[RESEND PATCH v2] netconsole: various improvements

[Tom Rini]

On Mon, Apr 03, 2023 at 02:41:52PM -0700, Tony Dinh wrote:

> Use CONFIG_CONSOLE_MUX for netconsole. When netconsole is running,
> stdin/stdout/stder must be set to some primary console, in addtion to nc.
> For example, stdin=serial,nc. Some recent Linux kernels will not boot with
> only nc on the stdout list, ie. stdout=nc. When netconsole exits, remove
> nc from the list of devices in stdin/stdout/stderr.
> 
> Signed-off-by: Tony Dinh <mibodhi at gmail.com>

This breaks the ut_bootstd_bootflow_cmd_boot test on sandbox. I'm not
sure if it's a test issue or something else.

-- 
Tom
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