plugin.cpp

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#include <Arduino.h>
#include <cstring> // memcpy
 
#include <imxrt.h> // framework-arduinoteensy/cores/teensy4
#include <plugin/plugin.h>
#include <utils/etl_base64.h>
 
using namespace loader;
 
void prepare_mpu() {
  // Turn off MPU completely
  // Effect: Can execute code in stack and global storage.
  SCB_MPU_CTRL = 0;
 
  /*
  SCB_MPU_RBAR = 0x00000000 | REGION(1); // ITCM
  SCB_MPU_RASR = MEM_NOCACHE | READWRITE | SIZE_512K;
 
  SCB_MPU_RBAR = 0x20000000 | REGION(4); // DTCM
  SCB_MPU_RASR = MEM_NOCACHE | READWRITE | NOEXEC | SIZE_512K;
 
  SCB_MPU_RBAR = 0x20200000 | REGION(6); // RAM (AXI bus)
  SCB_MPU_RASR = MEM_CACHE_WBWA | READWRITE | NOEXEC | SIZE_1M;
  */
 
  // Enabling back the MPU
  // SCB_MPU_CTRL = SCB_MPU_CTRL_ENABLE;
 
  // recommended to do before and after changing MPU registers
  asm("dsb");
  asm("isb");
}