linux-kernel - Re: [PATCH 4/5] arm64: dts: allwinner: a527: add EMAC0 to Radxa A5E board

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Message-ID: <caad87f2-8243-4571-8236-6aa3d4fb9fab@lunn.ch>
Date: Thu, 24 Apr 2025 15:32:12 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Andre Przywara <andre.przywara@....com>
Cc: Yixun Lan <dlan@...too.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Maxime Ripard <mripard@...nel.org>,
	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>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 4/5] arm64: dts: allwinner: a527: add EMAC0 to Radxa A5E
 board

> Speaking of which: do you know of a good method to verify the delay
> timing? Is there *something* which is sensitive to those timings and which
> can be easily checked and qualified?

Not really. If you are on the edge, you might get more ethernet FCS
errors. For iperf3 in UDP mode, that would translate to packet loss.
Or ethtool -S might report checksum errors, depending on the driver.

>From what i've heard from others there is a pretty sharp cut off from
broken to working. Just stay away from the cliff and it should be
O.K. for −40°C to 85°C, or whatever the temperate range is supposed to
be.

	Andrew