Nokia RX-51: Remember setup_console_atag option
When variable setup_console_atag is unset then read default value from OMAP
atags which passed NOLO bootloader to U-Boot.
This would allow to boot Maemo Linux kernel from U-Boot with serial console
settings configured in NOLO bootloader (which loads U-Boot).
So serial console needs to be enabled only at one place, globally in NOLO.
Signed-off-by:
Pali Rohár <pali@kernel.org>
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