MX28 & finding out boot mode

On Thu, Aug 30, 2012 at 04:25:18PM +0800, Wolfram Sang wrote:

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?

Add Frank&Peter who may know it.

Regards
Dong Aisheng