OK, last result about VBUS -

I repeated the test (boost VBUS with DRVVBUS of OTG_CTRL register of TWL4030 chip) with naked cable and multimeter:

N900 --- cable --- USB memory stick

and measured voltages.

Between black and red cable - 3.5V
Between red and another cable - 2.5V

Another combinations gave me around 0 or 1.5V

EDIT: this time a can't get a repeated session setup. Only "cable problem" or so message. However, it was in HOST mode - it tries to enumerate usb1-0.