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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