Hi,
I am trying to work with the USART6 which is connected to is connected to PF13 (TX) and PF14 (RX) on the extended GPIO.
It looks like the SCRIF does not allow access to this USART, wven though the OPTEE configuration seems to enable it:
from optee/...core/.../stm32mp257f-ev1-ca35tdcid-rif.stdi:
...
IFPROT(STM32MP25_RIFSC_USART6_ID, RIF_UNUSED, RIF_UNLOCK, RIF_NSEC, RIF_NPRIV, RIF_UNUSED, RIF_SEM_DIS, RIF_CFDIS)
...
but when I boot the board I can see this:
cat /sys/kernel/debug/stm32_firewall/rifsc | grep USART
| USART1 || 31 || NSEC || NPRIV || enabled || enabled || 0 || 0x0 |
| USART2 || 32 || NSEC || PRIV || enabled || disabled || 1 || 0x0 |
| USART3 || 33 || NSEC || NPRIV || enabled || enabled || 0 || 0x0 |
| USART6 || 36 || NSEC || NPRIV || enabled || disabled || 2 || 0x0 |
From what I understand it means the CID is 2 which means access to this USART can be done only from the M33 micro.
Is that correct?
How can I solve this? I am struggeling with Yocto for a while with no success.
Thanks.
