On Thu, 21 Jan 2016 12:36:47 +0300
Antony Pavlov <antonynpavlov@xxxxxxxxx> wrote:
A thousand apologies!
It looks like there is no uart clk issue at all.
I have to use "console=ttyS0,115200" instead of just "console=ttyS0" in kernel cmdline
to make console works.
> Hi!
>
> I have tried to run linux on TP-LINK WR1043ND v1.8.
>
> I use branch master from git://git.linux-mips.org/pub/scm/ralf/linux
>
> I see a problem with UART speed setup. There is no UART output after
> serial port initialization. Here is the last correct linux output:
>
> Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
> console [ttyS0] disabled
> 18020000.uart: ttyS0 at MMIO 0x18020000 (irq = 11, base_baud = 12500000) is a 8250
>
>
> I can disable UART speed setup in 8250 driver:
>
> --- a/drivers/tty/serial/8250/8250_port.c
> +++ b/drivers/tty/serial/8250/8250_port.c
> @@ -2208,6 +2208,8 @@ static void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
> {
> struct uart_8250_port *up = up_to_u8250p(port);
>
> + return;
> +
> /* Workaround to enable 115200 baud on OMAP1510 internal ports */
> if (is_omap1510_8250(up)) {
> if (baud == 115200) {
>
> With this very very dirty hack linux works fine.
>
> I suppose there is a problem in arch/mips/ath79/clock.c
>
> I have tryed to cherry-pick your 'MIPS: ath79: Fix the ar913x reference clock rate'
> and 'MIPS: ath79: Fix the ar724x clock calculation' commits from
> your github ath79 branch at https://github.com/AlbanBedel/linux/tree/ath79
> but these patches don't help me.
>
> Could you please try to reproduce the problem?
>
> --
> Best regards,
> Antony Pavlov
--
--
Best regards,
Antony Pavlov
