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

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Date:   Wed, 12 Feb 2020 16:18:21 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Lukas Wunner <lukas@...ner.de>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     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 12/02/2020 14:28, Lukas Wunner wrote:
> 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.
> 

Can you provide your device tree please. I suspect that we find the culprit there.

Regards,
Matthias

> 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
>