Re: [PATCH v3 1/3] xen/ns16550: Make ns16550 driver usable on ARM with HAS_PCI enabled.

[Jan Beulich <jbeulich@xxxxxxxx>]

On 18.11.2020 16:35, Julien Grall wrote:
> So even we are going to enable PCI on Arm and fix compilation issue, 
> there are no way the NS16550 PCI would be usuable without effort for a 
> few reasons:
> 
>    1) com1/com2 is x86 specific
>    2) ns16550_init() is not used by Arm and the only way to use a PCI UART

This is a good observation, and I wasn't aware of this. I'm sending
a patch which ...

>    3) UART is discovered through the device-tree/ACPI tables on Arm
> 
> So I think CONFIG_HAS_NS16550_PCI is most suitable solution and we 
> should probably guard more code (e.g. ns16550_init(), com1, com2...).

... hopefully fulfills this (to be considered a prereq to Rahul's
series then).

Jan