Hi,
I want to change u-boot debug console from UART1 to UART4 for imx8qm. What changes do I do ?
I applied the below changes in u-boot but it didnt work.
chosen {
bootargs = "console=ttyLP4,115200 earlycon";//
stdout-path = &lpuart4;////
};
pinctrl_lpuart4: lpuart4grp {
fsl,pins = <
SC_P_M40_GPIO0_00_DMA_UART4_RX 0x06000020
SC_P_M40_GPIO0_01_DMA_UART4_TX 0x06000020
>;
};
&lpuart4 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lpuart4>;
status = "okay";
};
#define UART_PAD_CTRL ( (SC_PAD_CONFIG_OUT_IN << PADRING_CONFIG_SHIFT) | (SC_PAD_ISO_OFF << PADRING_LPCONFIG_SHIFT) \
| (SC_PAD_28FDSOI_DSE_DV_HIGH << PADRING_DSE_SHIFT) | (SC_PAD_28FDSOI_PS_PU << PADRING_PULL_SHIFT))
static iomux_cfg_t uart4_pads[] = {
SC_P_M40_GPIO0_00 | MUX_MODE_ALT(2) | MUX_PAD_CTRL(UART_PAD_CTRL),//
SC_P_M40_GPIO0_01 | MUX_MODE_ALT(2) | MUX_PAD_CTRL(UART_PAD_CTRL),//
};
static void setup_iomux_uart(void)
{
//imx8_iomux_setup_multiple_pads(uart0_pads, ARRAY_SIZE(uart0_pads));
imx8_iomux_setup_multiple_pads(uart4_pads, ARRAY_SIZE(uart4_pads));//
}
int board_early_init_f(void)
{
sc_pm_clock_rate_t rate = SC_80MHZ;
int ret;
/* When start u-boot in XEN VM, directly return */
if (IS_ENABLED(CONFIG_XEN)) {
writel(0xF53535F5, (void __iomem *)0x80000000);
return 0;
}
/* Set UART3 clock root to 80 MHz and enable it */
ret = sc_pm_setup_uart(SC_R_UART_4, rate);
if (ret)
return ret;
setup_iomux_uart();
return 0;
}
void board_quiesce_devices(void)
{
const char *power_on_devices[] = {
"dma_lpuart4","PD_UART4_RX","PD_UART4_TX"
};
imx8_power_off_pd_devices(power_on_devices, ARRAY_SIZE(power_on_devices));
}
