SPI3 not working on stm32u585 but other SPI peripherals work ok (SPI1 and SPI2). No CLK output.

As described.
I am using the B-U585I-IOT02A Discovery development kit. Just testing basic SPI operation and trying to use all three SPI lines.

Using basic setup with STM Cube ID I can send data using HAL_SPITransmit over SPI1 and SPI2. Trying to do the same on SPI3 returns an error. I also do not see any signals when probing SCK and MOSI on SPI3 when using an oscilloscope.

Am I missing something here? Or is there maybe a deeper issue?

Test code (SPI3 call returns an error, due to lack of EOT flag resulting in a timeout:

Setup code (seems to be the same for each SPI instance...) generated by STMCube:

/**
* @brief SPI MSP Initialization
* This function configures the hardware resources used in this example
* hspi: SPI handle pointer
* @retval None
*/
void HAL_SPI_MspInit(SPI_HandleTypeDef* hspi)
{
 GPIO_InitTypeDef GPIO_InitStruct = {0};
 RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
 if(hspi->Instance==SPI1)
 {
 /* USER CODE BEGIN SPI1_MspInit 0 */

 /* USER CODE END SPI1_MspInit 0 */

 /** Initializes the peripherals clock
 */
 PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_SPI1;
 PeriphClkInit.Spi1ClockSelection = RCC_SPI1CLKSOURCE_SYSCLK;
 if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
 {
 Error_Handler();
 }

 /* Peripheral clock enable */
 __HAL_RCC_SPI1_CLK_ENABLE();

 __HAL_RCC_GPIOE_CLK_ENABLE();
 /**SPI1 GPIO Configuration
 PE14 ------> SPI1_MISO
 PE13 ------> SPI1_SCK
 PE15 ------> SPI1_MOSI
 */
 GPIO_InitStruct.Pin = GPIO_PIN_14|GPIO_PIN_13|GPIO_PIN_15;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
 HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);

 /* USER CODE BEGIN SPI1_MspInit 1 */

 /* USER CODE END SPI1_MspInit 1 */
 }
 else if(hspi->Instance==SPI2)
 {
 /* USER CODE BEGIN SPI2_MspInit 0 */

 /* USER CODE END SPI2_MspInit 0 */

 /** Initializes the peripherals clock
 */
 PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_SPI2;
 PeriphClkInit.Spi2ClockSelection = RCC_SPI2CLKSOURCE_SYSCLK;
 if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
 {
 Error_Handler();
 }

 /* Peripheral clock enable */
 __HAL_RCC_SPI2_CLK_ENABLE();

 __HAL_RCC_GPIOD_CLK_ENABLE();
 /**SPI2 GPIO Configuration
 PD4 ------> SPI2_MOSI
 PD3 ------> SPI2_MISO
 PD1 ------> SPI2_SCK
 */
 GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_1;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 GPIO_InitStruct.Alternate = GPIO_AF5_SPI2;
 HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

 /* USER CODE BEGIN SPI2_MspInit 1 */

 /* USER CODE END SPI2_MspInit 1 */
 }
 else if(hspi->Instance==SPI3)
 {
 /* USER CODE BEGIN SPI3_MspInit 0 */

 /* USER CODE END SPI3_MspInit 0 */

 /** Initializes the peripherals clock
 */
 PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_SPI3;
 PeriphClkInit.Spi3ClockSelection = RCC_SPI3CLKSOURCE_SYSCLK;
 if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
 {
 Error_Handler();
 }

 /* Peripheral clock enable */
 __HAL_RCC_SPI3_CLK_ENABLE();

 __HAL_RCC_GPIOG_CLK_ENABLE();
 __HAL_RCC_GPIOD_CLK_ENABLE();
 /**SPI3 GPIO Configuration
 PG9 ------> SPI3_SCK
 PD6 ------> SPI3_MOSI
 PG10 ------> SPI3_MISO
 */
 GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 GPIO_InitStruct.Alternate = GPIO_AF6_SPI3;
 HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);

 GPIO_InitStruct.Pin = GPIO_PIN_6;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 GPIO_InitStruct.Alternate = GPIO_AF5_SPI3;
 HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

 /* USER CODE BEGIN SPI3_MspInit 1 */

 /* USER CODE END SPI3_MspInit 1 */
 }

}

/* USER CODE BEGIN 2 */
 uint8_t tx_data1[] = {1, 1, 1, 1};
 HAL_StatusTypeDef status1 = HAL_ERROR;
 uint8_t tx_data2[] = {2, 2, 2, 2};
 HAL_StatusTypeDef status2 = HAL_ERROR;
 uint8_t tx_data3[] = {3, 3, 3, 3};
 HAL_StatusTypeDef status3 = HAL_ERROR;
 (void)status1;
 (void)status2;
 (void)status3;
 /* USER CODE END 2 */

 /* Infinite loop */
 /* USER CODE BEGIN WHILE */
 while (1)
 {
	 status1 = HAL_SPI_Transmit(&hspi1, tx_data1, sizeof(tx_data1), 10); // Returns ok
	 status2 = HAL_SPI_Transmit(&hspi2, tx_data2, sizeof(tx_data2), 10); // Returns ok
	 status3 = HAL_SPI_Transmit(&hspi3, tx_data3, sizeof(tx_data3), 10); //Returns error!
	 __NOP();

 /* USER CODE END WHILE */

 /* USER CODE BEGIN 3 */
 }