SamyGO

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void start()
{
  unsigned int *ptr;
  int is_end_of_bss;
  
  sr_val = __get_CPSR() & 0xFFFFFFE0 | 0xD3;
  __asm { MSR     CPSR_cf, R0 }
  init_all();
  ptr = (unsigned int *)&timestamp;             // this is a pointer to start of bss area
  do
  {
    *ptr = 0;                                   // zero bss area
    is_end_of_bss_ZF = (char *)ptr == &bss_end;
    ++ptr;
  }
  while ( !is_end_of_bss );
  
  _sdp_mmc();                                   // loads 0x20000 bytes of bootloader to 0x47000000
  if ( !(crypto_hwreg_disabled & 1) )
  {
    crypto_hwreg_cmac_addr = 0x47000000;        // address of start of bootloader in ram
    crypto_hwreg_cmac_size1 = 0x1FFF0;          // size of bootloader to calc hash over
    crypto_hwreg_cmac_size2 = 0x1FFF0;          // size of bootloader to calc hash over
    crypto_hwreg_cmac_cmd1 = 0xC3;              // hash command?
    crypto_hwreg_cmac_hash[0] = 0x210BADD;      // hash at the end of bootloader
    crypto_hwreg_cmac_hash[1] = 0x6C767816;
    crypto_hwreg_cmac_hash[2] = 0x45EE2C72;
    crypto_hwreg_cmac_hash[3] = 0x47EDCF85;
    crypto_hwreg_cmac_cmd2 = 0x23;              // hash command?
    while ( crypto_hwreg_status )               // wait till hash calc is done?
      ;
    while ( crypto_hwreg_result != 1 )          // if hash doesnt match?, enter infinite loop
      ;
  }
  Main();                                       // start main bootloader function
}