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README

      1 0. Directory structure
      2 
      3 For ease of source browsing this directory may contain soft links to variant
      4 directories located elsewhere;
      5 build scripts fully support such layout, however this is not necessary in order
      6 to build such variants.
      7 
      8 1. HW Customization
      9 
     10 1.1 General description
     11 - wakeup-gpio has direction from Application Processor (AP) to ContextHub
     12 - irq1 has direction from ContextHub to AP (wakeup interrupt)
     13 - irq2 has direction from ContextHub to AP (non-wakeup interrupt) (optional)
     14 
     15 1.2 Kernel side
     16 - wakeup-gpio = SH_INT_WAKEUP
     17 - irq1-gpio   = AP_INT_WAKEUP
     18 - irq2-gpio   = AP_INT_NONWAKEUP
     19 
     20 1.3 ContextHub side
     21 - #define SH_INT_WAKEUP    PX(N0)
     22 - #define AP_INT_WAKEUP    PY(N1)
     23 - #define AP_INT_NONWAKEUP PZ(N2)
     24