On Wednesday, September 14, 2016 7:26:22 PM CEST zhichang wrote:

quoted

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Hip06 LPC uart need two base addresses for earlycon.
2. the IO type is mmio to introduce a memory base address to access LPC register file. But the real uart
IO type is UPIO_PORT. This is spcial...

This sounds like a deficiency in the of_setup_earlycon() function,
which can only handle MMIO addresses, and won't actually
be able to understand nodes without a "ranges" property like
you have here.

Yes.
The current of_setup_earlycon only support MMIO and the first reg property must be memory.

We can not support our LPC uart without any new code.
But we can implement a private earlycon setup function and register
it to the __earlycon_table, things will be ok.

I still think you should adapt of_setup_earlycon instead to handle IORESOURCE_IO
registers.

	Arnd