Can't open uart in uClinux with MMU

Hi,

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I don't get it, why I need /dev/ttyS2 and S3?

I have 3 uart in my system, but it only show 2.

And I can't open (ttyS0 and ttyS1) in software.

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Please check that your UART names are well-defined in the file 'nios2-linux/linux-2.6/arch/nios2/kernel/config.c', and if not, please modify it. In default, those must be 'UART0. 'UART1', 'UART2' and 'UART3'.

/*
 *    Altera UART
 */
static struct altera_uart_platform_uart nios2_uart_platform = {# if defined(UART0_BASE) || defined(UART_BASE)
 # ifdef UART0_BASE
    {
     .mapbase = UART0_BASE,
     .irq = UART0_IRQ,
     .uartclk = UART0_FREQ,
     },
 # else
    {
     .mapbase = UART_BASE,
     .irq = UART_IRQ,
     .uartclk = UART_FREQ,
     },
 # endif# endif# ifdef UART1_BASE
    {
     .mapbase = UART1_BASE,
     .irq = UART1_IRQ,
     .uartclk = UART1_FREQ,
     },# endif# ifdef UART2_BASE
    {
     .mapbase = UART2_BASE,
     .irq = UART2_IRQ,
     .uartclk = UART2_FREQ,
     },# endif# ifdef UART3_BASE
    {
     .mapbase = UART3_BASE,
     .irq = UART3_IRQ,
     .uartclk = UART3_FREQ,
     },# endif
    {},
};

And UART devices are probed in the function 'altera_uart_probe' of the file 'nios2-linux/linux-2.6/drivers/serial/altuart.c'.

static int __devinit altera_uart_probe(struct platform_device *pdev)
{
    struct altera_uart_platform_uart *platp = pdev->dev.platform_data;
    struct uart_port *port;
    int i;
    for (i = 0;
         ((i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS) && (platp.mapbase));
         i++) {
        port = &altera_uart_ports.port;
        port->line = i;
        port->type = PORT_ALTERA_UART;
        port->mapbase = platp.mapbase;
        port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
        port->iotype = SERIAL_IO_MEM;
        port->irq = platp.irq;
        port->uartclk = platp.uartclk;
        port->ops = &altera_uart_ops;
        port->flags = ASYNC_BOOT_AUTOCONF;
        uart_add_one_port(&altera_uart_driver, port);
    }
    return 0;
}

Please debug it by 'printk', if necessry. Anyway you must distinguish your UART devices by major and minor numbers, so you need /dev/ttyS2 and /dev/ttyS3 after your 4 UARTs are probed successfully.

Kazu