I've had a chat with one of the Summit developers. Here's what I learned:
The X670’s LED activity is updated by software, and not directly by the Broadcom chip like in other EXOS platforms. This software process runs at a period of one second. In each period, it checks if RX and TX counters have changed on each port. Since the counter thread runs at a “slow” period, the LED processor is very likely to see link activity on every port (if any) at every scan. So, it blinks the LEDs at the same time. In summary, this is a hardware limitation on X670 that we are unfortunately unable to do anything about.
There were some changes to the timing and duration of the LED blinking, but it is still the same idea as before. Previously, the scan ran a little faster but still blinked all LEDs at the same time on ports with activity.
