Hi.
I think there are three places where console could be enabled.
[1] earlycon
Each driver entry is declared with
EARLYCON_DECLARE() or OF_EARLYCON_DECLARE()
[2] console_init()
Each entry is declared with console_initcall()
[3] when driver is probed
The console is usually enabled at this point
unless some special treatment is done.
My question is about [2].
I am using 8250-ish UART device.
I noticed univ8250_console_match() and univ8250_console_setup()
always fail at the point of [2] unless early_serial_setup() has been
called in advance;
however, it looks like early_serial_setup() is only used for old platforms.
So, console cannot be enabled at [2] for modern platforms.
My questions are:
- Given that earlycon can be now available for major architectures such ARM,
[2] will be deprecated at some point in the future?
- I am implementing earlycon for my own UART driver.
Is it meaningless to implement console_initcall() as well as earlycon?
--
Best Regards
Masahiro Yamada
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