I noticed that the board is slow and the CPU freq is 300000  - Beaglebone 
Black A5B

Linux arm 3.8.13-bone32 #1 SMP Fri Dec 13 20:05:25 UTC 2013 armv7l armv7l 
armv7l GNU/Linux
root@arm:~# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
300000

I know that powering from USB the board will slow down to 300000 MHz but 
the board is powered from +5 V with a 5Amps power supply

I even boot only from power supply and attach the usb cable after boot 
sequence (monitoring LED)
Any idea how to switch to high freq ? I also have problems with the USB 
host - I presume that it is also related to wrong detection of primary 
power supply

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