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

[Matthias Brugger]

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
>