Hi NXP Team,
We have started working on I.MX8MQ couple of months back and at that time the Yocto BSP version was L5.4.3_1. 0.0.
Please confirm that this kernel version 5.4.3 is LTS by NXP team.
The L5.4.3 is a BSP from NXP, all BSP from NXP are LTS, but right now we are in L5.4.24 you might check:
i.MX 8M Mini Evaluation Kit | NXP