* [PATCH] Documentation: admin-guide: add earlycon documentation for RISC-V
@ 2019-10-09 19:53 Paul Walmsley
2019-10-10 7:10 ` Geert Uytterhoeven
2019-10-17 16:10 ` Christoph Hellwig
0 siblings, 2 replies; 7+ messages in thread
From: Paul Walmsley @ 2019-10-09 19:53 UTC (permalink / raw)
To: Jonathan Corbet
Cc: linux-doc, Andreas Schwab, linux-kernel, Geert Uytterhoeven,
linux-riscv, Christoph Hellwig
Kernels booting on RISC-V can specify "earlycon" with no options on
the Linux command line, and the generic DT earlycon support will query
the "chosen/stdout-path" property (if present) to determine which
early console device to use. Document this appropriately in the
admin-guide.
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andreas Schwab <schwab@suse.de>
---
Documentation/admin-guide/kernel-parameters.txt | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index c7ac2f3ac99f..011fee969ece 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -990,6 +990,10 @@
[X86] When used with no options the early console is
determined by the ACPI SPCR table.
+ [RISCV] When used with no options, the early
+ console is determined by the stdout-path
+ property in the device tree's chosen node.
+
cdns,<addr>[,options]
Start an early, polled-mode console on a Cadence
(xuartps) serial port at the specified address. Only
--
2.23.0
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^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH] Documentation: admin-guide: add earlycon documentation for RISC-V
2019-10-09 19:53 [PATCH] Documentation: admin-guide: add earlycon documentation for RISC-V Paul Walmsley
@ 2019-10-10 7:10 ` Geert Uytterhoeven
2019-10-10 17:23 ` Jonathan Corbet
2019-10-17 16:10 ` Christoph Hellwig
1 sibling, 1 reply; 7+ messages in thread
From: Geert Uytterhoeven @ 2019-10-10 7:10 UTC (permalink / raw)
To: Paul Walmsley
Cc: open list:DOCUMENTATION, Andreas Schwab, Jonathan Corbet,
Linux Kernel Mailing List, linux-riscv, Christoph Hellwig
On Wed, Oct 9, 2019 at 9:53 PM Paul Walmsley <paul.walmsley@sifive.com> wrote:
> Kernels booting on RISC-V can specify "earlycon" with no options on
> the Linux command line, and the generic DT earlycon support will query
> the "chosen/stdout-path" property (if present) to determine which
> early console device to use. Document this appropriately in the
> admin-guide.
>
> Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
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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* Re: [PATCH] Documentation: admin-guide: add earlycon documentation for RISC-V
2019-10-10 7:10 ` Geert Uytterhoeven
@ 2019-10-10 17:23 ` Jonathan Corbet
2019-11-08 6:10 ` Christoph Hellwig
0 siblings, 1 reply; 7+ messages in thread
From: Jonathan Corbet @ 2019-10-10 17:23 UTC (permalink / raw)
To: Geert Uytterhoeven
Cc: open list:DOCUMENTATION, Andreas Schwab,
Linux Kernel Mailing List, Paul Walmsley, linux-riscv,
Christoph Hellwig
On Thu, 10 Oct 2019 09:10:18 +0200
Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> On Wed, Oct 9, 2019 at 9:53 PM Paul Walmsley <paul.walmsley@sifive.com> wrote:
> > Kernels booting on RISC-V can specify "earlycon" with no options on
> > the Linux command line, and the generic DT earlycon support will query
> > the "chosen/stdout-path" property (if present) to determine which
> > early console device to use. Document this appropriately in the
> > admin-guide.
> >
> > Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Applied, thanks.
jon
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] Documentation: admin-guide: add earlycon documentation for RISC-V
2019-10-10 17:23 ` Jonathan Corbet
@ 2019-11-08 6:10 ` Christoph Hellwig
2019-11-11 17:30 ` Paul Walmsley
0 siblings, 1 reply; 7+ messages in thread
From: Christoph Hellwig @ 2019-11-08 6:10 UTC (permalink / raw)
To: Jonathan Corbet
Cc: open list:DOCUMENTATION, Andreas Schwab,
Linux Kernel Mailing List, Geert Uytterhoeven, Paul Walmsley,
linux-riscv, Christoph Hellwig
Jon,
can you please revert this? The paragraph above this addition already
describes the riscv case perfecty well with my previous patch:
earlycon= [KNL] Output early console device and options.
