linux-kernel - Re: [PATCH] serial: 8250_early: Add earlycon for BCM2835 aux uart

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Message-ID: <20200212132834.c63354wynhmrg6hz@wunner.de>
Date:   Wed, 12 Feb 2020 14:28:34 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     Matthias Brugger <matthias.bgg@...il.com>, matthias.bgg@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        Matthias Brugger <mbrugger@...e.com>,
        Scott Branden <sbranden@...adcom.com>,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        Ray Jui <rjui@...adcom.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
        jslaby@...e.com
Subject: Re: [PATCH] serial: 8250_early: Add earlycon for BCM2835 aux uart

On Mon, Feb 03, 2020 at 08:10:21PM +0100, Nicolas Saenz Julienne wrote:
> On Fri, 2020-01-31 at 16:24 +0100, Lukas Wunner wrote:
> > On Thu, Jan 30, 2020 at 05:11:55PM +0100, Nicolas Saenz Julienne wrote:
> > > BTW did you had the oportunity to have a go at the patch?
> > 
> > I've just performed a quick test and it doesn't work for me.
> > If I add stdout-path = "serial1:115200n8"; to the chosen node,
> > I only get a regular console with this patch, not an earlycon.
> 
> That's surprising, you're using u-boot isn't it? and the upstream device tree?

My apologies for the delay.

We boot the kernel directly from the Foundation's bootloader without
U-Boot as intermediary, and we use the downstream DT and kernel
(with RT & custom patches).

As far as I could see, the 8250_bcm2835aux UART wasn't even found
when the kernel searched for available earlycons.  The compatible
string in the DT does match the one in Matthias' patch.

I notice that Greg has already applied the patch to tty/next.
I'm currently stretched a little thin but I'll debug this further
once the dust has settled here.

Thanks,

Lukas