kgdb调试内核需提供内核串口读写函数

wangjun110

请问一下，用kgdb调试内核，要求串口驱动提供读写串口函数。
void    (*poll_put_char)(struct uart_port *, unsigned char);
int        (*poll_get_char)(struct uart_port *);

imx6ull里会写。在157里怎么写呢？一直通信不成功。

wangjun110

static const struct uart_ops stm32_uart_ops = {
    .tx_empty   = stm32_usart_tx_empty,
    .set_mctrl  = stm32_usart_set_mctrl,
    .get_mctrl  = stm32_usart_get_mctrl,
    .stop_tx    = stm32_usart_stop_tx,
    .start_tx   = stm32_usart_start_tx,
    .throttle   = stm32_usart_throttle,
    .unthrottle = stm32_usart_unthrottle,
    .stop_rx    = stm32_usart_stop_rx,
    .break_ctl  = stm32_usart_break_ctl,
    .startup    = stm32_usart_startup,
    .shutdown   = stm32_usart_shutdown,
    .flush_buffer   = stm32_usart_flush_buffer,
    .set_termios    = stm32_usart_set_termios,
    .pm     = stm32_usart_pm,
    .type       = stm32_usart_type,
    .release_port   = stm32_usart_release_port,
    .request_port   = stm32_usart_request_port,
    .config_port    = stm32_usart_config_port,
    .verify_port    = stm32_usart_verify_port,
   
#ifdef CONFIG_CONSOLE_POLL //添加串口读写函数
    void    (*poll_put_char)(struct uart_port *, unsigned char);
    int     (*poll_get_char)(struct uart_port *);
#endif  
};
   
//串口发送
static void stm32mp157_poll_put_char(struct uart_port *, unsigned char c)
{
    struct stm32_port *stm32_port = to_stm32_port(port);
    struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
   
    while (!(readl_relaxed(port->membase + ofs->isr) & USART_SR_TXE))//等待发送完成
    writel_relaxed(ch, port->membase + ofs->tdr);
}
   
//串口接收
static int stm32mp157_poll_put_char(struct uart_port *)
{
    struct stm32_port *stm32_port = to_stm32_port(port);
    struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
    unsigned long c;
   
   
    if(readl_relaxed(port->membase + ofs->isr)& USART_SR_RXNE))
    {
        c = readl_relaxed(port->membase + ofs->rdr);
        c &= stm32_port->rdr_mask;
    }
    return c;
}
   
kgdb串口连接时监控串口有数据发送，但一直接收不到串口的数据。这个问题卡几天了，求救。