MX28 & finding out boot mode

Hi,

is there a way to find out how the MX28 was booted? I could read out the
bootmode-pins for indication. Still, either by button or by empty NAND,
the CPU could have been booted via USB recovery mode. And going through
the docs and the bootlets code, I can't find a way to determine if USB
recovery was used.

So, can USB recovery mode be detected somehow? Then, this and reading
pins should be sufficent, no?

Thanks,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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