secure boot基本概念和框架

http://www.chinaaet.com/article/3000153480
https://zhuanlan.zhihu.com/p/540171344

• Trust Zone
  https://www.cnblogs.com/schips/p/trust-zone_in_qualcomm.html

• FIT Image
  http://www.chinaaet.com/article/3000153127
  https://blog.csdn.net/ee230/article/details/53318027

• OP-TEE
  https://blog.csdn.net/xy010902100449/article/details/124551205
  https://zhuanlan.zhihu.com/p/553490159
  https://zhuanlan.zhihu.com/p/556039631

• ATF(ARM Trusted Firmware)
  https://www.cnblogs.com/arnoldlu/p/14175126.html
  https://blog.csdn.net/yangguoyu8023/article/details/121281700
  https://blog.csdn.net/weixin_45264425/article/details/126634277

  uboot程序仅仅是ATF架构中BL33中的一部分