linux-kernel - Re: [PATCH] arm64: dts: Add/fix /memory node unit-addresses

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Date: Mon, 1 Jul 2024 15:29:55 +0100
From: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
To: Thierry Reding <thierry.reding@...il.com>
Cc: "Rob Herring (Arm)" <robh@...nel.org>, soc@...nel.org, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: Add/fix /memory node unit-addresses

Hi Thierry,

On Fri, Jun 28, 2024 at 05:06:10PM GMT, Thierry Reding wrote:
> On Tue, Apr 30, 2024 at 02:18:54PM GMT, Rob Herring (Arm) wrote:
> [...]
> > diff --git a/arch/arm64/boot/dts/nvidia/tegra210-smaug.dts b/arch/arm64/boot/dts/nvidia/tegra210-smaug.dts
> > index 9ebb7369256e..2e5b6b2c1f56 100644
> > --- a/arch/arm64/boot/dts/nvidia/tegra210-smaug.dts
> > +++ b/arch/arm64/boot/dts/nvidia/tegra210-smaug.dts
> > @@ -25,7 +25,7 @@ chosen {
> >  		stdout-path = "serial0:115200n8";
> >  	};
> >  
> > -	memory {
> > +	memory@...00000 {
> >  		device_type = "memory";
> >  		reg = <0x0 0x80000000 0x0 0xc0000000>;
> >  	};
> 
> [trimming the recipient list and adding Diogo]
> 
> Sorry I just noticed this as I was doing a cleanup path of patchwork.
> 
> For tegra210-smaug, unfortunately we can't do this. The problem is that
> the firmware for this device looks for a hard-coded /memory device when
> updating with the proper memory size and this firmware can't always be
> updated.
> 
> Diogo, you're one of the few remaining people that I know of that still
> use this device (with an upstream kernel). Do you have any more details
> about this? Is there any way the firmware can be safely updated on these
> devices?

To be honest I am not quite sure. I do know that at least there is a part
of the firmware that is locked down and cannot be updated easily, as you
have to disconnect a ribbon cable inside of the device. Do you know of
any firmware updates for this device? Currently I am not aware of any.

Diogo