On 10/28/2015 09:22 AM, Peter Hurley wrote:
EARLYCON_DECLARE(zte, zte_early_console_setup);
OF_EARLYCON_DECLARE(zte, ".......", zte_early_console_setup);
EARLYCON_DECLARE(sbsa32, sbsa32_early_console_setup);
OF_EARLYCON_DECLARE(sbsa32, "arm,sbsa-uart", sbsa32_early_console_setup);
The above assumes that the sbsa32 maintains the equivalence of
earlycon and console; ie., that
/ {
chosen {
stdout-path = &uart0;
};
soc {
uart0: serial@xxxxxx {
compatible = "arm,sbsa-uart";
};
};
};
will start a sbsa32 earlycon and later replace that with
sbsa console.
I never really understood the device tree support for SBSA. The "S"
stands for Server, and ARM Server systems are supposed to use ACPI.
It's easy to add special cases via device tree, because of its
flexibility. ACPI is much more difficult, and that's why I used the
command-line approach.
Anyway, I found this alternate patch from Lief Lindholm that implements
this idea better, although it needs work:
https://patches.linaro.org/53265/
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