells = <1>;
> > > > +       #size-cells = <1>;
> > > > +       interrupt-parent = <&pic>;
> > > > +
> > > > +       aliases {
> > > > +               uart0 = &serial0;
> > > > +       };
> > > > +
> > > > +       chosen {
> > > > +               bootargs = "earlycon";
> > >
> > > Do you need this?
> >
> > What do you mean here? I want to keep "earlycon", and it is not supplied in
> > de0-nano-common.dtsi.
> 
> Why do you want to keep it? "earlycon" is a typical debug option,
> and should not be needed during normal use.

I see, I am always debugging so I leave it on.  But, good point for these
default configs.  I'll remove the debug defaults.

Just curious, Do you have a quick way to enable out of tree debug patches i.e.
to dts and defconfigs?

-Stafford