imx6 修改uart以及遇到的问题

MX6X:

CSI0_DAT10  ---->UART1_TXD
CSI0_DAT11  ----> UART1_RXD

UART modification in uboot

File: R13.2\uboot-imx\include\configs\mx6q_arm2.h
（注意：不同的板子对应不同的型号）
From

#define CONFIG_MXC_UART
#define CONFIG_UART_BASE_ADDR   UART4_BASE_ADDR

To

#define CONFIG_MXC_UART
#define CONFIG_UART_BASE_ADDR   UART1_BASE_ADDR

File:R13.2\uboot-imx\board\freescale\mx6q_arm2\mx6q_arm2.c
（注意：通常这个地方需要改的，查看对应手册看io口）

From

/* UART4 TXD */
mxc_iomux_v3_setup_pad(MX6Q_PAD_KEY_COL0__UART4_TXD);
/* UART4 RXD */
mxc_iomux_v3_setup_pad(MX6Q_PAD_KEY_ROW0__UART4_RXD);

To

/* UART1 TXD */
mxc_iomux_v3_setup_pad(MX6Q_PAD_CSI0_DAT10__UART1_TXD);
/* UART1 RXD */ 
mxc_iomux_v3_setup_pad(MX6Q_PAD_CSI0_DAT11__UART1_RXD);

---

UART modification in Kernel

File: R13.2\kernel_imx\arch\arm\mach-mx6\board-mx6q_arm2.h
（注意：通常这个地方是需要改的，查看对应的手册看io口）
Form

/* UART4 for debug */
MX6Q_PAD_KEY_COL0__UART4_TXD,
MX6Q_PAD_KEY_ROW0__UART4_RXD,

To

/* UART1 for debug */
MX6Q_PAD_CSI0_DAT10__UART1_TXD,
MX6Q_PAD_CSI0_DAT11__UART1_RXD,

File: R13.2\kernel_imx\arch\arm\mach-mx6\board-mx6q_arm2.c
From

static inline void mx6_arm2_init_uart(void)
{
    imx6q_add_imx_uart(3, NULL);
    imx6q_add_imx_uart(1, &mx6_arm2_uart1_data);
}

To

static inline void mx6_arm2_init_uart(void)
{
    imx6q_add_imx_uart(0, NULL);
    imx6q_add_imx_uart(1, &mx6_arm2_uart1_data);
}

File: R13.2\kernel_imx\arch\arm\mach-mx6\board-mx6q_arm2.c
From

static void __init mx6_timer_init(void)
{
    struct clk *uart_clk;
#ifdef CONFIG_LOCAL_TIMERS
    twd_base = ioremap(LOCAL_TWD_ADDR, SZ_256);
    BUG_ON(!twd_base);
#endif
    mx6_clocks_init(32768, 24000000, 0, 0);

    uart_clk = clk_get_sys("imx-uart.0", NULL);
    early_console_setup(UART4_BASE_ADDR, uart_clk);
}

To

static void __init mx6_timer_init(void)
{
    struct clk *uart_clk;
#ifdef CONFIG_LOCAL_TIMERS
    twd_base = ioremap(LOCAL_TWD_ADDR, SZ_256);
    BUG_ON(!twd_base);
#endif
    mx6_clocks_init(32768, 24000000, 0, 0);

    uart_clk = clk_get_sys("imx-uart.0", NULL);
    early_console_setup(UART1_BASE_ADDR, uart_clk);
}

File: R13.2\kernel_imx\arch\arm\plat-mxc\include\mach\uncompress.h
（注意：对应板子的型号来搞，并不是一定根据里面的去搞）
From

    case MACH_TYPE_MX6Q_ARM2:
        uart_base = MX6Q_UART4_BASE_ADDR;
        break;
    case MACH_TYPE_MX6Q_SABRELITE:
        uart_base = MX6Q_UART2_BASE_ADDR;
        break;
    case MACH_TYPE_MX6Q_SABRESD:
        uart_base = MX6Q_UART1_BASE_ADDR;
        break;
    case MACH_TYPE_MX6Q_SABREAUTO:
        uart_base = MX6Q_UART4_BASE_ADDR;
        break;
    default:
        break;

To

    case MACH_TYPE_MX6Q_ARM2:
        uart_base = MX6Q_UART1_BASE_ADDR;
        break;
    case MACH_TYPE_MX6Q_SABRELITE:
        uart_base = MX6Q_UART2_BASE_ADDR;
        break;
    case MACH_TYPE_MX6Q_SABRESD:
        uart_base = MX6Q_UART1_BASE_ADDR;
        break;
    case MACH_TYPE_MX6Q_SABREAUTO:
        uart_base = MX6Q_UART4_BASE_ADDR;
        break;
    default:
        break