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According to this discussion from 2025 there was an issue on i.MX 9 when both the secure and non-secure world were using their MUs at the same time to communicate with the ELE. In the discussion it was said that a fix was planned for Q3 2025. Has this fix been released? Is the fix implemented in the ELE firmware or did it need modifications to the Cortex A55 code? If it was implemented in the ELE firmware, which firmware version was the first one to contain the fix?
According to the i.MX Linux Release Notes (RN00210) there is a known ELE problem with voltage changes. What is the impact of this problem? Will the voltage glitch detector trigger even if ELE_VOLT_CHANGE_START_REQ was sent? Or will the voltage change impact the random number generator? RN00210 mentions the problem only for i.MX 93. Is the very similar i.MX 91 affected as well?
Background: We need reliable access to the ELE from within OP-TEE and can't trust Linux to behave nicely.