Hi, Dall: Thanks for your quick response! >It depends on the board. Which ARM doc are you referring to? ARM Security Technology : Building a Secure System using TrustZone Technology. (PRD29-GENC-009492C) Figure 5-2 in Chapter 5.2.1 Boot Sequence. Based on my understanding, U-boot is classfied as normal world boot loader. Maybe my understanding is wrong! :)
>In general, there are three options for how u-boot is booted: >1. In secure mode >2. In non-secure hyp mode >3. in non-secure svc mode >for (1) you can just switch to non-secure hyp. for (2) you don't have >to do anything. for (3) you're screwed, unless there's a backdoor >call to enter Hyp mode (typically found on TI hardware). For (1), i didn't get it totally: On a platform with a CA7 supporting TZ tech, but this SOC not support VT, usually cpu is powered on in secure mode. So, i could only switch it to non-sec state? If this CA7 also supports VT, so i could select 2 goals: Switch to non-sec state, or swith to non-sec hyp mode? I think non-sec state is not identical with non-sec hyp mode. Best wishes, -Christoffer _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
