Enabling console using LPUART8 for imx93

[Robbi]

Hi team,

                 I'm trying to boot a board which uses LPUART8 as console but LPUART1 default console in i.MX93 EVK kit. So I had done the changes in u-boot dts, linux-imx dts,imx93_evk.c and imx93_evk.h.

But unable to watch serial logs and same I checked using EVK kit J1001 header pin32&33 which are ALT modes of LPUART8. This configuration also doesn't work. Please let me know the changes need to be applied and also let me know the path.

Thanks 

Robbi

[AldoG]

Hello,

Could you share the changes you have made, so I could check those are made correctly?
Also, please share the Linux version you are working with.

Best regards/Saludos,
Aldo.

[Robbi]

Thanks @AldoG ,

                          For the response, i.MX93 EVK uses LPUART1 as default console port, but as my custom board is configured for LPUART8. I need to change my console from LPUART1 to LPUART8 and check in Header J1001. For that the modifications I had done:

u-boot-imx:

1. Added lpuart8 node and disabled lpuart1 along with iomux.
2. changed "console=ttyLP7,115200 earlycon\0" \ from ttyLP0" in /configs/imx93_evk.h file.
3. Added 
   static iomux_v3_cfg_t const uart_pads[] = {
   // MX93_PAD_UART1_RXD__LPUART1_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
   // MX93_PAD_UART1_TXD__LPUART1_TX | MUX_PAD_CTRL(UART_PAD_CTRL),
       MX93_PAD_GPIO_IO13__LPUART8_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
       MX93_PAD_GPIO_IO12__LPUART8_TX | MUX_PAD_CTRL(UART_PAD_CTRL),
   }; in /imx93_evk/imx93_evk.c file.

linux-imx:

Added lpuart8 node and disabled lpuart1 along with iomux.

imx-atf:

changed IMX_LPUART_BASE  U(0x426a0000) from  U(0x44380000) in /include/platform_def.h file.

meta-fresscale:

changed SERIAL_CONSOLES = "115200;ttyLP7" in /conf/machine/imx93-11x11-lpddr4x-evk.conf which includes header /conf/machine/include/imx93-evk.inc file.

optee-os:

changed set(CFG_UART_BASE UART1_BASE) to set(CFG_UART_BASE UART8_BASE).

For more info add zip folder which contains images of changes done. Please go through it and let me know update.

Thanks

Robbi

Thanks 

Robbi

[AldoG]

Hello,

All your changes are correct, you're missing some configuration for the clock to be enabled on the peripheral, since at boot time this is not being on by default.

at /arch/arm/mach-imx/imx9/native/clock.c 
in mxc_get_clock(enum mxc_clock clk) function add:
return ccm_clk_root_get_rate(LPUART8_CLK_ROOT);

in void init_uart_clk(u32 index) function add:
case LPUART8_CLK_ROOT:
 /* 24M */
 ccm_lpcg_on(CCGR_URT8, false);
 ccm_clk_root_cfg(LPUART8_CLK_ROOT, OSC_24M_CLK, 1);
 ccm_lpcg_on(CCGR_URT8, true);
 break;

Also at /board/freescale/imx93_evk/imx93_evk.c
in function int board_early_init_f(void) add:
init_uart_clk(LPUART8_CLK_ROOT);

This changes have been made and tested by a colleague and are working correctly on the EVK.

Best regards/Saludos,
Aldo.

[Robbi]

Thanks @AldoG ,

                          It is working now. Is i.mx93 Image compactible for imx91.

Thanks

Robbi.

[AldoG]

Hello,

Glad that it is working now, regarding image compatibility I would say no, since even if the processor is practically a downgrade of the other it would require to create your own image for the i.MX91 but you may reuse almost all of your changes.

Best regards/Saludos,
Aldo.

[Robbi]

Please help on this issue modified all paths.