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 <[email protected]>

Acked-by: Jan Beulich <[email protected]>

> --- 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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