Re: [PATCH v2 0/8] serial: Add MMIO & SPCR support

[Daniel Kiper]

On Fri, Dec 23, 2022 at 12:47:51PM +1100, Benjamin Herrenschmidt wrote:
> This series adds support for MMIO serial ports and auto-configuration
> via ACPI SPCR.
>
> This is necessary for the serial port to work on AWS EC2 "metal" x86
> systems.
>
> An MMIO serial port can be specified explicitely using the
> "mmio," prefix for the --port argument to the 'serial' command,
> the register access size can also be specified via a suffix,
> and when 'serial' is used without arguments, it will try to use
> an ACPI SPCR entry (if any) to add the default port and configure
> it appropriately (speed, parity etc...)
>
> This was tested using SPCR on an actual c5.metal instance, and using
> explicit instanciation via serial -p mmioXXXXXXXX on a modified qemu
> hacked to create MMIO PCI serial ports and to create a SPCR ACPI table.
>
> The insipiration was an original implementation by
> Matthias Lange ! matthias.lange at kernkonzept.com
> However, the code was rewritten pretty much from scratch.

For all the patches Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>...

Thank you for adding this feature!

Daniel