stm32f103 failed to enable uart

[leeminghao]

boot command:

/home/work/qemu-system-arm -serial tcp::12345,server,nowait -serial tcp::12344,server,nowait -serial stdio -machine pebble-bb2 -cpu cortex-m3 -pflash build-qemu-m3-test/lk.bin

WARNING logs:

CLKTREE: PCLK1 Output Change (SrcClk:HCLK InFreq:16000000 OutFreq:16000000 Mul:1 Div:1 Enabled:1)
CLKTREE: PCLK2 Output Change (SrcClk:HCLK InFreq:16000000 OutFreq:16000000 Mul:1 Div:1 Enabled:1)
qemu stm32: hardware warning: Warning: You are attempting to use the stm32_rcc peripheral while its clock is disabled.
...
qemu stm32: hardware warning: Warning: You are attempting to use the stm32_rcc peripheral while its clock is disabled.

Enable clock codes as following:

void uart_init_early(void)
{
#ifdef ENABLE_UART1
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
#endif
#ifdef ENABLE_UART2
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
#endif
#ifdef ENABLE_UART3
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
#endif

#ifdef ENABLE_UART1
    usart_init1_early(USART1, UART1_FLOWCONTROL, USART1_IRQn);
#endif
#ifdef ENABLE_UART2
    usart_init1_early(USART2, UART2_FLOWCONTROL, USART2_IRQn);
#endif
#ifdef ENABLE_UART3
    usart_init1_early(USART3, UART3_FLOWCONTROL, USART3_IRQn);
#endif
}

I have set ENABLE_UART3=1, it's seem to not enable periph clock