https://blog.csdn.net/libing403/article/details/72912445
看说明，支持POSIX接口，方便移植Linux第三方程序
另外，支持多核CPU，也就是说可以把多核A核SOC跑起来。
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RTEMS is free software; you can redistribute it and/or modify it under terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. RTEMS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with RTEMS; see file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
As a special exception, including RTEMS header files in a file, instantiating RTEMS generics or templates, or linking other files with RTEMS objects to produce an executable application, does not by itself cause the resulting executable application to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU Public License.
最后一个exception好像是说如果只是用它，引用头文件或者链接它生成可执行文件，不需要整个application也变成GPL。这个好呀，几乎就是可以商用闭源了，大不了只需要开源修改的RTEMS部分代码，应用代码不需要开源
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