Hi,
I have reported a bug in SDK a long time ago.
https://community.nxp.com/thread/482262
The new SDK 2.5 is released.
Test condition:
I am using UART0 clocked at FRG0.
Does it work? Yes, if I change CLOCK_GetFRG0ClkFreq() to 30000000U.
I should switch to ST.