make LINUX_MODULES=y fails due to insufficient space for the root FS. Therefore increase the default size from 384 to 640M. With that the available space is 35.5M:
# df -h /
Filesystem Size Used Available Use% Mounted on
/dev/root 629.5M 562.0M 35.5M 94% /
make LINUX_MODULES=y fails due to insufficient space for the root FS. Therefore increase the default size from 384 to 640M. With that the available space is 35.5M: