RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ 7261c7460cbf293d022b54e2a02bf2aefaeea00a

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Xue Liu 65f1d8f409 Enable Heap for nRF51822		10 lat temu
..
SConscript	3dc20907c3 add nrf51822 to bsp	10 lat temu
board.c	3dc20907c3 add nrf51822 to bsp	10 lat temu
board.h	65f1d8f409 Enable Heap for nRF51822	10 lat temu
uart.c	3dc20907c3 add nrf51822 to bsp	10 lat temu
uart.h	3dc20907c3 add nrf51822 to bsp	10 lat temu