linux-kernel - Re: [PATCH] tty: serial: Add earlycon driver for Tegra Combined UART

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Message-ID: <YfEC97fmxvVwpNV+@alf.mars>
Date:   Wed, 26 Jan 2022 09:14:47 +0100
From:   Helmut Grohne <helmut@...divi.de>
To:     Mikko Perttunen <mperttunen@...dia.com>
Cc:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        thierry.reding@...il.com, jonathanh@...dia.com,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH] tty: serial: Add earlycon driver for Tegra Combined UART

On Sat, Feb 13, 2021 at 01:58:24PM +0200, Mikko Perttunen wrote:
> Add an earlycon driver for platforms with TCU, namely Tegra194.
> The driver is compatible with boot parameters passed by NVIDIA
> boot chains.

I confirm that this patch applies mostly cleanly (modulo minor Makefile
issue) to v5.16 and that it works with the vendor cboot on a Xavier AGX
device. I assume that it is expected that the earlycon output comes out
twice (once from the earlycon driver and another time from the real
driver).

Tested-by: Helmut Grohne <helmut.grohne@...enta.de>

Some of the concerns from Thierry Reding remain unaddressed though.

Helmut