Possible Efuse Faker? Options

[bifnewman]

I'm no expert on this but I was trying to understand more about the IBM eFUSE and how it works and I came across an xbox 360 cpu datasheet with the eFUSE pinouts. I was thinking about how when you install 8948 and it blows eFUSES or if you have an updated CB and it would blow the eFUSES, would it be possible to take the efuse enable and the efuse vcc pinouts and wire them to a modchip and cut the tracks for the efuses and rewire them so you could send back a different signal and boot an older kernel? Would something of the sort be possible? Why or why not?

Thanks,
bifnewman

[hobosrock696]

Well I said I would not post again however.... 2BL is not the kernel its just the vm the kernel and hypervisor combine in 5BL I believe and the check for the kernel version is in 2BL so could you not just fake it in 2BL before the vm is loaded and everything is in encrypted memory?

EDIT: I am assuming it is possible to load a valid 2BL and later pair it with a valid kernel of a different version. If you cannot do that then this definitely does not work...

EDIT2: Nono I see 2BL checks the 2BL version and 4BL ensures you do not load an older kernel.

Last question then, would it be possible to pass 4BL what seems like the correct kernel to verify and then switch it out for an older kernel when its being loaded? That is what I was getting at if it was not clear. Or does it load the kernel into memory and then verify making it impossible to modify?

This post has been edited by hobosrock696: Jun 22 2011, 08:56 PM