我想用到HAL_UART_DMA，我在Options里的Preproce栏目Defined symbols设置HAL_UART=TRUE，编译后出现
Warning[w52]: More than one definition for the byte at address 0x6b in common segment INTVEC. It is defined in module "hal_uart" as well as in module "hal_key"
这是为什么？如果把POWER_SAVING去掉编译就出Warning，现在我想用到HAL_UART_DMA也想开起POWER_SAVING那怎么办？