TI DM365 3.0 release,don't find the RS485(ttyS1)

hi jingguang,

do you solve this problem? can you teach me how to solve it? thanks!

i also want to have two serial port. i modify the kernel configuration,and rebuild the kernel, but it does not works. 

bojiang

hi bojiang,

this problem has  be solved;

1) change the configure from "1" to "2"；(In the above picture:  ti-davinci/arch/arm/configs/davinci_dm365_ipnc_defconfig_nand  and  davinci_dm365_ipnc_defconfig_nfs)

then boot the DM365  :  cat /proc/tty/driver/serial 

you can see two serial like this :

0: uart:16550A mmio:0x01D06000 irq:41 membase 0xFBD06000 tx:11064 rx:95 RTS|CTS|DTR|DSR
1: uart:unknown port:00000000 irq:0

2)compare  the file ：board-dm365-ipnc.c between 2.6 and 3.0 ，change：

(1) add UART0 in the struct

static struct plat_serial8250_port serial_platform_data[] = {
     {
         .membase = (char *) IO_ADDRESS(DAVINCI_UART0_BASE),
         .mapbase = (unsigned long) DAVINCI_UART0_BASE,
         .irq = IRQ_UARTINT0,
         .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
         .iotype = UPIO_MEM,
         .regshift = 2,
         .uartclk = 24000000,
     },
     {
         .membase = (char *) IO_ADDRESS(DM365_UART1_BASE),
         .mapbase = (unsigned long) DM365_UART1_BASE,
         .irq = IRQ_UARTINT1,
         .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
         .iotype = UPIO_MEM,
         .regshift = 2,
         .uartclk = 121500000,
     },
     {
         .flags = 0
     },
 };

(2)modify the UART1 init initialization (Because of the add a  UART0)

serial_platform_data[0].uartclk= pll1_commonrate;   =》    serial_platform_data[1].uartclk= pll1_commonrate;

3) modify the console login port from ttyS0 to ttyS1  in the fs.

DM365 : /etc/inittab

2.6：con:2345:respawn:/sbin/getty console

3.0：1:2345:respawn:/sbin/mingetty --autologin root ttyS0  change to   1:2345:respawn:/sbin/mingetty --autologin root console

4) modify the console login port from ttyS0 to ttyS1  in the U-boot.

like this :setenv bootargs 'console=ttyS1,115200n8 ......

that's all

yun

hi yun,

thanks very much!

according to what you said, i have solved this problem.

in addition, i have another question want to ask you. i did "make menuconfig" to configuration the kernel, but the ".config" file did not update. why?

do i must modify "davinci_dm365_ipnc_defconfig_nand" file?

thanks a lot!

bojiang

hi bojiang,

about problem 1: sorry !  i don't kown;

the problem 2: when you build the DM365 , the davinci_dm365_ipnc_defconfig_nand  or davinci_dm365_ipnc_defconfig_nfs will be overlap the davinci_dm365_ipnc_defconfig ,

i guess you boot DM365 in the NFS now,  when you boot it  use the nand , you must be modify  the file :davinci_dm365_ipnc_defconfig_nand

yun

hi yun,

thanks very much!

according to what you said, i have changed.but when i use

open("/dev/tts/0", O_RDWR | O_NOCTTY | O_NDELAY);

it returns -1?

can you help me ?

thanks a lot!

hi ling：

boot the DM365, Run this command ：dmesg | grep tty    or   dmesg | grep tts

say the real name of the UART0 and UART1;

like this :    dmesg | grep tty

serial8250: ttyS0 at I/O 0xf9830000 (irq = 9) is a 16550A........
serial8250: ttyS1 at I/O 0xf9840000 (irq = 10) is a 16550A.............

the right  api  :  open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);    or   open("/dev/ttyS1", O_RDWR | O_NOCTTY | O_NDELAY);

Best Regards,
yun

hi yun,

thanks very much!

i got it ! 

as you say

open("/dev/tts/0", O_RDWR | O_NOCTTY | O_NDELAY);   is wrong.

thanks a lot!

hi yun,

thanks very much!

I have another problem,can you help me?

when i read from /dev/ttyS0 ,it returns 0.

This is my program.

int OpenTrigCtrlPort()
{
 struct termios options;
 
 fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NONBLOCK);
 if (fd < 0){
      printf("error");
  return -1;
 }

 bzero(&options,sizeof(options));
 /*raw output mode*/
 options.c_oflag = 0;
 /*raw input mode*/
 options.c_iflag = 0;

 options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); 
 options.c_cflag = B9600|CRTSCTS|CS8|CLOCAL|CREAD;
 tcflush(fd,TCIFLUSH);
 tcsetattr(fd, TCSANOW, &options);

 return 1;
}

int *TransCtrlThread(void *arg)
{
 int nread;
 char buff[1000];

 memset(buff, 0, 1000);

 while (1)
 {
  nread = read(fd, buff, 80);
  printf("nread = %d\n", nread);

  if (nread > 0)
  {

   buff[nread+1] = '\0';
   printf("buff = %s\n", buff);
  }

  sleep(30);

 }

 close(fd);

 printf("Thread exit\n");
 return 0;
}

thanks a lot!