Hello @Timo,
I was too busy to try this out again. Now I had some time to play with it, and I got the RPMsg TTY demo working.
You need this overlay enabled (as you already have it):
fdt_overlays=colibri-imx8x_hmp_overlay.dtbo
First of all, I applied the patch from NXP that I linked above to get my toolkit working.
Then I applied these changes in the pinmux files following the example for hello world:
diff --git a/boards/mekmimx8qx/multicore_examples/rpmsg_lite_str_echo_rtos/pin_mux.c b/boards/mekmimx8qx/multicore_examples/rpmsg_lite_str_echo_rtos/pin_mux.c
index 7339c00..391d914 100644
--- a/boards/mekmimx8qx/multicore_examples/rpmsg_lite_str_echo_rtos/pin_mux.c
+++ b/boards/mekmimx8qx/multicore_examples/rpmsg_lite_str_echo_rtos/pin_mux.c
@@ -70,12 +70,12 @@ void BOARD_InitPins(sc_ipc_t ipc) /*!< Function assigne
{
assert(false);
}
- err = sc_pad_set_all(ipc, BOARD_INITPINS_M40_UART0_RX_PIN_FUNCTION_ID, 1U, SC_PAD_CONFIG_NORMAL, SC_PAD_ISO_OFF, 0x0 ,SC_PAD_WAKEUP_OFF);/* IOMUXD_ADC_IN2 register modification value */
+ err = sc_pad_set_all(ipc, BOARD_INITPINS_M40_UART0_RX_PIN_FUNCTION_ID, 2U, SC_PAD_CONFIG_NORMAL, SC_PAD_ISO_OFF, 0x0 ,SC_PAD_WAKEUP_OFF);/* IOMUXD_ADC_IN2 register modification value */
if (SC_ERR_NONE != err)
{
assert(false);
}
- err = sc_pad_set_all(ipc, BOARD_INITPINS_M40_UART0_TX_PIN_FUNCTION_ID, 1U, SC_PAD_CONFIG_NORMAL, SC_PAD_ISO_OFF, 0x0 ,SC_PAD_WAKEUP_OFF);/* IOMUXD_ADC_IN3 register modification value */
+ err = sc_pad_set_all(ipc, BOARD_INITPINS_M40_UART0_TX_PIN_FUNCTION_ID, 2U, SC_PAD_CONFIG_NORMAL, SC_PAD_ISO_OFF, 0x0 ,SC_PAD_WAKEUP_OFF);/* IOMUXD_ADC_IN3 register modification value */
if (SC_ERR_NONE != err)
{
assert(false);
diff --git a/boards/mekmimx8qx/multicore_examples/rpmsg_lite_str_echo_rtos/pin_mux.h b/boards/mekmimx8qx/multicore_examples/rpmsg_lite_str_echo_rtos/pin_mux.h
index 900d8ef..def1e22 100644
--- a/boards/mekmimx8qx/multicore_examples/rpmsg_lite_str_echo_rtos/pin_mux.h
+++ b/boards/mekmimx8qx/multicore_examples/rpmsg_lite_str_echo_rtos/pin_mux.h
@@ -14,10 +14,10 @@
**********************************************************************************************************************/
/* ADC_IN2 (coord V32), M40_UART0_RX */
-#define BOARD_INITPINS_M40_UART0_RX_PIN_FUNCTION_ID SC_P_ADC_IN2 /*!< Pin function id */
+#define BOARD_INITPINS_M40_UART0_RX_PIN_FUNCTION_ID SC_P_SCU_GPIO0_00 /*!< Pin function id */
/* ADC_IN3 (coord V30), M40_UART0_TX */
-#define BOARD_INITPINS_M40_UART0_TX_PIN_FUNCTION_ID SC_P_ADC_IN3 /*!< Pin function id */
+#define BOARD_INITPINS_M40_UART0_TX_PIN_FUNCTION_ID SC_P_SCU_GPIO0_01 /*!< Pin function id */
/* ADC_IN0 (coord U35), M4_I2C0_1V8_SCL */
#define BOARD_INITPINS_M4_I2C0_1V8_SCL_PIN_FUNCTION_ID SC_P_ADC_IN0 /*!< Pin function id */
With this it should work once the imx_rpmsg_tty kernel module and RPMsg linux driver is loaded:
torizon@colibri-imx8x-14740785:~$ ls /dev/ | grep -i rpms
rpmsg_ctrl0
rpmsg_ctrl1
ttyRPMSG30
The demo example:
torizon@colibri-imx8x-14740785:~$ echo Toradex! > /dev/ttyRPMSG30
On Cortex-M UART:
Get Message From Master Side : "Toradex!" [len : 8]
Get New Line From Master Side
Let me know if this works for you!