linux-kernel - Re: [RFC PATCH net-next] net: stmmac: Preserve bootloader MAC address across unconditional reset

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Message-ID: <CA+V-a8sQTRZOFk=KASum4Gi4cKK7NdLZu1W0n4ZyWPuKGSc9uQ@mail.gmail.com>
Date: Tue, 27 Jan 2026 15:54:57 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>, Andrew Lunn <andrew+netdev@...n.ch>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...s.st.com>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Geert Uytterhoeven <geert+renesas@...der.be>, netdev@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [RFC PATCH net-next] net: stmmac: Preserve bootloader MAC address
 across unconditional reset

Hi Geert,

On Tue, Jan 27, 2026 at 1:57 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Tue, 27 Jan 2026 at 14:39, Lad, Prabhakar <prabhakar.csengg@...il.com> wrote:
> > On Mon, Jan 26, 2026 at 6:11 PM Russell King (Oracle)
> > <linux@...linux.org.uk> wrote:
> > > On Mon, Jan 26, 2026 at 05:25:03PM +0000, Prabhakar wrote:
> > > where "local-mac-address" states the MAC address to be used for eth0,
> > > as specified by the boot loader.
> > >
> > Thanks for the pointer, I will use the above-mentioned method with
> > which we won't be needing this patch on the RZ/T2H platform.
>
> This should already work out-of-the-box, as
> arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi already has:
>
>     aliases {
>             ethernet3 = &gmac1;
>             ethernet2 = &gmac2;
>
> So just make sure to set the "eth2addr" and "eth3addr" environment
> variables in U-Boot.
>
Agreed, it was just that the aliases in Linux and u-boot didn't match
up (Ive notified the BSP team to update it accordingly).

Cheers,
Prabhakar