The document you asking is not available publicly, please open a case to Online Technical Support to get this document.
Note the below public document also contains an information on how to run TST demo on our LS1021ATSN board (see Section 7.2):
https://www.nxp.com/docs/en/user-guide/OPEN-LINUX-IND-UM-1-5.pdf
To enter a case to Online Technical Support please perform the following:
1. Please open www.nxp.com
2. Click "SUPPORT" drop-down menu
3. Click "All support options" in "SUPPORT" drop-down menu
4. Enter your NXP site login/password if necessary.
5. Click "Go to Tickets" in "Support Requests" section
6. The system should redirect you to this page https://nxpcommunity.force.com/community/CommunityContextPage
7. At this page please create a new folder for support cases by clicking "Add a Folder". Typically - one folder per project.
8. When asked, enter project details - design stage, projected annual volume, end application type and application name.
9. When folder is created, please click "Add a new case" button near to folder name to create support case.
