Change UART on Early Crash Console OP-TEE

[m_stoko]

Hello,

I am working on the stm32mp257f-ev1 board and attempting to switch from the default USART2 early crash console output to USART6. I've successfully switch TF-A and U-BOOT console to USART6 but my OP-TEE console continuously outputs on USART2.

I've made sure to change the serial0 alias from USART2 to USART6 in the OP-TEE device tree (as I've successfully done in the TF-A device tree) and I've also followed the directions to change the header file stm32mp2_def.h For USART6, I've changed the early crash console in stm32mp2_def.h to the following:

#define STM32MP_DEBUG_USART_BASE                    USART6_BASE
#define DEBUG_UART_TX_GPIO_BANK_ADDRESS    GPIOF_BASE
#define DEBUG_UART_TX_GPIO_BANK_CLK_REG     RCC_GPIOFCFGR
#define DEBUG_UART_TX_GPIO_BANK_CLK_EN        RCC_GPIOxCFGR_GPIOxEN
#define DEBUG_UART_TX_GPIO_PORT                       13
#define DEBUG_UART_TX_GPIO_ALTERNATE            3
#define DEBUG_UART_TX_CLKSRC_REG                   RCC_XBAR20CFGR
#define DEBUG_UART_TX_CLKSRC                             XBAR_SRC_HSI
#define DEBUG_UART_TX_EN_REG                             RCC_USART6CFGR
#define DEBUG_UART_TX_EN                                      RCC_UARTxCFGR_UARTxEN
#define DEBUG_UART_RST_REG                                 RCC_USART6CFGR
#define DEBUG_UART_RST_BIT                                   RCC_UARTxCFGR_UARTxRST
#define DEBUG_UART_PREDIV_CFGR                        RCC_PREDIV20CFGR
#define DEBUG_UART_FINDIV_CFGR                         RCC_FINDIV20CFGR

I'm still unable to get output on USART6 for OP-TEE though. Any advice would be greatly appreciated!

[PatrickF]

Hi @m_stoko 

 

did you look to https://wiki.st.com/stm32mpu/wiki/How_to_debug_OP-TEE#Debug_with_traces

and https://wiki.st.com/stm32mpu/wiki/OP-TEE_configuration_switches

e.g.

Regards.

[m_stoko]

Thank you for the info @PatrickF! 

I tried adding the configuration flag CFG_STM32_EARLY_CONSOLE_UART=6 to my local.conf but I'm still not getting any early crash console info. Am I perhaps changing the wrong device tree for OP-TEE?
For TF-A I changed stm32mp257f-ev1.dts in .../work-shared/stm32mp2/tfa-source/ and for OP-TEE I changed stm32mp257f-ev1-ca35tdcid-ostl.dts in .../work-shared/stm32mp2/external-dt/optee/.

[m_stoko]

Never mind, I just had the flag set in the wrong file. The change of flag instance was the problem; thanks!