NuMaker bootloader with SD mode

Revision:
1:659cc7618f73
Child:
3:3f3c7e764947
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.hgignore	Tue Dec 26 11:08:40 2017 +0800
@@ -0,0 +1,5 @@
+.build
+.mbed
+projectfiles
+mbed-os
+BUILD
\ No newline at end of file