Hi Jerry,
When saying JP 4.6, it is actually JP 4.6.3 (L4T 32.7.3).
From this post Jetson TX2 bpmp uart console - #6 by Bibek , it looks like I don’t have access to bpmp debug right now, since all my boards are production fused. So bpmp debug is not available.
I will have to wait some days to get another brand new TX2 NX board for clock boost check. But in the mean time, if you have any other ideas, please let me know.