On Tue, Oct 25, 2022 at 1:37 PM Fabio Estevam <feste...@denx.de> wrote:
>
> Hi Pali,
>
> On 25/10/2022 17:23, Pali Rohár wrote:
>
> > Hello! I do not have any MXC hardware but I see there one issue.
> > mxc_serial_putc() function probably should not return -EAGAIN when
> > device is busy. But instead it should wait until it is ready.
> >
> > Could you try to change code to following?
> >
> > while (readl(&uart->ts) & UTS_TXFULL)
> > ;
> >
> > writel(ch, &uart->txd);
>
> Your analysis looks correct.
>
> The kernel does like this:
>
> static void imx_uart_console_putchar(struct uart_port *port, unsigned
> char ch)
> {
> struct imx_port *sport = (struct imx_port *)port;
>
> while (imx_uart_readl(sport, imx_uart_uts_reg(sport)) & UTS_TXFULL)
> barrier();
>
> imx_uart_writel(sport, ch, URTX0);
> }
>
> Thanks
Fabio and Pali,
Seems reasonable but this does not resolve the problem. Whatever I
print in board_init gets cutoff by the print from dm_announce.
Tim
