Modified stuff:
build_scripts/config/bsp
BUSYBOX_FS_EXT4_SIZE set to 1000 in order to hold Linux LTP stuff in busybox initramfs
(indirect)
build_scripts/config/busybox/initramfs.files.d/
Added (automatically, as part of rebuild_me.sh) ltp install files into it, so they'll be present after booting busybox
build-scripts/build-linux.sh
Added following configuration entry: #Andrew new --enable FTRACE