| Targeted Hardware | phyBOARD-Zeta (i.MX7) |
| Targeted Software | PD18.1.1 |
| Date |
|
Summary
This is a summary of the how to.
Step-by-step guide
u-boot
To change the serial console for u-boot, you'll need to modify the CONFIG_CONS_INDEX and CONFIG_MXC_UART_BASE definitions in the u-boot source.
Change CONFIG_CONS_INDEX to indicate the index of the UART that is desired. In this case, we will change it from 5 to 1:
/* allow to overwrite serial and ethaddr */ #define CONFIG_ENV_OVERWRITE #undef CONFIG_CONS_INDEX #define CONFIG_CONS_INDEX 5 #define CONFIG_BAUDRATE 115200
/* allow to overwrite serial and ethaddr */ #define CONFIG_ENV_OVERWRITE #undef CONFIG_CONS_INDEX #define CONFIG_CONS_INDEX 1 #define CONFIG_BAUDRATE 115200
Change CONFIG_MXC_UART_BASE to indicate the UART base address of the UART that is desired. In this case, we will change it from 5 to 1:
#define CONFIG_MXC_UART_BASE UART5_IPS_BASE_ADDR
#define CONFIG_MXC_UART_BASE UART1_IPS_BASE_ADDR
Verify the desired UART pins are muxed correctly in u-boot:
&uart1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart1>;
assigned-clocks = <&clks IMX7D_UART1_ROOT_SRC>;
assigned-clock-parents = <&clks IMX7D_PLL_SYS_MAIN_240M_CLK>;
status = "okay";
};
Linux
Change the SERIAL_CONSOLE to indicate the desired 'ttymxc' device in the imx7d_phyboard_zeta_001 machine configuraiton. In this case, we will change it from a 4 to a 0:
SERIAL_CONSOLE = "115200 ttymxc4"
SERIAL_CONSOLE = "115200 ttymxc0"
You'll also want to verify the desired UART pins are muxed in your device tree:
&uart1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart1>;
assigned-clocks = <&clks IMX7D_UART1_ROOT_SRC>;
assigned-clock-parents = <&clks IMX7D_PLL_SYS_MAIN_240M_CLK>;
status = "okay";
};
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