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 <[email protected]>
Reported-by: Andreas Schwab <[email protected]>
Cc: Christoph Hellwig <[email protected]>
---
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
--
2.23.0
Hi Paul,
On Wed, Oct 9, 2019 at 1:09 AM Paul Walmsley <[email protected]> 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 <[email protected]>
> Reported-by: Andreas Schwab <[email protected]>
> Cc: Christoph Hellwig <[email protected]>
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 -- [email protected]
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
On Okt 09 2019, Geert Uytterhoeven <[email protected]> wrote:
> I believe risc-v is DT-only, so if chosen/stdout-path is set up
If. Currently, it isn't.
Andreas.
--
Andreas Schwab, SUSE Labs, [email protected]
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
Hi Andreas,
On Wed, Oct 9, 2019 at 12:06 PM Andreas Schwab <[email protected]> wrote:
> On Okt 09 2019, Geert Uytterhoeven <[email protected]> wrote:
> > I believe risc-v is DT-only, so if chosen/stdout-path is set up
>
> If. Currently, it isn't.
IC. So isn't it better to fix that, instead of pointing people to more obscure
legacy solutions?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
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
Hi Geert,
On Wed, 9 Oct 2019, Geert Uytterhoeven wrote:
> On Wed, Oct 9, 2019 at 12:06 PM Andreas Schwab <[email protected]> wrote:
> > On Okt 09 2019, Geert Uytterhoeven <[email protected]> wrote:
> > > I believe risc-v is DT-only, so if chosen/stdout-path is set up
> >
> > If. Currently, it isn't.
>
> IC. So isn't it better to fix that, instead of pointing people to more obscure
> legacy solutions?
There's nothing that's RISC-V specific about the SiFive serial IP or
its driver. So the issue of whether RISC-V is DT-only or not probably
shouldn't impact whether we document that the SiFive serial driver
supports earlycon.
best regards,
- Paul