NuMaker SPI flash-backed file system

Revision:
1:772d0adf75cc
Child:
2:38eaf322b428
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Thu Jan 11 14:39:17 2018 +0800
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#eca67ca7dafab4ef70c21e2463b541132d0dd691