RT-Thread nano pack中board.c配置错误怎么办

nano的MDK移植

board.c 中rt_hw_board_init（）报错
#error "TODO 1: OS Tick Configuration."

void rt_hw_board_init(void)
{
/*

• TODO 1: OS Tick Configuration
• Enable the hardware timer and call the rt_os_tick_callback function
• periodically with the frequency RT_TICK_PER_SECOND.
  /
  / 1、系统、时钟初始化 /
  HAL_Init(); // 初始化 HAL 库 ** waring：is invalid in c99*
  SystemClock_Config(); // 配置系统时钟 waring：is invalid in c99
  SystemCoreClockUpdate(); // 对系统时钟进行更新 waring：is invalid in c99
  /* 2、OS Tick 频率配置，RT_TICK_PER_SECOND = 1000 表示 1ms 触发一次中断 /
  SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND); ** SystemCoreClock不能识别*
  /* Call components board initial (use INIT_BOARD_EXPORT()) */
  #ifdef RT_USING_COMPONENTS_INIT
  rt_components_board_init();
  #endif
  #if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
  rt_system_heap_init(rt_heap_begin_get(), rt_heap_end_get());
  #endif
  }