Problem with UART1 Transmit on DM6467

Another customer had a smiliar issue a while back and it turned out to be the MDR1 register setting was incorrect.  Can you check this register to ensure it is set appropriately?

Thank you very much for your advice,uart1 is enable after the MDR1 has been setted,but it can not be send but received, I have tryed many methods to settle this question,like setting the uart1 register and checking the rx/tx pin multiplexing,but the question still can not be settled.Have you ever come up this this question?What can I do? Thanks.

Hi,

I got the same problem with UART1 transmitt !!

Is there any solution for this?

 where to modify the MDR1 register ? which file? which function?

Thanks,

Tai Chang

The uart1/uart2 are disabled in default,they are enable after setting MDR1.MODE_SELECT. Please read the file named  "TMS320DM646x DMSoC Universal Asynchronous Receiver/Transmitter (UART)" to find out MDR1 register addr and function.

download:

http://focus.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=spruer6d&fileType=pdf

Hi Sephrioth ,

Thanks for reply,

I found the MDR1 in p71 of datasheet, but I can not figure out the Offset Address (hex): 8h x S mean.

What is the "8-bit aligned addresses" mean in page 38 ??

 Update:

I find the piece code on internet and add below in board_init()

 ptr_ier          = (volatile int *)IO_ADDRESS(DAVINCI_UART1_BASE+0x4);
 *ptr_ier         = 0x0; //disable int
 
 ptr_pgmgt = (volatile int *) IO_ADDRESS(DAVINCI_UART1_BASE+0x20); //Mode Definition Register 1 (MDR1)
 *ptr_pgmgt = 0x00; ////set to UART 16x mode.

 ptr_ier          = (volatile int *)IO_ADDRESS(DM644X_UART2_BASE+0x4);
 *ptr_ier         = 0x0; //disable int
 
 ptr_pgmgt = (volatile int *) IO_ADDRESS(DM644X_UART2_BASE+0x20);
 *ptr_pgmgt = 0x00;

BUT, still with errors:

root@10.32.62.100:~# cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:ST16654 port:00000000 irq:40 tx:1882 rx:34 RTS|CTS|DTR
1: uart:ST16654 port:00000000 irq:41 tx:0 rx:0 DSR
2: uart:ST16654 port:00000000 irq:42 tx:0 rx:0 DSR
root@10.32.62.100:~#
root@10.32.62.100:~# echo a5 > /dev/tts/1
serial8250: too much work for irq41     [:'(]
root@10.32.62.100:~#

Thanks

Tai

Hi Chang, It seems the uart1 haven't been enabled,I get the same result just as  you did. You can put your code into the function named "serial8250_startup" in the file of "/driver/serial/8250.c".

I am sorry that I don't know what does "8-bit aligned addresses"mean, anybody knows？[:P]

I have tryed many ways to set uart1, but it still can not be send but received.
Have anyone ever come up this problem?

Hi Sephrioth ,

when I execute ↓

root@10.32.62.100:~# echo a5 > /dev/tts/1
serial8250: too much work for irq41

The console stop here .... do we have the same symptom?

Then I execute  ↓

root@10.32.62.100:~# cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:ST16654 port:00000000 irq:40 tx:6437 rx:148 RTS|CTS|DTR
1: uart:ST16650V2 port:00000000 irq:41 tx:4 rx:0 DSR
2: uart:ST16650V2 port:00000000 irq:42 tx:0 rx:0 DSR

The UART1 tx port sent 4 bytes data out..is it right?

Tai

Yes, I got the same problem in the beginning.

 Add the code in "serial8250_startup" your problem can be solved:

    if(up->port.type == PORT_16650V2)
    {
        unsigned int tmp;
        tmp = readl(up->port.membase+(8 * 4));
        tmp &= ~(0x7);
        writel(tmp,(up->port.membase+(8 * 4)));
    }

Hi,

Do you modify the "board_init()" in file "board-dm6467-evm.c" ?

I add the code you gave in "serial8250_startup()", but the "up->port.type" is always "ST16654"  during boot up.

I "echo a6 > /dev/tts/1" then the "serial8250_startup()"  will be called once and execute the code you gave to me.

BUT that still have the same error "serial8250: too much work for irq41" !!!!!

what happen ?   [:'(]

I just modify the function named "serial8250_startup", what is your montavista kernel version?

linux-2.6.10_mvl401_LSP_01_30_00_082

 Add the code in "serial8250_startup" your problem can be solved:

    if(up->port.type == PORT_16650V2)
    {
        unsigned int tmp;
        tmp = readl(up->port.membase+(8 * 4));
        tmp &= ~(0x7);
        writel(tmp,(up->port.membase+(8 * 4)));
    }

I do as the above ,and now I can only receive the data as you said before. Have you solved this problem?

DAVINCI-WDT: DaVinci Watchdog Timer: heartbeat 60 sec
Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled
serial8250.0: ttyS0 at MMIO map 0x1c20000 mem 0xfbc20000 (irq = 40) is a ST16654
serial8250.0: ttyS1 at MMIO map 0x1c20400 mem 0xfbc20400 (irq = 41) is a ST16650V2
serial8250 serial8250.0: unable to register port at index 2 (IO0 MEM80000 IRQ262144): -22
serial8250 serial8250.0: unable to register port at index 3 (IO4 MEM2000bfff IRQ-1070044028): -28
serial8250 serial8250.0: unable to register port at index 4 (IOc06a7f80 MEM420807ff IRQ-1070044028): -28

Why IRQ is negative number?

Hi,

Does anyone can send data through UART1 of DM6467?

I still can't solve it.

This will only work if PINMUX1 is configured correctly (i.e. disable TSIF).  Then do the following.

Using MVL 5.0, in the file board-dm6467-evm.c:

- in the function board_init, add

  davinci_psc_config(DAVINCI_DPSC_ARMDOMAIN, DAVINCI_DM646X_LPSC_UART1);

- in the function dm646x_setup_pinmux, add

  case DAVINCI_DM646X_LPSC_UART1:

    /* power up UART1 data */

    val = davinci_readl(DAVINCI_VDD3P3V_PWDN);

    davinci_writel(val & 0xFFFFFFBF, DAVINCI_VDD3P3V_PWDN);

    /* select UART 16x  mode */

    val = davinci_readl(DAVINCI_UART1_BASE + 0x20);

    davinci_writel(val & 0xFFFFFFF8, DAVINCI_UART1_BASE + 0x20);

    /* generate THR interrupt */

    val = davinci_readl(DAVINCI_UART_BASE + 0x40);

    davinci_write(val | 0x00000008, DAVINCI_UART_BASE + 0x40);

    break;