In standalone applications, it seems that the execution of printf
function in U-Boot is dependent on the value of register R9, which is
setup in app_startup. But r9 can be used by your program at the
decision of gcc compilation which is not aware of this dependence.
This is especially the case if +O2 is used!

My version is U-Boot 2014.10

Regards,
Dashi Cao
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