Tool/software:
On customer's board/system, there is rare case the UART baud rate increased from 115200bps to ~150Kbps, other peripherals like CAN, Ethernet still work, but USB, timer which share the same 48MHz clock are impacted. it need reset AM335x to recover.
The system use 25MHz crystal as clock. after the issue happen, the input clock is still stable at 25MHz.
Customer asks if there is noise on the clock, or the clock is not stable during run time, will it result in PLL output clock frequency change and stay on the changed frequency can't recover?
Does the PLL lock multiples or lock the output frequency?
Is there way to detect the PLL output abnormality? then software can involve to reset the device.