Very easy:
$ arm-none-eabi-readelf -WS nuttx/nuttx | grep .text | awk '{ print "0x"$5 }'
0x08000000
Source: https://copyprogramming.com/howto/gdb-no-symbol-table-is-loaded-code-example
Very easy:
$ arm-none-eabi-readelf -WS nuttx/nuttx | grep .text | awk '{ print "0x"$5 }'
0x08000000
Source: https://copyprogramming.com/howto/gdb-no-symbol-table-is-loaded-code-example