u-boot <tag_name> what is it?

Hi im trying to build u-boot but im in the step where it says
cd <your_L4T_root>/Linux_for_Tegra ./source_sync.sh –u <TAG_NAME>
but i cant find it anywhere.
I tried
git tag -l tegra-l4t*
but i get
fatal: Not a git repository (or any of the parent directories): .git
Could some one please tel me the tag name?
Thanks in advance

According to the Release notes it’s “tegra-l4t-r19.3”.

If you sync the sources without the tag name you should get kernel and bootloader sources in their subdirectories and in those you can run the “git tag -l” command.

thanks alot, I was very confused looking in the wrong place entirely