linux-kernel - Re: [PATCH] serial/sifive: select SERIAL

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Date:   Mon, 16 Sep 2019 05:18:57 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Andreas Schwab <schwab@...e.de>
cc:     Christoph Hellwig <hch@....de>, gregkh@...uxfoundation.org,
        jslaby@...e.com, linux-serial@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial/sifive: select SERIAL_EARLYCON

On Mon, 16 Sep 2019, Andreas Schwab wrote:

> On Sep 16 2019, Paul Walmsley <paul.walmsley@...ive.com> wrote:
> 
> > On Tue, 10 Sep 2019, Andreas Schwab wrote:
> >
> >> On Sep 10 2019, Christoph Hellwig <hch@....de> wrote:
> >> 
> >> > On Tue, Sep 10, 2019 at 08:57:37AM +0200, Andreas Schwab wrote:
> >> >> On Sep 10 2019, Christoph Hellwig <hch@....de> wrote:
> >> >> 
> >> >> > The sifive serial driver implements earlycon support,
> >> >> 
> >> >> It should probably be documented in admin-guide/kernel-parameters.txt.
> >> >
> >> > How so?  Wіth OF and a stdout path you just set earlycon on the
> >> > command line without any arguments and it will be found.
> >> 
> >> Doesn't work for me.
> >> 
> >> [    0.000000] Malformed early option 'earlycon'
> >
> > Try:
> >
> >     earlycon=sifive,0x10010000
> 
> That's not what Christoph wants.

I support Christoph's plan to add generic implicit earlycon support.

In the meantime, once v5.4-rc1 is released, I'll send a patch to add a 
sifive driver section to the earlycon documentation in 
admin-guide/kernel-parameters.txt.  Thanks for the (earlier) suggestion.


- Paul