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SubjectRe: [PATCH] Documentation: admin-guide: add earlycon documentation for the sifive serial driver
Hi Paul,

On Wed, Oct 9, 2019 at 1:09 AM Paul Walmsley <paul.walmsley@sifive.com> wrote:
> Document earlycon usage for the SiFive serial port driver in the same
> fashion as for the other serial port IP blocks, since the SiFive
> serial port driver supports it.
>
> Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
> Reported-by: Andreas Schwab <schwab@suse.de>
> Cc: Christoph Hellwig <hch@lst.de>

Thanks for your patch!

Why do you need this?
I believe risc-v is DT-only, so if chosen/stdout-path is set up, just
passing "earlycon" (without any options) should work.

> ---
> Documentation/admin-guide/kernel-parameters.txt | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index c7ac2f3ac99f..90becb00221b 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -1106,6 +1106,12 @@
> address must be provided, and the serial port must
> already be setup and configured.
>
> + sifive,<addr>
> + Start an early, polled-mode console on a SiFive
> + serial port at the specified address. The port must
> + already be setup and configured. Options are not
> + yet supported.
> +
> earlyprintk= [X86,SH,ARM,M68k,S390]
> earlyprintk=vga
> earlyprintk=sclp

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds

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