linux-kernel - Re: [PATCH 6/7] riscv: dts: Add Tenstorrent Blackhole A0 SoC PCIe cards

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Message-ID: <aMmd/JQAfPwKuYyB@x1>
Date: Tue, 16 Sep 2025 10:27:24 -0700
From: Drew Fustini <fustini@...nel.org>
To: Ben Dooks <ben.dooks@...ethink.co.uk>
Cc: Conor Dooley <conor@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Alexandre Ghiti <alex@...ti.fr>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Samuel Holland <samuel.holland@...ive.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Anup Patel <anup@...infault.org>, Arnd Bergmann <arnd@...db.de>,
	Joel Stanley <jms@...storrent.com>, Joel Stanley <joel@....id.au>,
	Michael Neuling <mikey@...ling.org>,
	Nicholas Piggin <npiggin@...il.com>,
	Michael Ellerman <mpe@...nel.org>, Andy Gross <agross@...nel.org>,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, Drew Fustini <dfustini@...storrent.com>
Subject: Re: [PATCH 6/7] riscv: dts: Add Tenstorrent Blackhole A0 SoC PCIe
 cards

On Tue, Sep 16, 2025 at 02:56:05PM +0100, Ben Dooks wrote:
> On 15/09/2025 18:52, Drew Fustini wrote:
> > On Mon, Sep 15, 2025 at 05:47:08PM +0100, Conor Dooley wrote:
> > > On Sat, Sep 13, 2025 at 02:31:05PM -0700, Drew Fustini wrote:
> > > > new file mode 100644
> > > > index 0000000000000000000000000000000000000000..b2b08023643a2cebd4f924579024290bb355c9b3
> > > > --- /dev/null
> > > > +++ b/arch/riscv/boot/dts/tenstorrent/blackhole-a0-card.dts
> > > > @@ -0,0 +1,14 @@
> > > > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > > > +/dts-v1/;
> > > > +
> > > > +#include "blackhole-a0.dtsi"
> > > > +
> > > > +/ {
> > > > +	model = "Tenstorrent Blackhole A0 SoC PCIe card";
> > > > +	compatible = "tenstorrent,blackhole-a0-card", "tenstorrent,blackhole-a0";
> > > > +
> > > > +	memory@0 {
> > > > +		device_type = "memory";
> > > > +		reg = <0x4000 0x30000000 0x1 0x00000000>;
> > > 
> > > This isn't at address zero as the node address claims.
> > 
> > Thanks, I'll fix the unit address.
> 
> Is it time to just assume any dtc can handle a 64bit number?

Is it not valid for me to use the 64 bit hex number in the unit address?

I changed it to memory@...030000000 and 'W=1 dtbs_check' did not
complain. Am I doing something wrong?

-------------------------------------------------
$ git diff
diff --git a/arch/riscv/boot/dts/tenstorrent/blackhole-a0-card.dts b/arch/riscv/boot/dts/tenstorrent/blackhole-a0-card.dts
index b2b08023643a..7963712b53ea 100644
--- a/arch/riscv/boot/dts/tenstorrent/blackhole-a0-card.dts
+++ b/arch/riscv/boot/dts/tenstorrent/blackhole-a0-card.dts
@@ -7,7 +7,7 @@ / {
        model = "Tenstorrent Blackhole A0 SoC PCIe card";
        compatible = "tenstorrent,blackhole-a0-card", "tenstorrent,blackhole-a0";

-       memory@0 {
+       memory@...030000000 {
                device_type = "memory";
                reg = <0x4000 0x30000000 0x1 0x00000000>;
        };


$ make W=1 ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- -j32 dtbs_check
  DTC [C] arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dtb
  DTC [C] arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dtb
  DTC [C] arch/riscv/boot/dts/tenstorrent/blackhole-a0-card.dtb
-------------------------------------------------

Thanks,
Drew