I tested UART of i.MX6SX then I found UART clock switched from OSC to PLL3 during boot up of linux.
It caused error/unexpected data feeding on UART which assigned to Cortex-M4 in our case.
Why UART clock changed from OSC @uboot to PLL3 @linux?
Is there any way to supply PLL3 clock to UART from the beginning?
Can anyone help me?