Hello Pankaj, On 22.02.22 05:30, Pankaj Gupta wrote: > Hi Ahmad, > > >> -----Original Message----- >> From: Matthias Schiffer <matthias.schiffer@xxxxxxxxxxxxxxx> >> Sent: Monday, December 13, 2021 7:11 PM >> To: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> >> >>> For now, this is pointed out in the documentation. If you have a >>> suggestion on a specific condition we should check and issue a >>> diagnostic on, I can incorporate it. An exhaustive if >>> WARN_ON(!secure()) is impossible, but having some warning for >>> unsuspecting users would indeed be nice. >> >> I don't know of any condition that doesn't involve looking at SoC- specific OTP >> registers - that's what U-Boot does to determine whether HAB is enabled... >> > > Check the value fetched from the SEC Status Register (SSTA) (Offset 0xFD4h, bit 8,9 => 00b - Non-Secure, 01b - Secure, 10b - Trusted, 11b - Fail), for MOO (Mode of Operation). > And the warning can be issued accordingly. > > It is to be noted that this register is part of CAAM page0, which might not be accessible to Linux, for all the iMX SoC(s). > > For other SoC(s), this can be added. Thanks for the pointer. I am only testing this with i.MX, so I'd prefer this be left as a future exercise for a Layerscape user. Thanks for your reviews. I collected them on Patches 2/5 and 4/5 for v5. Cheers, Ahmad -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
