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主程序在flash中,部分程序memcopy到ram

想请教一下各位前辈:

cmd中

ramfuncs : LOAD = FLASHD,
RUN = progRAM,
LOAD_START(_RamfuncsLoadStart),
LOAD_END(_RamfuncsLoadEnd),
RUN_START(_RamfuncsRunStart),
PAGE = 0

main中

#ifdef FLASH
// Copy time critical code and Flash setup code to RAM
// The RamfuncsLoadStart, RamfuncsLoadEnd, and RamfuncsRunStart
// symbols are created by the linker. Refer to the linker files.
MemCopy(&RamfuncsLoadStart, &RamfuncsLoadEnd, &RamfuncsRunStart);

1把对时间需求重要的程序写入FlashD中,这点首先怎么做到?

2cpu从flash开始启动,他怎么做到从flash中运行中,切换到ram中,又从ram中跑回来的呢?