嵌入式:memcpy/memset没有被大多数CRT启动代码使用-为什么?

Context:
I'm working on an ARM target, more specifically a Cortex-M4F microcontroller from ST. When working on such platforms (microcontrollers in general), there's obviously no OS; in order to get a working C/C++ "environment" (moreover, to be standard compliant in regard to initialization of variables) there must be some kind of startup code run at reset that does the minimum setup required before explicitly calling I'm working on an ARM target, more sp