El Wed, Aug 24, 2016 at 08:58:06PM +0100, Luke Kenneth Casson Leighton deia:
... and that's where things like the TI SoCs and the Samsung Exynos SoCs fall down. you simply *cannot* undo a blown e-fuse: that's the whole point.
which is why if you were to ship a processor that *didn't* have its "secure e-fuse" blown, you're actually selling people a ticking time-bomb where the possibility exists for someone to hack in to your computer, install some spyware at the bootloader level, blow the e-fuse and then you're *really* screwed. a whole new ransomware vector at the *hardware* level. dang.
which is why i contacted TI to ask them if there was a way to blow the e-fuses so that DRM could ****NEVER**** be enabled. they were incredibly surprised: i was literally the first person ever to ask them.
oh... the answer was "no".
I didn't know that.
Does this affect all TI SoCs or only some or you just checked the one you were evaluating ?
Do you have a link to the docs ?
Thank you.