RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ aa49ca9db38bdb623d69b050c807dbeb2d99ed24

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bernard.xiong@gmail.com 1c56553b04 Add BAUD_RATE_4800 definition.		13 lat temu
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drivers	1c56553b04 Add BAUD_RATE_4800 definition.	13 lat temu
rtdevice.h	db58e3350b add serial DMA transmit function(beta)	13 lat temu