TYBLE16 will become mbed chip! You can compile as a BBC micro:bit on the mbed (not mbed-os5).

Dependencies:   TextLCD mbed

Please see follows.
/users/kenjiArai/notebook/tyble16-module-will-become-a-mbed-family--mbedliza/#

Revision:
0:64039a43c2e1
diff -r 000000000000 -r 64039a43c2e1 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sun Oct 29 03:46:59 2017 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/fb8e0ae1cceb
\ No newline at end of file