Unable to configure ETHx_PPS_OUT on STM32MP135DAE in STM32CubeMX

[dave4444]

Hello,

I'm trying to configure a STM32MP135DAE in STM32CubeMX and running into problems trying to enable the ETHx_PPS_OUT pins in the configuration.

For both ETH1 and ETH2, the "ETH PTP_Synchro PPS_OUT" box is grayed out with an error of:

"ETH PTP_Synchro PPS_OUT Disabled: available only if one ETH Mode is enabled and if TIM2 or TIM3 is enabled with Slave Mode enabeld and ETR as Trigger Source or if FDCAN is enabled"

Attempting to enabel TIM3 as desribed is not possible. Trigger Source of ETR1 is not selectable with an error of:

"ETR1 Conflict with: SDMMC1: Mode SD 4 bits Wide bus or/and ETH! : Mode RGMII (Reduced GMII)"

This is with STMCubeMX 6.14.0

[debugging]

a bit hard to tell. There is a limit to configure many peripherals. Perhaps look at the pinmux to see if the mix of peripherals is actually possible.  Is SDMMC the SD card interface ? That could run in 1 bit mode. Perhaps change ? Always better to first use CubeMX to asses the configuration can be done, before building a schematic.

[dave4444]

I pinned the appropriate pins (PA4 and PA5) as ETH1_PPS_OUT and ETH2_PPS_OUT but it's not associating.