RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ bfc473ebee729b804721134223b104f50f38fa36

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gary.li.wenchao.4 3c6a9775a2 remove clk_init and sdram_init		16 anni fa
..
arm	3c6a9775a2 remove clk_init and sdram_init	16 anni fa
ia32	4e399f6e90 fix bug in rt_hw_context_swicth	16 anni fa
SConscript	237b400982 added lowlevel_init.S for startup code	16 anni fa