1.) Can you probe the HW+ / HV+ / HU+ pins with the halls from the motor connected and VREG up? You should not see all the halls logic-high or logic-low at the same time.
With the motor winding connected, below is the screen capture of HW+ / HV+ / HU+.
ch1: HU+
ch2: HV+
ch3: HW+
2.) Without the three motor phases disconnected from your board and the halls powered up from VREG, can you turn the motor with your hand and probe the HW+ / HV+ / HU+ pins? You should see them toggling as you manually turn the motor. You should not see all the halls logic-high or logic-low at the same time.
With the motor winding disconnected, HW+ / HV+ / HU+ stay low when i manually turn the motor
3.) What is the measured logic-high / logic-low voltage for each of the HW+ / HV+ / HU+ pins?
V_HU+ = 0
V_HV+ = 5V
V_HW+ = 5V
4.) What is the voltage measured across R7? This should be approximately 2.5V based on your schematic while VREG is up
2.5V
Note: On the DRV8307EVM i was able to replicate this issue by switching the hall sensor pins (it seems as if there is a sequence that works better.) So, i thought i'd try different hall sensors connections on my board to see if one of them work but none worked.