直接编译k2的PCIe的例程,然后出现了如图的错误,提示有些与serdes有关的变量不能识别,未定义,但是pdk路径已经设置好了!同时在《KeyStone_2_Self_Test_Kit_User's_Guide (READ ME FIRST)》"For some registers not defined in CSL, such as PLL and Serdes, the STK defines the SHIFT/MASK macros in the style of CSL.",那么与serdes有关的变量在哪里定义?怎么修改错误?