I don't know of a way to debug the PRU.
I'd start with a very simple C program.
You can start with setting the interrupt telling the loader the program is
halting.
Next, enable the OCP, then go into a tight loop toggling a pin.
// Enable OCP master ports - this enables pinmux pins to R30 & R31 & host
ram access (all the BBB GPIO ports & such)
CT_CFG.SYSCFG_bit.STANDBY_INIT = 0;
That should let you know the PRU is loaded and running and it is able to access
pins.
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