Simon Glass 093f79ab88
Add a flag indicating when the serial console is ready ...
For sandbox we have a fallback console which is used very early in
U-Boot, before serial drivers are available. Rather than try to guess
when to switch to the real console, add a flag so we can be sure. This
makes sure that sandbox can always output a panic() message, for example,
and avoids silent failure (which is very annoying in sandbox).
Signed-off-by: Simon Glass <sjg@chromium.org >
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093f79ab88