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Forum Post: RE: AM335X: Procedure for gaining access to boundary scan

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BeagleBone Black connects TRSTn to GND via 4.7K resistor, and thus keep TRSTn normally low.

My JTAG controller don't have TRSTn pin, so I connect BeagleBone Black TRSTn line directly to 3.3V VDD.

After powering up BeagleBone Black, I saw keep-alive LEDs flashing

I run my JTAG test controller few times, The TDO pin still get all 1's, even though I drive some user LED pins (gpmc_5 - gpmc_8, V15, ... V16) to 0. 


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