Other point on whether OTP effuse are R/W access, after LOCK_DOWN fuse? Not sure about how "doing the LOCK_DOWN fuse"? Please elaborate more on this. >> >> - With new regulations like the EU CRA I think we need some sort of >> secure-enclave anyway. > Probably some sort of, yes. But not necessarily in the form of TEE or TrustZone, I guess. To use ELE features through Linux, there is no dependency on OPTEE-OS. >> >> - Making it optional cause more paths of potential errors e.g. by not >> including the correct "secure.dtsi". Multiple paths also require more >> maintain- and testing effort. IMHO I do think that one of the paths >> get unmaintened at some point but we would need to keep it for >> backward compatibility. >> >> Having one implementation eliminates this since. >> >> - All above points assume that the ELE-FW and -HW is capable of talking >> to both world, which is not the case. As we learned NXP doesn't have >> a fix for the 2-MUs ELE yet and even more important there are 1-MU >> ELE-IPs. For i.MX9x SoC(s) there is at least one dedicated ELE MU(s) for each world - Linux(one or more) and OPTEE-OS (one or more), that needs to be shared between them. As mentioned earlier, there is an issue of using MUs simultaneously, from both worlds. Fix is in progress. >> >> I do see the (minimal) drawback of having +1 FW but I think this is >> more an integration problem. >> Speaking of FW files, for the new i.MX9* you already have plenty fo >> them: bootloader, TF-A, ele-fw, scu-fw (i.MX95). So your integation >> needs to handle multiple firmware files already. > Sure, but I really like to keep the complexity and therefore the number of FW files as low as possible. I'm not sure what has more weight in terms of security: shipping an additional firmware and therefore increasing the attack surface or maintaining an additional code-path. There is no +1 firmware in case of i.MX93. >> >>> Anyway, I see your point of having a single implementation for the >>> ELE API in the "right" place. But as far as I know other platforms >>> like >>> STM32MP1 also implement both ways for the HWRNG, secure access via >>> OPTEE and non-secure access via kernel directly. >> >> I'm not a STM32MP1 expert but here you have this setup with the >> *-scmi.dtsi. So you have two code paths which needs to be maintained >> and tested. Also if one customer of yours want to use OP-TEE you need >> the integration anyway, so you (Kontron) needs to maintain multiple >> configuration as well. I don't see the added value. >> >> I think for STM32MP1 the *-scmi.dtsi support was added later because >> it required a lot effort to support it. This is not the case for the >> i.MX9* series. > Anyway, thanks for elaborating. Your points are all valid and basically I agree. I'm fine with either way. But I'm afraid that implementing the ELE API in OP-TEE only will cause another tremendous delay for having ELE access in the kernel, especially seeing how slow NXP seems to be working on these topics right now. 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