serial console in early boot

[Valdis.Kletnieks at vt.edu]

On Sun, 24 Aug 2014 18:02:29 -0400, John de la Garza said:

> I would expect that the serial line wouldn't be ready and that qemu
> would behave like actual hardware.

Why?

QEMU knows it's running as a user process.  Do you see anywhere in the
documentation that it guarantees emulation of real hardware? (Hint - it's
connecting your earlyprintk console to stdout, and as long as it's doing that,
there's no reason for it to *not* go the extra step and provide emulation
of the UART so you can debug early kernel problems....)
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