Closed gagachang closed 4 years ago
Hello @gagachang,
Supported boards do not all expose pins that can be muxed the secure-able interfaces and not all peripheral interfaces are secure-able. For examples, only USART1 among the UARTs is secure-able: can be assigned (or not) to secure world, others are always non-secure. Check from the documentation the ETZPC support that shows which peripheral can be assigned to the secure world.
Hi @etienne-lms
Thanks, I check the peripheral assignments from their website and same as you said.
Can you help me to find out where USART1
is on the board?
I have read the user manual, it only shows that USART2
is used by Bluetooth, USART3
is used by GPIO connector.
Is USART1
used by ST-LINK/V2-1?
Thanks, this is my last question.
I think DK2 does not expose pins that can carry USART1 bus.
@etienne-lms , thanks.
Does stm32mp1 support configuring the clock in OP-TEE?
I tried to use USART3 in the OP-TEE, although it is non-secure.
I initialized and registered the USART3, the same as the OP-TEE's console does (UART4).
But the CPU stalled when I call serial functions, such as serial_usart3->ops->getchar(serial_usart3)
.
I think the reason is that linux shut down the clock of USART3 when the CPU switches to secure state.
Am I correct?
Your description makes sense. Indeed, Linux likely disables the clocks that are not used.
@etienne-lms , thank you!
Hello,
I have some questions about stm32mp1 platform, could you help me out? The board I have is STM32MP157C-DK2.
I found that there are some functions, such as
stm32mp_register_secure_periph()
instm32_util.h
. It seems that we can register some peripherals as a secure-world-only, right? If I want some I/O to be secure, such asUSART3
on GPIO expansion connectors, how can I do this?Also, I found that
USART1
is configured to be secure by default, but I didn't find out theUSART1
interface on the board.Thank you first!