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=== Secondary Bootloader ===
Because the space in the boot ROM is limited, a secondary bootloader on the eMMC is used.<ref name=":1">{{Cite journal|last1=Yuan|first1=Pengfei|last2=Guo|first2=Yao|last3=Chen|first3=Xiangqun|last4=Mei|first4=Hong|date=March 2018|title=Device-Specific Linux Kernel Optimization for Android Smartphones|url=http://dx.doi.org/10.1109/mobilecloud.2018.00018|journal=2018 6th IEEE International Conference on Mobile Cloud Computing, Services, and Engineering (MobileCloud)|pages=65–72|publisher=IEEE|doi=10.1109/mobilecloud.2018.00018|isbn=978-1-5386-4879-7|s2cid=13742883}}</ref> The secondary bootloader
On the Qualcomm MSM8960 for example, the Secondary Bootloader 1 loads the Secondary Bootloader 2. The Secondary Bootloader 2 loads TrustZone and the Secondary Bootloader 3.<ref>{{Cite book|last=Tao|first=Chen, Yue Zhang, Yulong Wang, Zhi Wei|url=http://worldcat.org/oclc/1106269801|title=Downgrade Attack on TrustZone|date=2017-07-17|oclc=1106269801}}</ref>
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