Fix error when RS232 not enabled
tree226c9aa2c15e4aab2794d3e3f29d460e4f12e6c4
-rw-r--r-- 6617 Makefile.include
-rw-r--r-- 1778 README
-rw-r--r-- 4738 README-BUILDING
-rw-r--r-- 6355 README-EXAMPLES
drwxr-xr-x - apps
drwxr-xr-x - backyard
drwxr-xr-x - core
drwxr-xr-x - cpu
drwxr-xr-x - doc
drwxr-xr-x - examples
drwxr-xr-x - platform
drwxr-xr-x - tools