I found my rk3188 evb can't bootup(no any log on the console) if
I didn't define EARLY_UART in function board_init_f(rk3188_board_spl.c).
With EARLY_UART defined, I can see "first data training fail"
from console, and the system can bootup. I removed that printf,
the system can also bootup without the defined of EARLY_UART.
It seems that we shouldn't call printf before setting iomux of uart?
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2.7.4
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