Alternative UART1 on DM365

Yes, UART1 can be used with EMAC configuring the pinmuxing of the alternate pins, as you've done. Also check the .uartclk setting for UART1 in board-dm365-evm.c

Another detail: SPI0 power domain must be disabled.

Dear Marco:

Thanks for your info.

I think .uartclk has been set in board-dm365-evm.c already.

Does it need any additional change?

Is the SPI0 power domain used for GPIO25?

I shut it down in by removing

davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, 0,
            DAVINCI_DM365_LPSC_SPI0, 1);

in board-dm365-evm.c.

But I am not sure if it is correct.

Best regards,

Ray

Ray,

1) please check that the .uartclk is correct for your board, because uart1 uses a different clock divider than uart0. Default value is 24Mhz, but it might not be correct. PLL and divider is set in the first bootloader (UBL). Default 24Mhz was an incorrect setting for our board.

2) Add the entry for alternate pinmuxing:

MUX_CFG("UART1_RXD2",           4,   14,    3,    3,     0)
MUX_CFG("UART1_TXD2",           3,   29,    3,   3,      0)

Marco,

I too was trying to bring up the UART1 up in my board. Definitely would not have solved it without your above post.

Thank you

Aravind

Marco

I have one more issue. Can you also post the steps that are suppose to be done to bring up the UART1 at the u-boot level.

I did the following changes on the u-boot. But the uboot stopped in the middle and I dont see any more logs after "Err:Serial".

Below is the terminal log for your reference.

Changes made to  Davinci_dm365_evm.h

#define CONFIG_SYS_NS16550_COM1 0x01D06000 /* Base address of UART0 */
#define CONFIG_SYS_NS16550_CLK  135000000 /* Input clock to NS16550 */

Terminal Log:

U-Boot 2009.03 (Apr 10 2010 - 21:15:42)

I2C:   ready
DRAM:  128 MB
NAND:  NAND device: Manufacturer ID: 0x2c, Chip ID: 0xdc (Micron NAND 512MiB 3,3
V 8-bit)
Bad block table found at page 262080, version 0x01
Bad block table found at page 262016, version 0x01
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xdc (Micron NAND 512MiB 3,3V 8-bit
)
Bad block table found at page 262080, version 0x01
Bad block table found at page 262016, version 0x01
1024 MiB
In:    serial
Out:   serial
Err:   serial

Please suggest if anything more needs to be done.

Dear Macro:

We have tested two boards: DM365EVM and another 365 board made by ourselves.

We tested B19 pin (SPI4_SDO) of J10 connector on DM365EVM with a GPS module

and run a small reciving program on DM365EVM. But it can not get any data from UART1.

The same program is running well on X86, dm355, dm6467 and OMAP3530.

We measured the GPS serial output signal with a oscilloscope.

The GPS module is working well.

We also tested our own DM365 board which has GPIO34 and GPIO25.

The same experiment was conducted, but it failed, too.

Another  C program sending data to UART1 was also executed on DM365 board,

but we still also can not find any output signal on the TX pin with oscilloscope.

We haven't modified U-boot settings. The next thing we will do is to modify U-boot.

Hope the U-boot modification will fix this problem.

Your further comment will be welcomed.

best regards,

Ray

Ray

There are two points that need to be noted in case you want UART1 in Uboot.

1. Check if you have defined the macro "CONFIG_MISC_INIT_R" in the file "Davinci_dm365_evm.h"

2. If the above macro is define then the following changes shoudl be made in misc_init_r() function of dm365_evm.c file

This following statements in this function removes all the GPIO configuration done for UART1 on PINMUX3.

 REG(0x01c4000c) = 0x1affff;
  
 REG(0x01c67010) &= 0xFFF80000;

 for (i = 0; i < 20; i++)
 {
  REG(0x01c67014) &= 0xffefffff;
  udelay(1000);
  REG(0x01c67014) |= 0x00100000;
 }
 REG(0x01c4000c) |= 0x01400000;

so to get the UART1 working the corresponding bits on PINMUX3 needs to be set. One suggesstion is set the GPIO pins back to UART1 configuration after this block.

Example :  REG(0x01c4000c) |= 0xF75AFFFF;

Also please note that the respective values of the below macros shoud have been proper define in "Davinci_dm365_evm.h"

#define CONFIG_SYS_NS16550_COM1 0x01D06000 /* Base address of UART1 */
#define CONFIG_SYS_NS16550_CLK  135000000 /* Input clock to NS16550 */
#define CONFIG_CONS_INDEX 1  /* use UART1 for console */
#define CONFIG_BAUDRATE  115200  /* Default baud rate */

Regards

Aravind

Hi, Ray! we meet the same problem. How did you solve this problem a last! Thank you!

http://bbs.21ic.com/icview-516418-1-1.html

same problem here. i am using kernel 2.6.32.17 from DVSDK 4.

have modified in dm365.c:

MUX_CFG(DM365, UART1_TXD, 3,   29,    3,    3,  false)   // GPIO 25 : UART1_TXD
MUX_CFG(DM365, UART1_RXD, 4,   14,    3,    3,  false)     // GPIO 34 : UART1_RXD

and added in serial.c:

    davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, 0, DAVINCI_LPSC_SPI, 0);

    davinci_cfg_reg(DM365_UART1_TXD);
    davinci_cfg_reg(DM365_UART1_RXD);

corrected the uart1 base address in serial.h:

#define DAVINCI_DM36X_UART1_BASE    (IO_PHYS + 0x106000) //01d0 6000

clock i think no need to modify because uart1 clock is defined in dm365.c already:

static struct clk uart1_clk = {
    .name        = "uart1",
    .parent        = &pll1_sysclk4,
    .lpsc        = DAVINCI_LPSC_UART1,
};

if i run cat /proc/interrupts, the output is:

           CPU0
  0:     738243       AINTC  vpfe_capture0
  3:          0       AINTC  dm365_h3a_af
  5:     738246       AINTC  Imp_Sdram_Irq
  6:     738390       AINTC  dm365_h3a_aew
  8:    1443190       AINTC  davinci_osd
 12:          0       AINTC  musb_hdrc
 16:         46       AINTC  edma
 17:          0       AINTC  edma_error
 23:          0       AINTC  sdio0
 26:          8       AINTC  mmc0
 29:          0       AINTC  davinci_rtc
 32:    1543843       AINTC  clockevent
 33:        134       AINTC  free-run counter
 39:        517       AINTC  i2c_davinci
 40:        989       AINTC  serial
 52:          0       AINTC  eth0
 53:     215976       AINTC  eth0
 54:       4474       AINTC  eth0
 55:          0       AINTC  eth0
 60:          0       AINTC  davinci_keyscan
Err:          0

if i run cat /proc/tty/driver/serial, it shows:

serinfo:1.0 driver revision:
0: uart:16550A mmio:0x01C20000 irq:40 tx:10255 rx:264 RTS|CTS|DTR|DSR
1: uart:16550A mmio:0x01D06000 irq:41 tx:77 rx:1 brk:1 RTS|CTS|DTR|DSR

however when i run echo "1111111111111111" > /dev/ttyS0, nothing measured from GIO25 and GIO34. the default is 9600 baudrate. but if i changed to 115200. same.

sorry i mean echo "1111111111111111" > /dev/ttyS1

would very much like to know if anyone has ever got uart1 working...

like to continue try but if no one got it working then i would probably give up.