"tc397" is a chip name which is not appropriate to act as a board name.
the board supported here is actually "a2g-tc397-5v-tft".
The correct definition is : tricore is arch name, tc3xx is arch family
name, tc397 is chip name and the borad name is a2g-tc397-5v-tft

Note: Please adhere to Contributing Guidelines.

Summary

Correct the supported tricore tc397 board name

Impact

The supported tricore arch/arch family/chip/board will be clear

Testing

Build OK:
[ 99%] Linking C executable nuttx
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cd /home/lixiang/repos/nuttxspace/output && /home/lixiang/downloads/cmake-3.27.1-linux-x86_64/bin/cmake -E cmake_depends "Unix Makefiles" /home/lixiang/repos/nuttxspace/nuttx /home/lixiang/repos/nuttxspace/nuttx /home/lixiang/repos/nuttxspace/output /home/lixiang/repos/nuttxspace/output /home/lixiang/repos/nuttxspace/output/CMakeFiles/systemmap.dir/DependInfo.cmake "--color="
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Run OK