According to http://ift.tt/1pWseH5 : "What is eFUSE? it's a technology that allows reprogramming a read-only memory chip in real-time, even though such chips come with hard-coded code that cannot be generally changed after manufacturing. When flashing unofficial software on the device, the status of the system and KNOX is switched to CUSTOM while increasing a binary flash counter, which helps Samsung find out whether the device has been tampered with. However, while Chainfire's TriangleAway app has let users switch the status back to official and reset the flash counter until now, the KNOX status is based on eFUSE – basically, once you flash custom kernels or root the Note 3, the KNOX code gets rewritten, and this constitutes hardware damage."
According to http://ift.tt/29m16Ao : "In computing, eFUSE is a technology invented by IBM which allows for the dynamic real-time reprogramming of computer chips. Speaking abstractly, computer logic is generally "etched" or "hard-coded" onto a chip and cannot be changed after the chip has finished being manufactured. By utilizing a set of eFUSEs, a chip manufacturer can allow for the circuits on a chip to change while it is in operation. The primary application of this technology is to provide in-chip performance tuning. If certain sub-systems fail, or are taking too long to respond, or are consuming too much power, the chip can instantly change its behavior by "blowing" an eFUSE."
I'm interested in the physical method being used to set the warranty void bit. This sounds to me like there is an actual fuse of some kind on the ROM memory chip that will, what, overheat and kill itself when Knox is tripped? Maybe there is just a bit of solder somewhere that gets some current passed through it If Knox is tripped and the solder melts and this is the "rewriting" of the code mentioned in the first quote? Perhaps someone can answer this or point me at a discussion somewhere that goes into the physical methods of this particular use of an efuse.
According to http://ift.tt/29m16Ao : "In computing, eFUSE is a technology invented by IBM which allows for the dynamic real-time reprogramming of computer chips. Speaking abstractly, computer logic is generally "etched" or "hard-coded" onto a chip and cannot be changed after the chip has finished being manufactured. By utilizing a set of eFUSEs, a chip manufacturer can allow for the circuits on a chip to change while it is in operation. The primary application of this technology is to provide in-chip performance tuning. If certain sub-systems fail, or are taking too long to respond, or are consuming too much power, the chip can instantly change its behavior by "blowing" an eFUSE."
I'm interested in the physical method being used to set the warranty void bit. This sounds to me like there is an actual fuse of some kind on the ROM memory chip that will, what, overheat and kill itself when Knox is tripped? Maybe there is just a bit of solder somewhere that gets some current passed through it If Knox is tripped and the solder melts and this is the "rewriting" of the code mentioned in the first quote? Perhaps someone can answer this or point me at a discussion somewhere that goes into the physical methods of this particular use of an efuse.
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