fast boot and normal boot difference on beagleboard c3

i have written an application on beagleboard using i2c lines. i have
enabled i2c lines
when i boot the board in fast boot mode and run the application it
behaves in one type and when i boot the board in normal mode and run
the application it behaves in another form..

the debug messages in fast mode are displayed but the debug messages
in normal mode are not dispayed...

have anyone seen this type of behavior ?

another issue..
adb is not accessible in normal mode and is accessible in fast
boot ...