我們知道，i.MXRT1xxx家族早期型號（RT1050/RT0160/RT1020）的硬件解密外設名字叫BEE，這個外設主要是配合FlexSPI外設去實現外接串行NOR Flash在線解密XIP執行用的。而到了最近的i.MXRT1xxx新型號（RT1010/RT1170）上，BEE外設被替換成了OTFAD外設，功能不變，解密效率得到了很大提升，但客戶在使能OTFAD加密啟動時常常遇到App無法正常運行問題，這其實跟OTFAD自身的一個時鐘小限制有關（這個限制在BEE上不存在），今天痞子衡就來好好聊一聊OTFAD的這個小限制：
一、問題描述
我們以i.MXRT1010為例，從恩智浦官網下載一個SDK包（痞子衡下的是v2.9.1），隨便選擇其中一個例程，就以最簡單的 \SDK\boards\evkmimxrt1010\demo_apps\led_blinky 為例吧。編譯這個 led_blinky 工程（選擇 flexspi_nor_debug build，即XIP工程），得到可執行文件（實際bin文件大小為10KB左右），使用 NXP-MCUBootUtility 工具將可執行文件(led_blinky.out)下載進MIMXRT1010-EVK開發板中（下載時啟動模式為2'b01，啟動時切換到2'b10），可以看到板載綠色LED小燈（D25）會閃，例程是可以正常工作的。
現在讓我們嘗試使能OTFAD加密，回到芯片下載模式依然借助 NXP-MCUBootUtility 工具，將工具 Secure boot type 選項切換為 OTFAD Encrypted Image Boot，其他設置均默認（此時加密范圍是 0x60001000 - 0x60001fff，僅加密IVT等啟動頭，不含app），再次下載可執行文件(led_blinky.out)，換到芯片啟動模式復位板子，例程依舊是正常工作的，看起來OTFAD加密啟動似乎沒有問題。
讓我們再進一步，將加密范圍設置為0x60002000 - 0x60004fff，這時加密區域覆蓋到了整個app，重新按上述流程操作一遍，發現例程沒能正常工作，這時候OTFAD加密啟動出了問題，難道app區域不能被加密？那OTFAD加密還有啥意義？
app區域當然可以被加密，跟著痞子衡再做一次實驗，在 led_blinky.c 文件的 main() 函數中，我們將時鐘配置函數 BOARD_BootClockRUN() 直接注釋掉或者在鏈接文件里將其全部搞成 __ramfunc（即在芯片內部RAM里執行這部分時鐘配置代碼），這個例程僅是利用SysTick定時翻轉GPIO，因此時鐘配置代碼去掉不影響正常運行，重新編譯工程再按上面流程操作一遍，這時候例程又能正常工作了，說明加密后的app是能被OTFAD正常解密執行的。
現在的問題變成了為何OTFAD加密啟動時，BOARD_BootClockRUN() 函數不能在Flash里執行，這就是問題所在。
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