Re: [PATCH RFC 0/3] Add DCC uart console support

[Peter Maydell]

On Fri, 14 Jun 2024 at 10:30, Sai Pavan Boddu <sai.pavan.boddu@amd.com> wrote:
>
> This patch series attaches a chardev to  arm Debug Communication channel 
> registers,
> As each cpu has it own DBGDTRTX/RX register just tried to hook each cpu
> with chardev iff we find a chardev with id "dcc<cpu-id>".
>
> ex:
>     Below chardev switch would be connected to A53-0.
>
>     ./qemu-system-aarch64 -M xlnx-zcu102 -kernel u-boot-dtb.bin
>       -dtb zynqmp-zcu102-rev1.1.d -display none -m 2G
>       -chardev stdio,id=dcc0

This is neat -- I've thought before that it would be nice to be able
to use the DCC as a chardev destination, given that Linux has support
for earlycon-over-DCC. The thing that put me off was the question
of what the command-line syntax for setting it up ought to be, though.
I'm not sure we want "look for the chardev with a particular ID string"
but I don't know what existing in-tree precedent we have for this
kind of thing.

thanks
-- PMM