Xbox 360 Architecture: A Supercomputer for the Rest of Us by Rodrigo Copetti

Author:Rodrigo Copetti [Copetti, Rodrigo]
Language: eng
Format: epub
Tags: Nonfiction, Computers, Advanced Computing, Engineering, Computer Architecture, Application Software, Computer Graphics, Computer Science
ISBN: 9798201201050
Amazon: B0B5V8NMY3
Goodreads: 62908899
Published: 2022-06-07T16:30:00+00:00

2BL or CB: The CPU, now executing from the internal SRAM, queries the eFuses to check that the version of CB running matches the one written on the eFuses. Then, it initialises most of the hardware. Finally, the CPU proceeds to fetch another block from NAND called ‘CD’ onto main RAM and repeats similar decryption and verification tasks 1BL did, this time using another key derived from the ‘CPU key’ (stored in the eFuses). If everything goes well, the next stage proceeds. In later software updates, this process was split into two bootloaders (named CB_A and CB_B) to mitigate faults that were exploited to execute homebrew (more details in the ‘Anti-piracy’ section).

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