When used with no options, the early console is
determined by stdout-path property in device tree's
chosen node or the ACPI SPCR table if supported by
the platform.
[RISCV] When used with no options, the early
console is determined by the stdout-path
property in the device tree's chosen node.
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* Re: [PATCH] Documentation: admin-guide: add earlycon documentation for RISC-V
2019-11-08 6:10 ` Christoph Hellwig
@ 2019-11-11 17:30 ` Paul Walmsley
2019-11-12 16:44 ` Jonathan Corbet
0 siblings, 1 reply; 7+ messages in thread
From: Paul Walmsley @ 2019-11-11 17:30 UTC (permalink / raw)
To: Christoph Hellwig
Cc: open list:DOCUMENTATION, Andreas Schwab, Jonathan Corbet,
Linux Kernel Mailing List, Geert Uytterhoeven, Paul Walmsley,
linux-riscv
Hi Jon,
On Fri, 8 Nov 2019, Christoph Hellwig wrote:
> can you please revert this? The paragraph above this addition already
> describes the riscv case perfecty well with my previous patch:
>
> earlycon= [KNL] Output early console device and options.
>
> When used with no options, the early console is
> determined by stdout-path property in device tree's
> chosen node or the ACPI SPCR table if supported by
> the platform.
>
> [RISCV] When used with no options, the early
> console is determined by the stdout-path
> property in the device tree's chosen node.
I support reverting the RISCV section, now that Christoph's more general
change has gone in.
- Paul
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* Re: [PATCH] Documentation: admin-guide: add earlycon documentation for RISC-V
2019-11-11 17:30 ` Paul Walmsley
@ 2019-11-12 16:44 ` Jonathan Corbet
0 siblings, 0 replies; 7+ messages in thread
From: Jonathan Corbet @ 2019-11-12 16:44 UTC (permalink / raw)
To: Paul Walmsley
Cc: open list:DOCUMENTATION, Andreas Schwab,
Linux Kernel Mailing List, Geert Uytterhoeven, Paul Walmsley,
linux-riscv, Christoph Hellwig
On Mon, 11 Nov 2019 17:30:13 +0000 (UTC)
Paul Walmsley <paul@pwsan.com> wrote:
> On Fri, 8 Nov 2019, Christoph Hellwig wrote:
>
> > can you please revert this? The paragraph above this addition already
> > describes the riscv case perfecty well with my previous patch:
> >
> > earlycon= [KNL] Output early console device and options.
> >
> > When used with no options, the early console is
> > determined by stdout-path property in device tree's
> > chosen node or the ACPI SPCR table if supported by
> > the platform.
> >
> > [RISCV] When used with no options, the early
> > console is determined by the stdout-path
> > property in the device tree's chosen node.
>
> I support reverting the RISCV section, now that Christoph's more general
> change has gone in.
OK, the patch has been reverted.
Thanks,
jon
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] Documentation: admin-guide: add earlycon documentation for RISC-V
2019-10-09 19:53 [PATCH] Documentation: admin-guide: add earlycon documentation for RISC-V Paul Walmsley
2019-10-10 7:10 ` Geert Uytterhoeven
@ 2019-10-17 16:10 ` Christoph Hellwig
1 sibling, 0 replies; 7+ messages in thread
From: Christoph Hellwig @ 2019-10-17 16:10 UTC (permalink / raw)
To: Paul Walmsley
Cc: linux-doc, Andreas Schwab, Jonathan Corbet, linux-kernel,
Geert Uytterhoeven, linux-riscv, Christoph Hellwig
On Wed, Oct 09, 2019 at 12:53:50PM -0700, Paul Walmsley wrote:
>
> Kernels booting on RISC-V can specify "earlycon" with no options on
> the Linux command line, and the generic DT earlycon support will query
> the "chosen/stdout-path" property (if present) to determine which
> early console device to use. Document this appropriately in the
> admin-guide.
Jon already applied a patch from me removing the bogus arch restrictions
on the earlycon without arguments documentation, so this should not
be required.
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2019-10-09 19:53 [PATCH] Documentation: admin-guide: add earlycon documentation for RISC-V Paul Walmsley
2019-10-10 7:10 ` Geert Uytterhoeven
2019-10-10 17:23 ` Jonathan Corbet
2019-11-08 6:10 ` Christoph Hellwig
2019-11-11 17:30 ` Paul Walmsley
2019-11-12 16:44 ` Jonathan Corbet
2019-10-17 16:10 ` Christoph Hellwig
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