MX28 & finding out boot mode

[Chen Peter-B29397]

> 
> Some customers want this to handle the recovery case differently than
> the standard case.
> 

If you can't find method at datasheet (like reading some registers), a workaround
is according to usb register, usually, usbcmd.rs (pull-up DP) stands for usb is using
or not.

1. Make sure usbcmd.rs = 0 is the default value.
2. Before the usb code is running, the usbcmd.rs should be 0 at normal mode
So, get a flag before usb code is running

if (usbcmd.rs == 0)
	usb_recover_mode = 0;
else
	usb_recover_mode = 1;


Peter

> Thanks for the help!
> 
>    Wolfram
> 
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> Pengutronix e.K.                           | Wolfram Sang
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