#define SRC_ADDR                                                               \
  0x00000000 // Let's try to grab the very beginning of the EMMC/ROM
#define DEST_ADDR 0x40008000 // Safe staging area in IRAM
#define COPY_SIZE 0x2000     // 8KB chunk
#define PMC_SCRATCH0 0x7000e450

void _start() {
  unsigned int *src = (unsigned int *)SRC_ADDR;
  unsigned int *dest = (unsigned int *)DEST_ADDR;

  for (int i = 0; i < (COPY_SIZE / 4); i++) {
    dest[i] = src[i];
  }

  *(volatile unsigned int *)PMC_SCRATCH0 = 0x55AA55AA;

  while (1)
    ;
}