From which linux kernel was fsimx6-B2024.04.tar.bz2 forked

Hello,

I thought the the linux kernel in the fsimx6-B2024.04.tar.bz2 was forked from a nxp linux kernel (https://github.com/nxp-imx/linux-imx). But i saw the in the fsimx6 bsp the linux kernel version is 5.1.5.148 but the latest nxp linux kernel version was 5.15.71, so this can't be true.

So my question: Where was this kernel forked from?, from which tag?, from which commit?

Thank you very much in advance.

Greetings,

André Wagner