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ld combines a number of object and archive files, relocates their data and ties up symbol references. Usually the last step in compiling a program is to run ld. ld accepts Linker Command Language files written in a superset of AT&T’s Link Editor Command Language syntax, to provide explicit and total control over the linking process. This version of ld uses the general purpose BFD libraries to operate on object files. This allows ld to read, combine, and write object files in many different forma

jlink封装烧写工具，抛转引用，其他科根据次修改。

使用手册

centos gcc-arm-none-eabi

1、操作系统freertos 2、文件系统 fatfs。 3、存储介质 SDRAM。 4、以太网 LWIP + LAN8741 5、TCP server 服务。 echo 6、TFTP服务器。

计算串口发送数据所需要的时间

u-boot-2021.04