I.mx6 Quad how to set uboot Baud rate

[fatalfeel]

I set the command line bootargs

the kernel I set 460800 works fine

console=ttymxc0,460800

but uboot is failed can not work at 460800

Which File need change or what command need change

by the way bootable\bootloader\uboot-imx\drivers\serial\serial.c

CONFIG_SYS_BAUDRATE_TABLE

which file define this?

[fatalfeel]

static void mxc_serial_setbrg(void)

{

    u32 clk = imx_get_uartclk();

    //if (!gd->baudrate) //by stone   need mark here

    printf("old baudrate=%d, new baudrate=%d \n", gd->baudrate, CONFIG_BAUDRATE);

    gd->baudrate = CONFIG_BAUDRATE;

    __REG(UART_PHYS + UFCR) = 4 << 7; /* divide input clock by 2 */

    __REG(UART_PHYS + UBIR) = 0xf;

    __REG(UART_PHYS + UBMR) = clk / (2 * gd->baudrate);

}

[fabio_estevam]

You can send this command in U-boot prompt:

setenv baudrate 460800

Regards,

Fabio Estevam

[fatalfeel · Accepted solution]

great info

i use openocd eclipse and set ur command

trace to /bootloader/uboot-imx/include/config_fallbacks.h

this file define it~

#define CONFIG_BAUDRATE

115200

#define CONFIG_SYS_BAUDRATE_TABLE  \

{300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200}

Programming Guide: BaudRate setting for u-boot and kernel on i.mx6

[igorpadykov]

Hi jesse

baudrate is set in uboot board configuration file like:

include/configs/mx6sabre_common.h   #define CONFIG_BAUDRATE 115200

Best regards

igor

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[fatalfeel]

But i want this define~~~
CONFIG_SYS_BAUDRATE_TABLE