How to judge from the hardware point of view TX1 successfully entered recovery mode.

Prerequisites:
Customized external circuit boards.

Operating

  1. DC power supply 9v
  2. Press the power key. There is a 180mA current shown on the Digital power supply.
  3. Hold on recovery key and Press reset key. There is a 130mA current shown on the Digital power supply.

Result

  1. There is no Nvidia device shown on Linux, by “lsusb”.
  2. When insert the usb calbe to the windows, the device manager shows the usb device PID and VID is 0000.
  3. The flash script show :

[ 0.2458 ] Boot Rom communication
[ 0.2467 ] tegrarcm --chip 0x21 --rcm rcm_list_signed.xml
[ 0.2475 ] BootRom is not running
[ 2.4688 ]
[ 2.4689 ] Sending BCTs
[ 2.4714 ] tegrarcm --download bct P2180_A00_LP4_DSC_204Mhz.bct
[ 2.4740 ] USB communication failed.Check if device is in recovery

The question:
Is there any other way to check the recovery mode.

This issue had been fixed.
The root case is the Usb board circuit was something wrong.