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Re: [PATCH 1/3] cmdline: Document console=dtuart option
- To: Michal Orzel <michal.orzel@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 2 Sep 2026 10:55:15 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 02 Sep 2026 08:55:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.09.2026 09:36, Michal Orzel wrote:
> Document the default console= option on Arm and RISC-V that is
> "dtuart" indicating a generic UART parsed from a device tree or
> ACPI SPCR table. This serial utilizes SERHND_DTUART handle.
>
> Take the opportunity to:
> - fix documented x86 default to vga to match OPT_CONSOLE_STR,
I first wanted to object to this part, as I was sure this used to be
"com1,vga". Yet indeed it's been almost 19 years ago when this was
changed (92877a1f9ab2 ["x86: Auto-probe the serial port baud rate if
'com1' or 'com2' is"]).
> - mark dtuart option as available on RISC-V,
> - document fall back to /chosen/stdout-path.
>
> Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
> --- a/docs/misc/xen-command-line.pandoc
> +++ b/docs/misc/xen-command-line.pandoc
> @@ -430,9 +430,10 @@ The following are examples of correct specifications:
> Specify the size of the console ring buffer.
>
> ### console
> -> `= List of [ vga | com1[H,L] | com2[H,L] | pv | dbgp | ehci | xhci | none
> ]`
> +> `= List of [ vga | com1[H,L] | com2[H,L] | pv | dbgp | ehci | xhci |
> dtuart | none ]`
>
> -> Default: `console=com1,vga`
> +> Default (x86): `console=vga`
> +> Default (Arm, RISC-V): `console=dtuart`
Any reason to not also cover PPC here?
Jan
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