Simon Glass
a781c37746
expo: Add a function to poll for input
...
Both bootflow_menu and cedit use similar logic to poll an expo. Move
this into the expo library so the code can be shared.
Update bootflow_menu_run() to return -EPIPE when the user quits without
choosing anything, since -EAGAIN is ambiguous and elsewhere means that
there is no input yet.
Signed-off-by: Simon Glass <sjg@chromium.org >
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